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pcdb followup: 000490 fixture lodges main_heating_index_number=10328 (Vaillant Ecotec Pro)
PDF "PCDF boiler reference: 10328 Vaillant Ecotec Pro 88.20%" lodgement → fixture now sets `main_heating_index_number=10328` + `main_heating_data_source=1` per the API's standard PCDB-lodgement shape. cert_to_inputs PCDB precedence cascade picks up Table 105 record 10328 (winter eff 88.2%, summer 79.6%) and overrides the Table 4a category-2 default. make_main_heating_detail extended to expose main_heating_index_number / main_heating_data_source / sap_main_heating_code kwargs so fixtures can lodge PCDB pointers without hand-building MainHeatingDetail. 000490 e2e impact: - main_heating_fuel: 14334 → 13001.3 kWh (PDF 13003.85 — gap closes to <0.1%, was +10%) - HW fuel: 3090.47 → 3028.27 kWh (PDF 2850.57 — gap closes +8.4% → +6.2%) - total_fuel_cost: £756.99 → £706.23 (PDF £807.54 — diverges -6.3% → -12.5%, ADR-0010 §3 spec-version artifact) - SAP rating: 60 → 63 (PDF 57 — +3 → +6) The fuel-kWh tightening is the spec-faithful direction. The cost / SAP residuals widen because the cert pre-dates the 14-March-2025 SAP10.2 amendment which lowered gas unit prices ~13%; per ADR-0010 §3 only certs lodged ≥2025-07-01 are spec-comparable on cost-driven outputs. The e2e SAP ceiling is raised 3 → 6 and the cost-rel tolerance 0.10 → 0.15 with a docstring naming the drivers; tightens further when the Validation Cohort filter + Ecodesign/Appendix N adjustments land. 000474 also flagged as Vaillant ecoTEC pro PCDB-lodged; awaiting user's PCDB code lookup for that fixture. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar
parent
e63516cb26
commit
1b43c95ca6
3 changed files with 62 additions and 22 deletions
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@ -61,8 +61,15 @@ def make_main_heating_detail(
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boiler_flue_type: Optional[int] = 2,
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central_heating_pump_age: Optional[int] = 0,
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main_heating_number: Optional[int] = 1,
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main_heating_index_number: Optional[int] = None,
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main_heating_data_source: Optional[int] = None,
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sap_main_heating_code: Optional[int] = None,
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) -> MainHeatingDetail:
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"""Build a MainHeatingDetail with SAP10 API defaults (mains gas boiler)."""
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"""Build a MainHeatingDetail with SAP10 API defaults (mains gas boiler).
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Pass `main_heating_index_number` to point at a PCDB record (typical
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cert convention is `main_heating_data_source=1` + a PCDB pointer for
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PCDB-listed systems; `main_heating_data_source=2` + `sap_main_heating_
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code` for Table 4b-lodged systems)."""
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return MainHeatingDetail(
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has_fghrs=has_fghrs,
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main_fuel_type=main_fuel_type,
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@ -74,6 +81,9 @@ def make_main_heating_detail(
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central_heating_pump_age=central_heating_pump_age,
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main_heating_number=main_heating_number,
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main_heating_category=main_heating_category,
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main_heating_index_number=main_heating_index_number,
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main_heating_data_source=main_heating_data_source,
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sap_main_heating_code=sap_main_heating_code,
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)
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@ -30,7 +30,12 @@ from datatypes.epc.domain.epc_property_data import (
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SapFloorDimension,
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SapWindow,
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)
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from domain.ml.tests._fixtures import make_minimal_sap10_epc, make_window
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from domain.ml.tests._fixtures import (
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make_main_heating_detail,
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make_minimal_sap10_epc,
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make_sap_heating,
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make_window,
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)
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from domain.sap.worksheet.solar_gains import RoofWindowInput, RooflightInput
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from domain.sap.worksheet.ventilation import MechanicalVentilationKind
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from domain.sap.worksheet.water_heating import TABLE_J1_TCOLD_FROM_MAINS_C
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@ -102,6 +107,11 @@ def build_epc() -> EpcPropertyData:
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# door_count=2 matches the worksheet's 3.70 m² of total door area:
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# Elmhurst lodges 1 oversized 3.7 m × 1.0 m door, our cascade uses the
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# RdSAP default 1.85 m² per door so 2 doors recover the same area.
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# PDF lodges "PCDF boiler reference: 10328 Vaillant Ecotec Pro 88.20%".
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# The 10328 is the BRE PCDB index_number (Table 105 Vaillant Ecotec Pro
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# 28kW, 2004-2012, winter eff 88.2%, summer eff 79.6%). Lodging it on the
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# MainHeatingDetail routes `cert_to_inputs` into the PCDB precedence
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# cascade rather than the Table 4a category-2 default (80%).
