diff --git a/domain/modelling/contingencies.py b/domain/modelling/contingencies.py
index b4308ed6..464d72bf 100644
--- a/domain/modelling/contingencies.py
+++ b/domain/modelling/contingencies.py
@@ -20,6 +20,9 @@ _CONTINGENCY_RATES: dict[str, float] = {
     "low_energy_lighting": 0.26,
     "high_heat_retention_storage_heaters": 0.10,
     "air_source_heat_pump": 0.25,
+    "gas_boiler_upgrade": 0.26,
+    "system_tune_up": 0.15,
+    "system_tune_up_zoned": 0.15,
     "solar_pv": 0.15,
 }
 
diff --git a/domain/modelling/generators/heating_recommendation.py b/domain/modelling/generators/heating_recommendation.py
index 1c851541..2a6e908a 100644
--- a/domain/modelling/generators/heating_recommendation.py
+++ b/domain/modelling/generators/heating_recommendation.py
@@ -27,6 +27,9 @@ _HEATING_SURFACE = "Heating & Hot Water"
 
 _HHR_STORAGE_MEASURE_TYPE = MeasureType.HIGH_HEAT_RETENTION_STORAGE_HEATERS
 _ASHP_MEASURE_TYPE = MeasureType.AIR_SOURCE_HEAT_PUMP
+_GAS_BOILER_UPGRADE_MEASURE_TYPE = MeasureType.GAS_BOILER_UPGRADE
+_SYSTEM_TUNE_UP_MEASURE_TYPE = MeasureType.SYSTEM_TUNE_UP
+_SYSTEM_TUNE_UP_ZONED_MEASURE_TYPE = MeasureType.SYSTEM_TUNE_UP_ZONED
 
 # Electricity main-fuel code (Elmhurst → SAP10 Table 12).
 _ELECTRICITY_FUEL = 30
@@ -111,6 +114,78 @@ _ASHP_OVERLAY = HeatingOverlay(
 )
 
 
+# --- Gas boiler upgrade (Heating/HW expansion): replace an existing wet boiler
+# with a modern gas condensing boiler. Validated against Elmhurst before/after
+# re-lodgements (cert 001431): the upgrade always targets mains gas — gas->gas
+# directly, and a non-gas wet boiler (oil/LPG/solid) ->gas ONLY where a mains-gas
+# connection is present (electric boilers are left alone; electrification is the
+# national target). The end-state is a Table 4b SAP code (not a PCDB index): code
+# 102 for a regular boiler heating a hot-water cylinder, code 104 for a combi
+# (no cylinder, a later slice). The calculator derives the condensing-boiler
+# seasonal efficiency from the code, so no efficiency input is needed. ---
+
+# Mains-gas main/water fuel code (Elmhurst -> SAP10 Table 12).
+_MAINS_GAS_FUEL = 26
+# Table 4a heat-emitter code for radiators (the wet-distribution end-state).
+_RADIATOR_EMITTER = 1
+# Table 4b SAP main-heating codes for the new gas condensing boiler: code 102
+# for a regular boiler heating a cylinder, code 104 for a combi (no cylinder).
+_REGULAR_GAS_BOILER_SAP_CODE = 102
+_COMBI_GAS_BOILER_SAP_CODE = 104
+# Water-heating code 901 — hot water from the main heating system.
+_WATER_FROM_MAIN_SYSTEM_CODE = 901
+# Elmhurst boiler flue type for the new condensing boiler (room-sealed/balanced);
+# every relodged after lodges type 2. SAP-inert, written for end-state fidelity.
+_CONDENSING_BOILER_FLUE_TYPE = 2
+
+# Controls upgrade (SAP 10.2 Table 4e Group 1, PDF p.172): bring an inadequate
+# boiler control up to full programmer + room thermostat + TRVs (code 2106).
+# "Inadequate" = the Group-1 codes whose description carries NO room thermostat
+# (2101 no control, 2102 programmer-only, 2107/2108/2109 programmer+TRVs without
+# a room thermostat, 2111 TRVs and bypass) — these lack boiler interlock (Table
+# 4c(2) / footnote c)), so adding a room thermostat is a genuine improvement.
+# Controls with a room thermostat (2103/2104/2105/2106/2113) or better time-and-
+# temperature zone control (2110/2112) are left unchanged — never downgraded.
+_FULL_BOILER_CONTROL = 2106
+_INADEQUATE_BOILER_CONTROL_CODES: frozenset[int] = frozenset(
+    {2101, 2102, 2107, 2108, 2109, 2111}
+)
+
+# System tune-up control end-states (SAP 10.2 Table 4e Group 1): the two best
+# competing control upgrades offered while KEEPING the existing boiler —
+# "standard" (programmer + room thermostat + TRVs, code 2106) and "zone"
+# (time-and-temperature zone control, code 2110, type 3). Zone gives more SAP
+# uplift for more cost, so the Optimiser steps to it when its extra SAP is
+# needed (ADR-0024).
+_STANDARD_CONTROL = _FULL_BOILER_CONTROL  # 2106
+_ZONE_CONTROL = 2110
+# Controls already providing standard (2106) or better — a standard tune-up
+# would be a no-op or a downgrade, so it is not offered to these.
+_STANDARD_OR_BETTER_CONTROL_CODES: frozenset[int] = frozenset({2106, 2110, 2112})
+# Controls already providing zone control (type 3) — a zone tune-up is not
+# offered to these.
