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The gov-API `main_fuel_type`/`water_heating_fuel` enum (epc_codes.csv) codes 30="waste combustion (community)", 31="biomass (community)", 32="biogas (community)" collide in VALUE with the Table-32 electricity codes 30 (standard rate), 31 (7-hour low) and 32 (7-hour high). All three sit in `_ELECTRIC_FUEL_CODES`, so `is_electric_fuel_code` flagged a community-scheme main as electric and `_is_electric_main` routed its cost through the off-peak electricity branch — BYPASSING the heat-network rate in `_heat_network_factor_fuel_code`. Cert 8536 (biomass community, SAP code 301) was billing at 5.5 p/kWh grid electricity instead of the 4.24 p/kWh heat-network rate → -17.2 SAP. Per RdSAP 10 §C / SAP 10.2 Table 12 (PDF p.191) the community waste/biomass/biogas rows are codes 42/43/44 (the same rows the backwards-compat enum codes 11/12/13 already map to). Add 30->42, 31->43, 32->44 to both API fuel-translation tables. The remap CANNOT be global (`canonical_fuel_code`): the cascade uses the bare Table-32 code 30 internally as `_STANDARD_ELECTRICITY_FUEL_CODE` (the RdSAP no-water-heating immersion default writes `water_heating_fuel=30`), so a blanket remap mis-prices genuine grid electricity as community waste (cert 2211 regressed +16 SAP in a prototype). Instead `_heat_network_community_fuel_code` translates only when `_is_heat_network_main` is true, at the `_main_fuel_code` / `_water_heating_fuel_code` fuel-TYPE boundary, where the community meaning is unambiguous. Per the strict-raise principle ([[reference-unmapped-sap-code]]), a heat-network main lodging a colliding community fuel the table doesn't cover raises `UnmappedSapCode` rather than silently falling through to the same-numbered electricity code. Eval (API SAP vs lodged): cert 8536 -17.25 -> -6.51, cert 5036 -6.29 -> +1.36; mean|err| 1.329 -> 1.312, within-1.0 67.88% -> 67.99%, within-2.0 81.74% -> 81.85%, within-0.5 held at 53.14%, 909 computed / 0 raises. No golden / calculator regressions. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| pcdb | ||
| __init__.py | ||
| table_4b.py | ||
| table_12.py | ||
| table_12a.py | ||
| table_13.py | ||
| table_32.py | ||