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Bill balanced-flue gas fires at Table 4a code 609 (58%) 🟩

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#1629: Wythenshawe 163→164 computed; within-0.5 75.6%, MAE 0.737 —
ratchets hold.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Daniel Roth 2026-07-16 16:29:54 +00:00
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datatypes/epc/domain/mapper.py
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@ -6695,6 +6695,11 @@ _PASHUB_SECONDARY_HEATING_TYPE_TO_SAP10: Dict[str, int] = {
# (no qualifier in the label) — PCDB 601, eff 50%. 602 (601 + back boiler)
# rejected: no back-boiler qualifier surveyed.
"Pre 1980 - Open front fire with open flue": 601,
# Balanced-flue (room-sealed) gas fire/wall heater — PCDB 609 ("Gas fire
# or wall heater, balanced flue", flue RS, eff 58%), the only
# balanced-flue code in the 601-613 gas block; distinct from the
# open-flue codes above.
"Fire or wall heater with balanced flue": 609,
# Solid fuel (eff 0.32 column B).
"Open fire in grate": 631,
}