+_ZONE_CONTROL_CODES: frozenset[int] = frozenset({2110, 2112})
+
+# Wet-boiler SAP main_heating_code ranges (SAP 10.2 Table 4a + 4b): gas/oil
+# boilers 101-141, solid-fuel boilers 151-161, electric boilers 191-196 (held
+# locally so the generator does not depend on the calculator's internals,
+# mirroring `domain/sap10_calculator/rdsap/cert_to_inputs.py`). Electric boilers
+# are a wet system but are deliberately not upgraded to gas.
+_WET_BOILER_SAP_CODE_RANGES: tuple[range, ...] = (
+    range(101, 142),
+    range(151, 162),
+    range(191, 197),
+)
+_ELECTRIC_BOILER_SAP_CODE_RANGE = range(191, 197)
+
+# Cylinder jacket end-state (from the after-cert): an 80 mm jacket
+# (`cylinder_insulation_type=2`). The jacket is added only when the existing
+# cylinder is below this thickness — bringing every cylinder up to 80 mm and
+# never downgrading a better-insulated one.
+_CYLINDER_JACKET_INSULATION_TYPE = 2
+_MIN_CYLINDER_INSULATION_MM = 80
+
+
 # --- ASHP cost interpretation (ADR-0025): read the dwelling into the typed
 # inputs the catalogue math needs. The modelling-layer half of the split; the
 # pricing itself lives on `Products`. ---
@@ -201,11 +276,230 @@ def recommend_heating(
     if ashp_option is not None:
         options.append(ashp_option)
 
+    boiler_option = _boiler_upgrade_option(epc, products)
+    if boiler_option is not None:
+        options.append(boiler_option)
+
+    options.extend(_system_tune_up_options(epc, products))
+
     if not options:
         return None
     return Recommendation(surface=_HEATING_SURFACE, options=tuple(options))
 
 
+def _system_tune_up_options(
+    epc: EpcPropertyData, products: ProductRepository
+) -> list[MeasureOption]:
+    """The system tune-up options: keep the existing wet boiler but install
+    better heating controls (standard 2106 and/or zone 2110, as competing
+    options) and fix the cylinder (jacket when under-insulated, thermostat when
+    absent). Each control option is offered only when it genuinely improves the
+    existing controls — never a downgrade or a no-op (ADR-0024)."""
+    main: MainHeatingDetail = epc.sap_heating.main_heating_details[0]
+    code: Optional[int] = main.sap_main_heating_code
+    if code is None or not any(code in r for r in _WET_BOILER_SAP_CODE_RANGES):
+        return []
+    control = main.main_heating_control
+    control_code: Optional[int] = control if isinstance(control, int) else None
+
+    options: list[MeasureOption] = []
+    if control_code not in _STANDARD_OR_BETTER_CONTROL_CODES:
+        options.append(
+            _tune_up_option(
+                epc,
+                products,
+                measure_type=_SYSTEM_TUNE_UP_MEASURE_TYPE,
+                control=_STANDARD_CONTROL,
+                description=(
+                    "Tune up the heating: install a programmer, room thermostat "
+                    "and TRVs and insulate and thermostat the hot-water cylinder"
+                ),
+            )
+        )
+    if control_code not in _ZONE_CONTROL_CODES:
+        options.append(
+            _tune_up_option(
+                epc,
+                products,
+                measure_type=_SYSTEM_TUNE_UP_ZONED_MEASURE_TYPE,
+                control=_ZONE_CONTROL,
+                description=(
+                    "Tune up the heating: install time-and-temperature zone "
+                    "control and insulate and thermostat the hot-water cylinder"
+                ),
+            )
+        )
+    return options
+
+
+def _tune_up_option(
+    epc: EpcPropertyData,
+    products: ProductRepository,
+    *,
+    measure_type: MeasureType,
+    control: int,
+    description: str,
+) -> MeasureOption:
+    """One tune-up Option: the existing boiler is kept; only the heating control
+    and the conditional cylinder fixes change."""
+    product = products.get(measure_type)
+    return MeasureOption(
+        measure_type=measure_type,
+        description=description,
+        overlay=EpcSimulation(heating=_tune_up_overlay(epc, control)),
+        cost=Cost(
+            total=product.unit_cost_per_m2, contingency_rate=product.contingency_rate
+        ),
+        material_id=product.id,
+    )
+
+
+def _tune_up_overlay(epc: EpcPropertyData, control: int) -> HeatingOverlay:
+    """Build a tune-up end-state: set the heating control to ``control`` and
+    apply the conditional cylinder fixes (an 80 mm jacket when under-insulated, a
+    thermostat when absent) — only when the dwelling has a cylinder. The boiler,
+    fuel and meter are left unchanged (the boiler is kept)."""
+    sap_heating = epc.sap_heating
+    jacket_type: Optional[int] = None
+    jacket_thickness_mm: Optional[int] = None
+    thermostat: Optional[str] = None
+    if epc.has_hot_water_cylinder:
+        if _cylinder_under_insulated(sap_heating.cylinder_insulation_thickness_mm):
+            jacket_type = _CYLINDER_JACKET_INSULATION_TYPE
+            jacket_thickness_mm = _MIN_CYLINDER_INSULATION_MM
+        if sap_heating.cylinder_thermostat != "Y":
+            thermostat = "Y"
+    return HeatingOverlay(
+        main_heating_control=control,
+        cylinder_insulation_type=jacket_type,
+        cylinder_insulation_thickness_mm=jacket_thickness_mm,
+        cylinder_thermostat=thermostat,
+    )
+
+
+def _boiler_upgrade_option(
+    epc: EpcPropertyData, products: ProductRepository
+) -> Optional[MeasureOption]:
+    """The gas-condensing-boiler upgrade for a dwelling with an existing wet
+    boiler: a combi (Table 4b code 104) where there is no cylinder, or a regular
+    boiler (code 102) heating the existing cylinder where there is one. Both
+    upgrade inadequate controls and the cylinder variant adds the conditional
+    cylinder fixes (a jacket when under-insulated, a thermostat when absent). One
+    Option per dwelling — a dwelling has a cylinder or it does not — offered only
+    where a mains-gas connection makes the gas end-state installable (ADR-0024
+    revised)."""
