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Resolve a landlord from-main-gas water-heating override to its codes 🟩

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jun-te Kim 2026-06-19 14:03:03 +00:00
parent 8f7a344707
commit 7d70c1d298
1 changed files with 19 additions and 2 deletions
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21
domain/epc/property_overlays/water_heating_overlay.py
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@ -13,10 +13,27 @@ from __future__ import annotations
from typing import Optional
from domain.modelling.simulation import EpcSimulation
from domain.modelling.simulation import EpcSimulation, HeatingOverlay
# Canonical "<system>, <fuel>" description → (water_heating_code, water_heating_fuel).
# water_heating_code: 901 "from main system" (SAP Table 4a inherit-from-main),
# 903 "electric immersion". Fuel codes are the modern RdSAP "(not community)"
# family (26 mains gas, 29 electricity), matching the main_fuel overlay.
_WATER_HEATING_CODES: dict[str, tuple[int, int]] = {
"From main system, mains gas": (901, 26),
}
def water_heating_overlay_for(
water_heating_value: str, building_part: int
) -> Optional[EpcSimulation]:
raise NotImplementedError
codes = _WATER_HEATING_CODES.get(water_heating_value)
if codes is None:
return None
water_heating_code, water_heating_fuel = codes
return EpcSimulation(
heating=HeatingOverlay(
water_heating_code=water_heating_code,
water_heating_fuel=water_heating_fuel,
)
)