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SAP 10.2 Table 4f lists annual pumps + fans electricity consumption by main heating category. The cascade's `_PUMPS_FANS_KWH_BY_MAIN_CATEGORY` only had cat-2 (gas-fired boilers, 160 kWh = 115 pump + 45 flue fan) — HP certs (cat 4) fell through to the 130 kWh/yr DEFAULT. Heat pumps have NO additional pumps/fans contribution per Table 4f: the HP system's circulation pump + fans are already incorporated into the seasonal COP. Worksheet line (249) "Pumps, fans and electric keep-hot" shows 0.0000 kWh for cert 0380 (ASHP). Added `4: 0.0`. Effect on cert 0380 API path: pumps_fans cost £17.15 → £0.00 (matches worksheet); total cost £171.36 → £154.21 (worksheet £206.75; remaining Δ -£52 is dominated by the hot-water cascade gap which is the next slice — cylinder storage + primary loss + HP HW COP + separate electric shower line all need work). No golden cert residual shifts (cohort certs are all gas boilers). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> |
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