+    if not _boiler_upgrade_eligible(epc):
+        return None
+    has_cylinder: bool = epc.has_hot_water_cylinder
+    overlay: HeatingOverlay = (
+        _boiler_cylinder_overlay(epc) if has_cylinder else _boiler_combi_overlay(epc)
+    )
+    description: str = (
+        "Replace the boiler with a gas condensing boiler and insulate and "
+        "thermostat the hot-water cylinder"
+        if has_cylinder
+        else "Replace the boiler with a gas condensing combi boiler"
+    )
+    product = products.get(_GAS_BOILER_UPGRADE_MEASURE_TYPE)
+    return MeasureOption(
+        measure_type=_GAS_BOILER_UPGRADE_MEASURE_TYPE,
+        description=description,
+        overlay=EpcSimulation(heating=overlay),
+        cost=Cost(
+            total=product.unit_cost_per_m2, contingency_rate=product.contingency_rate
+        ),
+        material_id=product.id,
+    )
+
+
+def _boiler_upgrade_eligible(epc: EpcPropertyData) -> bool:
+    """Whether a dwelling's existing wet boiler can be upgraded to a gas
+    condensing boiler. The gas end-state is installable only with a mains-gas
+    connection, so gas dwellings always qualify and a non-gas wet boiler
+    (oil/LPG/solid) qualifies only where mains gas is present. Electric boilers
+    are left alone — electrification, not a gas swap, is their upgrade path."""
+    main: MainHeatingDetail = epc.sap_heating.main_heating_details[0]
+    code: Optional[int] = main.sap_main_heating_code
+    if code is None:
+        return False
+    if not any(code in r for r in _WET_BOILER_SAP_CODE_RANGES):
+        return False
+    if code in _ELECTRIC_BOILER_SAP_CODE_RANGE:
+        return False
+    return epc.sap_energy_source.mains_gas
+
+
+def _boiler_combi_overlay(epc: EpcPropertyData) -> HeatingOverlay:
+    """Build the per-dwelling combi end-state: a gas condensing combi (Table 4b
+    code 104, fanned flue) on radiators with hot water from the boiler, plus a
+    controls upgrade when the existing controls are inadequate. No cylinder, so
+    no cylinder fields are touched."""
+    main: MainHeatingDetail = epc.sap_heating.main_heating_details[0]
+    return HeatingOverlay(
+        main_fuel_type=_MAINS_GAS_FUEL,
+        heat_emitter_type=_RADIATOR_EMITTER,
+        sap_main_heating_code=_COMBI_GAS_BOILER_SAP_CODE,
+        fan_flue_present=True,
+        boiler_flue_type=_CONDENSING_BOILER_FLUE_TYPE,
+        main_heating_control=_upgraded_boiler_control(main),
+        water_heating_code=_WATER_FROM_MAIN_SYSTEM_CODE,
+        water_heating_fuel=_MAINS_GAS_FUEL,
+    )
+
+
+def _boiler_cylinder_overlay(epc: EpcPropertyData) -> HeatingOverlay:
+    """Build the per-dwelling boiler-with-cylinder end-state: a regular gas
+    condensing boiler on radiators, hot water from the main system, a controls
+    upgrade when the existing controls are inadequate, and the conditional
+    cylinder fixes — an 80 mm jacket only when the cylinder is under-insulated, a
+    thermostat only when one is absent. The existing cylinder size and meter are
+    left unchanged."""
+    sap_heating = epc.sap_heating
+    main: MainHeatingDetail = sap_heating.main_heating_details[0]
+    jacket_type: Optional[int] = None
+    jacket_thickness_mm: Optional[int] = None
+    if _cylinder_under_insulated(sap_heating.cylinder_insulation_thickness_mm):
+        jacket_type = _CYLINDER_JACKET_INSULATION_TYPE
+        jacket_thickness_mm = _MIN_CYLINDER_INSULATION_MM
+    thermostat: Optional[str] = (
+        "Y" if sap_heating.cylinder_thermostat != "Y" else None
+    )
+    return HeatingOverlay(
+        main_fuel_type=_MAINS_GAS_FUEL,
+        heat_emitter_type=_RADIATOR_EMITTER,
+        sap_main_heating_code=_REGULAR_GAS_BOILER_SAP_CODE,
+        fan_flue_present=True,
+        boiler_flue_type=_CONDENSING_BOILER_FLUE_TYPE,
+        main_heating_control=_upgraded_boiler_control(main),
+        water_heating_code=_WATER_FROM_MAIN_SYSTEM_CODE,
+        water_heating_fuel=_MAINS_GAS_FUEL,
+        cylinder_insulation_type=jacket_type,
+        cylinder_insulation_thickness_mm=jacket_thickness_mm,
+        cylinder_thermostat=thermostat,
+        has_hot_water_cylinder=True,
+    )
+
+
+def _cylinder_under_insulated(thickness_mm: Optional[int]) -> bool:
+    """Whether a hot-water cylinder is below the 80 mm jacket end-state (an
+    un-jacketed cylinder lodges no thickness)."""
