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On-gas-street electric dwelling (API fuel code 29) is offered HHRSH 🟩

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Daniel Roth 2026-07-01 10:38:30 +00:00
parent 5d99956133
commit 9835b7115c
1 changed files with 7 additions and 6 deletions
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13
domain/modelling/generators/heating_recommendation.py
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@ -714,14 +714,15 @@ def _hhr_storage_option(
def _hhr_storage_eligible(epc: EpcPropertyData) -> bool:
"""HHR storage suits an electrically-heated or off-gas dwelling, unless it is
already HHR or a heat pump (translated from legacy `HeatingRecommender.
is_high_heat_retention_valid`, which keyed on description strings)."""
"""HHR storage suits a non-gas-fuel dwelling, unless it is already HHR or a
heat pump. Eligibility keys on the heating *fuel* (main_fuel_type not in
_GAS_FUEL_CODES), not the gas-connection flag — a dwelling on a gas street
with electric or oil heating has gas_connection_available=True but still
qualifies."""
main: MainHeatingDetail = epc.sap_heating.main_heating_details[0]
if main.sap_main_heating_code == _HHR_STORAGE_SAP_CODE:
return False
if main.main_heating_category == _HEAT_PUMP_CATEGORY:
return False
off_gas: bool = not epc.sap_energy_source.mains_gas
electric_main: bool = main.main_fuel_type == _ELECTRICITY_FUEL
return electric_main or off_gas
non_gas_fuel: bool = main.main_fuel_type not in _GAS_FUEL_CODES
return non_gas_fuel