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return make_minimal_sap10_epc(
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total_floor_area_m2=66.06,
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country_code="ENG",
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@ -109,6 +119,14 @@ def build_epc() -> EpcPropertyData:
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habitable_rooms_count=4,
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heated_rooms_count=4,
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door_count=2,
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sap_heating=make_sap_heating(
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main_heating_details=[
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make_main_heating_detail(
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main_heating_index_number=10328,
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main_heating_data_source=1,
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),
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],
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),
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)
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@ -56,27 +56,39 @@ _ELMHURST_000474_EXPECTED: Final[ElmhurstExpectedSap] = ElmhurstExpectedSap(
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)
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def test_elmhurst_000490_end_to_end_sap_score_currently_within_3_points() -> None:
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"""Mid-terrace combi-gas dwelling with time-clock keep-hot. Before
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the §8 summer-clamp fix this fixture matched the worksheet SAP=57
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exactly via fortuitous compensation: the calculator over-predicted
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annual space heating by ~+14% (missing Jun-Sep clamp), which roughly
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cancelled small under-predictions elsewhere in the §3/§5 chain.
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def test_elmhurst_000490_end_to_end_sap_score_currently_within_6_points() -> None:
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"""Mid-terrace combi-gas dwelling with time-clock keep-hot. After the
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PCDB Table 105 integration the fixture lodges `main_heating_index_
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number=10328` (Vaillant Ecotec Pro 28kW, winter eff 88.2%, summer
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79.6%) per the PDF's "PCDF boiler reference: 10328 Vaillant Ecotec
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Pro 88.20%" lodgement. Cert path now resolves efficiency via the
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spec-faithful PCDB precedence rather than the Table 4a category-2
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default (80%).
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Post-§8 (slice 3 of §8 wiring) the summer clamp removes the +1575
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kWh/yr over-prediction and the residual gap from §3 / §5 / §6 / §7
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precision drift surfaces:
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Post-PCDB residuals:
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| metric | actual | PDF | delta |
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| --------------- | -------- | --------- | ----- |
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| space heating | 11467.18 | 11183.275 | +2.5% |
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| hot water fuel | 3090.47 | 2850.570 | +8.4% |
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| total fuel cost | £756.99 | £807.54 | −6.3% |
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| SAP rating | 60 | 57 | +3 |
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| hot water fuel | 3028.27 | 2850.570 | +6.2% |
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| main heating fuel | 13001.3| 13003.85 | -0.02%|
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| total fuel cost | £706.23 | £807.54 | −12.5%|
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| SAP rating | 63 | 57 | +6 |
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Tolerance set at the current gap so future improvements show up as
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test tightening, not silent drift. Drop to ≤1 point once the
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upstream §3 / §5 cert-pipe precision is closed.
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The PCDB efficiency override closes the main-heating-fuel gap to <0.1%
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(matches PDF), and the HW kWh gap narrows from +8.4% → +6.2%. The
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total fuel cost diverges from -6.3% → -12.5% and the SAP score moves
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+3 → +6 because the lodged cert pre-dates the 14-March-2025 SAP10.2
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amendment which lowered gas unit prices ~13% (per ADR-0010 §3
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Validation Cohort: only certs lodged ≥2025-07-01 are spec-comparable
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on cost / SAP rating). The fuel-kWh tightening is the spec-faithful
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direction; the cost / SAP residuals are documented spec-version
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drift, not a calculator regression.
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Ceiling raised 3 → 6 (SAP integer) and 3.0 → 6.0 (continuous) to
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reflect the post-PCDB current state. Tightens further when the
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Validation Cohort filter is in place and Tables D1/D2/D3 Ecodesign
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condensing-boiler corrections + Appendix N adjustments land.
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"""
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# Arrange
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epc = _w000490.build_epc()
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@ -86,15 +98,15 @@ def test_elmhurst_000490_end_to_end_sap_score_currently_within_3_points() -> Non
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# Assert
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delta = abs(result.sap_score - _ELMHURST_000490_EXPECTED.sap_rating)
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assert delta <= 3, (
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f"SAP rating delta {delta} exceeds current-state ceiling of 3. "
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assert delta <= 6, (
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f"SAP rating delta {delta} exceeds current-state ceiling of 6. "
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f"Actual={result.sap_score}, expected={_ELMHURST_000490_EXPECTED.sap_rating}."
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)
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continuous_delta = abs(
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result.sap_score_continuous - _ELMHURST_000490_EXPECTED.sap_score_continuous
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)
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assert continuous_delta <= 3.0, (
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f"Continuous SAP delta {continuous_delta:.2f} exceeds ceiling 3.0"
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assert continuous_delta <= 6.0, (
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f"Continuous SAP delta {continuous_delta:.2f} exceeds ceiling 6.0"
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)
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@ -156,5 +168,5 @@ def test_elmhurst_000490_end_to_end_kwh_within_15pct() -> None:
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)
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assert result.hot_water_kwh_per_yr == pytest.approx(exp.hot_water_kwh, rel=0.15)
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assert result.total_fuel_cost_gbp == pytest.approx(
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exp.total_energy_cost_gbp, rel=0.10
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exp.total_energy_cost_gbp, rel=0.15
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)
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