+    return thickness_mm is None or thickness_mm < _MIN_CYLINDER_INSULATION_MM
+
+
+def _upgraded_boiler_control(main: MainHeatingDetail) -> Optional[int]:
+    """The full-controls code (2106) when the existing boiler control is
+    inadequate (lacks a room thermostat — SAP 10.2 Table 4e Group 1), else
+    ``None`` to leave a room-thermostatted or better control unchanged. So the
+    overlay only ever moves controls where it genuinely improves them."""
+    control = main.main_heating_control
+    code: Optional[int] = control if isinstance(control, int) else None
+    if code is None and isinstance(control, str) and control.isdigit():
+        code = int(control)
+    if code in _INADEQUATE_BOILER_CONTROL_CODES:
+        return _FULL_BOILER_CONTROL
+    return None
+
+
 def _ashp_option(
     epc: EpcPropertyData,
     products: ProductRepository,
diff --git a/domain/modelling/measure_type.py b/domain/modelling/measure_type.py
index d28bff39..70a52c90 100644
--- a/domain/modelling/measure_type.py
+++ b/domain/modelling/measure_type.py
@@ -32,4 +32,7 @@ class MeasureType(StrEnum):
     MECHANICAL_VENTILATION = "mechanical_ventilation"
     HIGH_HEAT_RETENTION_STORAGE_HEATERS = "high_heat_retention_storage_heaters"
     AIR_SOURCE_HEAT_PUMP = "air_source_heat_pump"
+    GAS_BOILER_UPGRADE = "gas_boiler_upgrade"
+    SYSTEM_TUNE_UP = "system_tune_up"
+    SYSTEM_TUNE_UP_ZONED = "system_tune_up_zoned"
     SOLAR_PV = "solar_pv"
diff --git a/domain/modelling/scoring/overlay_applicator.py b/domain/modelling/scoring/overlay_applicator.py
index 60caed17..f15ff102 100644
--- a/domain/modelling/scoring/overlay_applicator.py
+++ b/domain/modelling/scoring/overlay_applicator.py
@@ -70,6 +70,8 @@ _MAIN_HEATING_FIELDS: tuple[str, ...] = (
     "sap_main_heating_code",
     "main_heating_index_number",
     "main_heating_category",
+    "fan_flue_present",
+    "boiler_flue_type",
 )
 _SAP_HEATING_FIELDS: tuple[str, ...] = (
     "water_heating_code",
diff --git a/domain/modelling/simulation.py b/domain/modelling/simulation.py
index 8fdb1205..abf192e9 100644
--- a/domain/modelling/simulation.py
+++ b/domain/modelling/simulation.py
@@ -118,6 +118,14 @@ class HeatingOverlay:
     sap_main_heating_code: Optional[int] = None
     main_heating_index_number: Optional[int] = None
     main_heating_category: Optional[int] = None
+    # A modern condensing boiler has a fanned (room-sealed) flue; the boiler
+    # upgrade sets this True (SAP 10.2 Table 4f flue-fan electricity + the
+    # Table 4b condensing-boiler seasonal-efficiency basis depend on it).
+    fan_flue_present: Optional[bool] = None
+    # The boiler's flue type (Elmhurst enum) — a new condensing boiler lodges
+    # type 2 (room-sealed/balanced). SAP-inert, but written for fidelity so the
+    # end-state matches the installed boiler.
+    boiler_flue_type: Optional[int] = None
     # sap_heating (top-level)
     water_heating_code: Optional[int] = None
     water_heating_fuel: Optional[int] = None
diff --git a/harness/report.py b/harness/report.py
index c93f0d02..632c2b30 100644
--- a/harness/report.py
+++ b/harness/report.py
@@ -153,6 +153,29 @@ def _triggers_for(epc: EpcPropertyData, measure_type: str) -> dict[str, Any]:
                 epc.sap_heating.main_heating_details[0].main_heating_category
             ),
         }
+    if measure_type == "gas_boiler_upgrade":
+        # heating_recommendation.py offers a gas condensing boiler to a dwelling
+        # with an existing (non-electric) wet boiler and a mains-gas connection;
+        # the cylinder presence shapes it (combi vs regular + cylinder fixes).
+        return {
+            "sap_main_heating_code": (
+                epc.sap_heating.main_heating_details[0].sap_main_heating_code
+            ),
+            "mains_gas": epc.sap_energy_source.mains_gas,
+            "has_hot_water_cylinder": epc.has_hot_water_cylinder,
+        }
+    if measure_type in ("system_tune_up", "system_tune_up_zoned"):
+        # heating_recommendation.py offers a tune-up (keep the boiler, upgrade
+        # the controls + fix the cylinder) to a wet-boiler dwelling whose
+        # existing control can still be improved.
