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Resolve a from-main wood-logs water-heating override to the wood fuel 🟩

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-07-01 13:02:13 +00:00
parent c24e465974
commit ea3696e8d5
2 changed files with 5 additions and 0 deletions
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4
domain/epc/property_overlays/water_heating_overlay.py
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@ -26,6 +26,10 @@ _WATER_HEATING_CODES: dict[str, tuple[int, int]] = {
"From main system, LPG (bulk)": (901, 27),
"From main system, bottled LPG": (901, 3),
"From main system, house coal": (901, 33),
# Wood logs — RdSAP water_heating_fuel 6 (biomass ~0.028 kgCO2/kWh), from
# main (901). A wood-fired individual-main dwelling's DHW must not fall to
# house coal 33 (~0.395), a ~14x carbon overstatement (ADR-0043).
"From main system, wood logs": (901, 6),
"Electric immersion, electricity": (903, 29),
# "boiler/circulator for water heating only" — SAP Table 4a code 911 (gas).
"Gas boiler/circulator, mains gas": (911, 26),

1
domain/epc/property_overrides/water_heating_type.py
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@ -21,6 +21,7 @@ class WaterHeatingType(Enum):
FROM_MAIN_LPG_BULK = "From main system, LPG (bulk)"
FROM_MAIN_BOTTLED_LPG = "From main system, bottled LPG"
FROM_MAIN_HOUSE_COAL = "From main system, house coal"
FROM_MAIN_WOOD_LOGS = "From main system, wood logs"
ELECTRIC_IMMERSION = "Electric immersion, electricity"
GAS_BOILER_CIRCULATOR_MAINS_GAS = "Gas boiler/circulator, mains gas"
UNKNOWN = "Unknown"