Khalim Conn-Kowlessar e43ff79c77 S0380.190: derive gas-combi main fuel from §15.0 when §14.0 Fuel Type is empty ... The newer Elmhurst Summary export lodges a gas combi as §14.0 "Fuel Type" empty + "Main Heating SAP Code" 104 (EES "BGW"), with no fuel string. The site-notes mapper left `main_fuel_type=''`, so `cert_to_inputs` raised `MissingMainFuelType` — blocking the whole gas-combi Summary path (reproduced on the simulated 001431 case). SAP 10.2 Table 4b (PDF p.168) rows 101-119 are "Gas boilers (including mains gas, LPG and biogas)": the code fixes the boiler type/efficiency but NOT the carrier, so 104 alone can't distinguish mains gas from LPG. The disambiguator is §15.0 "Water Heating Fuel Type" — a combi/boiler heats space + water from one appliance — exactly mirroring the existing liquid-fuel (codes 120-141) fallback. `_elmhurst_gas_boiler_main_fuel` adopts the §15.0 carrier only when the SAP code is in 101-119 AND §15.0 resolves to a gas/LPG fuel, so a regular boiler + electric immersion (§15.0 = "Electricity") still strict-raises rather than mis-billing gas as electric. 2291 passed (+1), 0 failed; pyright net-zero on both files. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>		2026-06-02 22:23:02 +00:00
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domain	S0380.190: derive gas-combi main fuel from §15.0 when §14.0 Fuel Type is empty	2026-06-02 22:23:02 +00:00
loaders	demo generated for use in address2uprn	2026-05-08 14:48:15 +00:00
schema	Merge remote-tracking branch 'origin/main' into feature/landlord_data	2026-06-01 17:02:20 +00:00
search	bolstering testing	2026-04-28 13:46:09 +00:00
surveys	Slice S0380.170: Community heating mapper unblock (Table 12 dispatch)	2026-06-02 10:50:21 +00:00
__init__.py	testing out rebaselining	2026-02-12 22:25:03 +00:00
construction_age_band.py	testing out rebaselining	2026-02-12 22:25:03 +00:00
efficiency.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
floor.py	preparing partiy class	2026-02-05 08:54:27 +00:00
fuel.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
heating_controls.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
hotwater.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
main_heating.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
property_type_built_form.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
roof.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
walls.py	beginning to assembly the parity class	2026-02-04 18:34:59 +00:00
windows.py	testing out rebaselining	2026-02-12 22:25:03 +00:00