+        return {
+            "sap_main_heating_code": (
+                epc.sap_heating.main_heating_details[0].sap_main_heating_code
+            ),
+            "main_heating_control": (
+                epc.sap_heating.main_heating_details[0].main_heating_control
+            ),
+        }
     return {}
 
 
diff --git a/harness/sample_catalogue.json b/harness/sample_catalogue.json
index ef21d58f..02eb24eb 100644
--- a/harness/sample_catalogue.json
+++ b/harness/sample_catalogue.json
@@ -13,5 +13,8 @@
   "low_energy_lighting": { "unit_cost_per_m2": 8.0 },
   "high_heat_retention_storage_heaters": { "unit_cost_per_m2": 3500.0 },
   "air_source_heat_pump": { "unit_cost_per_m2": 12000.0 },
+  "gas_boiler_upgrade": { "unit_cost_per_m2": 3000.0 },
+  "system_tune_up": { "unit_cost_per_m2": 500.0 },
+  "system_tune_up_zoned": { "unit_cost_per_m2": 900.0 },
   "solar_pv": { "unit_cost_per_m2": 0.0 }
 }
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diff --git a/tests/domain/modelling/test_elmhurst_cascade_pins.py b/tests/domain/modelling/test_elmhurst_cascade_pins.py
index 77981ab2..a124c5c4 100644
--- a/tests/domain/modelling/test_elmhurst_cascade_pins.py
+++ b/tests/domain/modelling/test_elmhurst_cascade_pins.py
@@ -755,6 +755,185 @@ def test_gas_boiler_instant_hw_before_baselines() -> None:
     assert result.sap_score_continuous > 0.0
 
 
+def test_boiler_with_cylinder_overlay_reproduces_the_relodged_after() -> None:
+    # Arrange — a mains-gas wet boiler (SAP code 114) heating an uninsulated
+    # hot-water cylinder (no insulation, no thermostat) re-lodged as a new gas
+    # condensing boiler with a cylinder (SAP code 102, fanned flue), the cylinder
+    # jacketed (insulation type 2 / 80 mm) and given a thermostat. The boiler
+    # upgrade leaves the (already adequate) controls + cylinder size + meter
+    # unchanged. Validates the boiler-with-cylinder option end-state at delta 0.
+    #
+    # NB the absolute SAP on this dwelling is subject to a separate Summary-path
+    # mapper roof-fidelity gap (our calculator reads the roof better-insulated
+    # than Elmhurst, so it scores ~75 where Elmhurst prints 56); the gap is
+    # identical on before + after (the boiler measure never touches the roof), so
+    # it cancels and this pin still proves the overlay applies Elmhurst's exact
+    # heating field-delta. Tracked on the calculator branch, not here.
+    before: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_gas_001431_before.pdf"
+    )
+    after: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_gas_001431_after.pdf"
+    )
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
+def test_boiler_combi_overlay_reproduces_the_relodged_after() -> None:
+    # Arrange — a mains-gas combi (SAP code 112, no cylinder) with inadequate
+    # controls (2111 "TRVs and bypass" — no room thermostat, so no boiler
+    # interlock) re-lodged as a new gas condensing combi (code 104, fanned flue)
+    # with full programmer + room thermostat + TRV controls (2106). No cylinder,
+    # so no cylinder components. Validates the combi end-state + the controls-
+    # when-inadequate upgrade at delta 0. (Same Summary-path roof gap as the
+    # with-cylinder pin — it cancels across before/after.)
+    before: EpcPropertyData = parse_recommendation_summary(
+        "boiler_combi_gas_001431_before.pdf"
+    )
+    after: EpcPropertyData = parse_recommendation_summary(
+        "boiler_combi_gas_001431_after.pdf"
+    )
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
+def test_oil_combi_overlay_reproduces_the_relodged_after() -> None:
+    # Arrange — an OIL combi (fuel 28, SAP code 130, no cylinder) on a mains-gas
+    # street re-lodged as a gas condensing combi (fuel 28->26, code 104, fanned
+    # flue). Validates the non-gas -> gas conversion: the upgrade targets gas
+    # because a mains-gas connection is present (ADR-0024 revised). Controls are
+    # already adequate (2106), so they are unchanged.
+    before: EpcPropertyData = parse_recommendation_summary(
+        "boiler_combi_oil_001431_before.pdf"
+    )
+    after: EpcPropertyData = parse_recommendation_summary(
+        "boiler_combi_oil_001431_after.pdf"
+    )
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
+def test_boiler_with_already_insulated_cylinder_overlay_reproduces_the_relodged_after() -> None:
+    # Arrange — a gas boiler heating an ALREADY-jacketed cylinder (insulation
+    # type 2 / 80 mm) with no thermostat, re-lodged as a new gas condensing
+    # boiler (code 102) with a cylinder thermostat added. Validates the cylinder
+    # path's skip-jacket branch (the 80 mm jacket is not re-applied) while the
+    # thermostat is still added. (Sourced from an LPG re-lodgement; the Summary
+    # mapper reads its fuel as mains gas — fuel 26 — so this exercises the gas
+    # cylinder path, not a true LPG conversion. The LPG fuel-mapping gap is a
+    # separate mapper-front concern.)
+    before: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_lpg_001431_before.pdf"
+    )
+    after: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_lpg_001431_after.pdf"
+    )
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
+def test_coal_boiler_with_cylinder_overlay_reproduces_the_relodged_after() -> None:
+    # Arrange — a SOLID-FUEL (coal) boiler (fuel 11, SAP code 153) heating a
+    # cylinder, on a mains-gas street, re-lodged as a gas condensing boiler
+    # (fuel 11->26, code 102, fanned flue + boiler flue type 2). Exercises the
+    # non-gas -> gas conversion for a solid-fuel boiler AND the new
+    # `boiler_flue_type` end-state (coal's before lodged none; every other cert
+    # already lodged flue type 2). The cylinder is already 80 mm insulated so the
+    # jacket is skipped; only the thermostat is added.
+    #
+    # The relodged after predates the user-locked "always add a cylinder
+    # thermostat when absent" rule, so it stale-lodged thermostat 'N'; the test
+    # corrects it to the rule's end-state 'Y' (the same correction the gas
+    # with-cylinder after received by re-lodging). Controls are already adequate
+    # (2106), so they are unchanged.
+    before: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_coal_001431_before.pdf"
+    )
+    after: EpcPropertyData = parse_recommendation_summary(
+        "boiler_cyl_coal_001431_after.pdf"
+    )
+    after.sap_heating.cylinder_thermostat = "Y"
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
+@pytest.mark.parametrize(
+    "before_fixture, after_fixture, measure_type",
+    [
+        # The system tune-up keeps the existing boiler and forces the heating
+        # controls to a fixed end-state (standard 2106 / zone 2110) ABSOLUTELY —
+        # proven by reproducing each common after from two different starting
+        # controls (2101 "no control" and 2113 "room thermostat and TRVs") — plus
+        # the conditional cylinder jacket + thermostat (both befores are
+        # uninsulated / un-thermostatted, so both fire).
+        (
+            "tune_up_from_2101_001431_before.pdf",
+            "tune_up_standard_001431_after.pdf",
+            "system_tune_up",
+        ),
+        (
+            "tune_up_from_2113_001431_before.pdf",
+            "tune_up_standard_001431_after.pdf",
+            "system_tune_up",
+        ),
+        (
+            "tune_up_from_2101_001431_before.pdf",
+            "tune_up_zoned_001431_after.pdf",
+            "system_tune_up_zoned",
+        ),
+        (
+            "tune_up_from_2113_001431_before.pdf",
+            "tune_up_zoned_001431_after.pdf",
+            "system_tune_up_zoned",
+        ),
+    ],
+)
+def test_system_tune_up_overlay_reproduces_the_relodged_after(
+    before_fixture: str, after_fixture: str, measure_type: str
+) -> None:
+    # Arrange
+    before: EpcPropertyData = parse_recommendation_summary(before_fixture)
+    after: EpcPropertyData = parse_recommendation_summary(after_fixture)
+    recommendation: Recommendation | None = recommend_heating(before, _AnyProduct())
+    assert recommendation is not None
+    option = next(
+        o for o in recommendation.options if o.measure_type == measure_type
+    )
+
+    # Act / Assert
+    _assert_overlay_reproduces_after(before, after, option.overlay)
+
+
 # --- Solar PV cascade pins (ADR-0026) -------------------------------------
 #
 # The solar before/after Summaries lodge *synthetic* PV arrays (each 1.00 kWp,
diff --git a/tests/domain/modelling/test_heating_recommendation.py b/tests/domain/modelling/test_heating_recommendation.py
index 9a0cf285..b0f86edf 100644
--- a/tests/domain/modelling/test_heating_recommendation.py
+++ b/tests/domain/modelling/test_heating_recommendation.py
@@ -250,3 +250,229 @@ def test_existing_heat_pump_yields_no_ashp_bundle() -> None:
         assert "air_source_heat_pump" not in {
             o.measure_type for o in recommendation.options
         }
+
+
+# --- Gas boiler upgrade (Heating/HW expansion) ----------------------------
+
+
+def _gas_boiler_with_cylinder_baseline() -> EpcPropertyData:
+    """A mains-gas wet boiler (Table 4b code 114) heating an uninsulated, un-
+    thermostatted hot-water cylinder — the boiler-with-cylinder dwelling."""
+    return parse_recommendation_summary("boiler_cyl_gas_001431_before.pdf")
+
+
+def test_gas_boiler_with_cylinder_dwelling_yields_a_boiler_upgrade_bundle() -> None:
+    # Arrange — a mains-gas wet boiler with an uninsulated, un-thermostatted
+    # cylinder: the upgrade fires both conditional cylinder fixes.
+    baseline: EpcPropertyData = _gas_boiler_with_cylinder_baseline()
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert — the absolute boiler end-state (code 102, fanned flue) with the
+    # cylinder jacketed (type 2 / 80 mm) and thermostatted; controls, cylinder
+    # size, and meter are left unchanged.
+    assert recommendation is not None
+    options = {o.measure_type.value: o for o in recommendation.options}
+    assert "gas_boiler_upgrade" in options
+    assert options["gas_boiler_upgrade"].overlay.heating == HeatingOverlay(
+        main_fuel_type=26,
+        heat_emitter_type=1,
+        sap_main_heating_code=102,
+        fan_flue_present=True,
+        boiler_flue_type=2,
+        water_heating_code=901,
+        water_heating_fuel=26,
+        cylinder_insulation_type=2,
+        cylinder_insulation_thickness_mm=80,
+        cylinder_thermostat="Y",
+        has_hot_water_cylinder=True,
+    )
+
+
+def test_boiler_upgrade_skips_jacket_when_cylinder_already_insulated() -> None:
+    # Arrange — the same dwelling but with an already well-insulated cylinder
+    # (100 mm > the 80 mm jacket end-state): the jacket must not be re-applied
+    # (and must never downgrade it).
+    baseline: EpcPropertyData = _gas_boiler_with_cylinder_baseline()
+    baseline.sap_heating.cylinder_insulation_thickness_mm = 100
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert — no jacket fields, but the thermostat still added (absent before).
+    assert recommendation is not None
+    overlay = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    ).overlay.heating
+    assert overlay is not None
+    assert overlay.cylinder_insulation_type is None
+    assert overlay.cylinder_insulation_thickness_mm is None
+    assert overlay.cylinder_thermostat == "Y"
+
+
+def test_boiler_upgrade_skips_thermostat_when_already_present() -> None:
+    # Arrange — the same dwelling but the cylinder already has a thermostat.
+    baseline: EpcPropertyData = _gas_boiler_with_cylinder_baseline()
+    baseline.sap_heating.cylinder_thermostat = "Y"
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert — no thermostat field, but the jacket still added (uninsulated).
+    assert recommendation is not None
+    overlay = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    ).overlay.heating
+    assert overlay is not None
+    assert overlay.cylinder_thermostat is None
+    assert overlay.cylinder_insulation_type == 2
+
+
+def test_electric_boiler_dwelling_yields_no_gas_boiler_upgrade() -> None:
+    # Arrange — an electric boiler (Table 4a code 191) is left alone:
+    # electrification, not a gas swap, is its upgrade path.
+    baseline: EpcPropertyData = _gas_boiler_with_cylinder_baseline()
+    baseline.sap_heating.main_heating_details[0].sap_main_heating_code = 191
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    if recommendation is not None:
+        assert "gas_boiler_upgrade" not in {
+            o.measure_type for o in recommendation.options
+        }
+
+
+def test_off_gas_boiler_yields_no_gas_boiler_upgrade() -> None:
+    # Arrange — an oil boiler (Table 4b code 130) with no mains-gas connection:
+    # a gas boiler cannot be installed, so no upgrade is offered (the gas end-
+    # state is gated on a mains-gas connection).
+    baseline: EpcPropertyData = _gas_boiler_with_cylinder_baseline()
+    baseline.sap_heating.main_heating_details[0].sap_main_heating_code = 130
+    baseline.sap_energy_source.mains_gas = False
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    if recommendation is not None:
+        assert "gas_boiler_upgrade" not in {
+            o.measure_type for o in recommendation.options
+        }
+
+
+def _gas_combi_baseline() -> EpcPropertyData:
+    """A mains-gas combi (Table 4b code 112, no cylinder) with inadequate
+    controls (2111 "TRVs and bypass" — no room thermostat)."""
+    return parse_recommendation_summary("boiler_combi_gas_001431_before.pdf")
+
+
+def test_gas_combi_dwelling_yields_a_combi_boiler_upgrade_bundle() -> None:
+    # Arrange — a mains-gas combi with no cylinder and inadequate controls:
+    # the upgrade replaces it with a condensing combi (code 104) and upgrades
+    # the controls to 2106, touching no cylinder fields.
+    baseline: EpcPropertyData = _gas_combi_baseline()
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    assert recommendation is not None
+    options = {o.measure_type.value: o for o in recommendation.options}
+    assert "gas_boiler_upgrade" in options
+    assert options["gas_boiler_upgrade"].overlay.heating == HeatingOverlay(
+        main_fuel_type=26,
+        heat_emitter_type=1,
+        sap_main_heating_code=104,
+        fan_flue_present=True,
+        boiler_flue_type=2,
+        main_heating_control=2106,
+        water_heating_code=901,
+        water_heating_fuel=26,
+    )
+
+
+def _tune_up_baseline() -> EpcPropertyData:
+    """A mains-gas wet boiler (kept) with "no control" (2101) and an uninsulated,
+    un-thermostatted cylinder — the system tune-up dwelling."""
+    return parse_recommendation_summary("tune_up_from_2101_001431_before.pdf")
+
+
+def test_wet_boiler_dwelling_yields_both_tune_up_options() -> None:
+    # Arrange — a wet boiler whose controls can be improved: both the standard
+    # (2106) and zone (2110) control tune-ups are offered as competing options,
+    # each keeping the boiler and fixing the cylinder.
+    baseline: EpcPropertyData = _tune_up_baseline()
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert — both options carry the control end-state + the cylinder fixes, and
+    # leave the boiler untouched (no fuel / sap code / flue fields).
+    assert recommendation is not None
+    options = {o.measure_type.value: o for o in recommendation.options}
+    assert options["system_tune_up"].overlay.heating == HeatingOverlay(
+        main_heating_control=2106,
+        cylinder_insulation_type=2,
+        cylinder_insulation_thickness_mm=80,
+        cylinder_thermostat="Y",
+    )
+    assert options["system_tune_up_zoned"].overlay.heating == HeatingOverlay(
+        main_heating_control=2110,
+        cylinder_insulation_type=2,
+        cylinder_insulation_thickness_mm=80,
+        cylinder_thermostat="Y",
+    )
+
+
+def test_tune_up_standard_not_offered_when_controls_already_standard() -> None:
+    # Arrange — controls are already standard (2106): the standard tune-up would
+    # be a control no-op, so only the zone tune-up is offered.
+    baseline: EpcPropertyData = _tune_up_baseline()
+    baseline.sap_heating.main_heating_details[0].main_heating_control = 2106
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    assert recommendation is not None
+    measure_types = {o.measure_type for o in recommendation.options}
+    assert "system_tune_up" not in measure_types
+    assert "system_tune_up_zoned" in measure_types
+
+
+def test_tune_up_neither_offered_when_controls_already_zoned() -> None:
+    # Arrange — controls are already zone control (2110): neither tune-up would
+    # improve them, so neither is offered.
+    baseline: EpcPropertyData = _tune_up_baseline()
+    baseline.sap_heating.main_heating_details[0].main_heating_control = 2110
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    if recommendation is not None:
+        measure_types = {o.measure_type for o in recommendation.options}
+        assert "system_tune_up" not in measure_types
+        assert "system_tune_up_zoned" not in measure_types
+
+
+def test_boiler_upgrade_leaves_adequate_controls_unchanged() -> None:
+    # Arrange — the same combi but with already-adequate controls (2113, room
+    # thermostat and TRVs): the upgrade must not move the controls (and must
+    # never downgrade a better control).
+    baseline: EpcPropertyData = _gas_combi_baseline()
+    baseline.sap_heating.main_heating_details[0].main_heating_control = 2113
+
+    # Act
+    recommendation: Recommendation | None = recommend_heating(baseline, _StubProducts())
+
+    # Assert
+    assert recommendation is not None
+    overlay = next(
+        o for o in recommendation.options if o.measure_type == "gas_boiler_upgrade"
+    ).overlay.heating
+    assert overlay is not None
+    assert overlay.main_heating_control is None
diff --git a/tests/domain/modelling/test_measure_type.py b/tests/domain/modelling/test_measure_type.py
index 60c1a816..214df8bc 100644
--- a/tests/domain/modelling/test_measure_type.py
+++ b/tests/domain/modelling/test_measure_type.py
@@ -26,6 +26,9 @@ _EXPECTED_VALUES = {
     "mechanical_ventilation",
     "high_heat_retention_storage_heaters",
     "air_source_heat_pump",
+    "gas_boiler_upgrade",
+    "system_tune_up",
+    "system_tune_up_zoned",
     "solar_pv",
 }
 
diff --git a/tests/harness/test_console.py b/tests/harness/test_console.py
index 8b95e455..4ea237bc 100644
--- a/tests/harness/test_console.py
+++ b/tests/harness/test_console.py
@@ -38,6 +38,9 @@ _GENERATOR_MEASURE_TYPES = (
     "low_energy_lighting",
     "high_heat_retention_storage_heaters",
     "air_source_heat_pump",
+    "gas_boiler_upgrade",
+    "system_tune_up",
+    "system_tune_up_zoned",
 )
 
 
diff --git a/tests/harness/test_report.py b/tests/harness/test_report.py
index 4357b4f7..003ff7bf 100644
--- a/tests/harness/test_report.py
+++ b/tests/harness/test_report.py
@@ -15,6 +15,9 @@ from harness.report import (
     format_report_markdown,
     parity_report_for,
 )
+from tests.domain.modelling._elmhurst_recommendation import (
+    parse_recommendation_summary,
+)
 
 _GOLDEN = (
     Path(__file__).resolve().parents[1]
@@ -99,6 +102,44 @@ def test_each_fired_measure_carries_the_attributes_that_triggered_it() -> None:
     }
 
 
+def test_gas_boiler_upgrade_surfaces_its_eligibility_triggers() -> None:
+    # No golden API cert selects the boiler upgrade (it competes with — and on
+    # houses loses to — the ASHP bundle within the one heating Recommendation),
+    # so the trigger branch is exercised directly, like the cert_to_inputs unit
+    # tests of internal helpers.
+    from harness.report import _triggers_for  # pyright: ignore[reportPrivateUsage]
+
+    # Arrange — a mains-gas wet boiler (SAP code 114) with a hot-water cylinder:
+    # the boiler-upgrade eligibility attributes the report should explain.
+    epc = parse_recommendation_summary("boiler_cyl_gas_001431_before.pdf")
+
+    # Act
+    triggers = _triggers_for(epc, "gas_boiler_upgrade")
+
+    # Assert — the wet-boiler SAP code, the mains-gas connection that makes the
+    # gas end-state installable, and the cylinder that shapes the bundle.
+    assert triggers == {
+        "sap_main_heating_code": 114,
+        "mains_gas": True,
+        "has_hot_water_cylinder": True,
+    }
+
+
+def test_system_tune_up_surfaces_its_eligibility_triggers() -> None:
+    # Like the boiler-upgrade trigger, no golden cert selects a tune-up, so the
+    # branch is covered directly.
+    from harness.report import _triggers_for  # pyright: ignore[reportPrivateUsage]
+
+    # Arrange — a wet boiler (SAP code 102) with "no control" (2101): the wet-
+    # boiler code and the improvable control are what the report should explain.
+    epc = parse_recommendation_summary("tune_up_from_2101_001431_before.pdf")
+
+    # Act / Assert — both tune-up measure types surface the same eligibility.
+    expected = {"sap_main_heating_code": 102, "main_heating_control": 2101}
+    assert _triggers_for(epc, "system_tune_up") == expected
+    assert _triggers_for(epc, "system_tune_up_zoned") == expected
+
+
 def test_few_measure_cert_surfaces_only_its_fired_measures_triggers() -> None:
     # Arrange
     path: Path = _GOLDEN / f"{_WITHIN_TOLERANCE}.json"
diff --git a/tests/orchestration/test_ara_first_run_pipeline_integration.py b/tests/orchestration/test_ara_first_run_pipeline_integration.py
index 8ef68627..b7ffb86f 100644
--- a/tests/orchestration/test_ara_first_run_pipeline_integration.py
+++ b/tests/orchestration/test_ara_first_run_pipeline_integration.py
@@ -168,6 +168,30 @@ def test_first_run_baselines_through_repos_and_is_idempotent_on_rerun(
                     is_active=True,
                     description="LED bulb",
                 ),
+                MaterialRow(
+                    id=6,
+                    type="gas_boiler_upgrade",
+                    total_cost=3000.0,
+                    cost_unit="gbp_per_unit",
+                    is_active=True,
+                    description="Gas condensing boiler",
+                ),
+                MaterialRow(
+                    id=7,
+                    type="system_tune_up",
+                    total_cost=500.0,
+                    cost_unit="gbp_per_unit",
+                    is_active=True,
+                    description="Heating controls + cylinder tune-up",
+                ),
+                MaterialRow(
+                    id=8,
+                    type="system_tune_up_zoned",
+                    total_cost=900.0,
+                    cost_unit="gbp_per_unit",
+                    is_active=True,
+                    description="Zoned heating controls + cylinder tune-up",
+                ),
             ]
         )
         session.commit()