Sheffield's hilly landscape and older housing stock create variable heat loss profiles. Many South Yorkshire homes are on mains gas, making heat pump savings versus gas modest in the short term. The £7,500 BUS grant changes the maths considerably — and Sheffield's growing renewable energy community means MCS-certified installers are increasingly available for competitive quotes.
Heat demand starts from typical UK figures by property type (detached ~14,000 kWh/yr, semi ~12,000, terrace ~10,000, flat ~6,000) and is adjusted for bedrooms and EPC rating. An EPC C home uses ~15% less heat than D; an F home uses ~30% more.
Heat pump electricity = heat demand ÷ SCOP. We assume SCOP 3.0 for ASHP, 4.0 for GSHP and 2.5 for air-to-air systems. Real-world SCOP depends on radiator sizing, hot water demand and your installer's setup quality.
Current cost uses 6.5p/kWh gas, 9p oil, 12p LPG. Override with your actual bill for a more accurate result.
Install costs: ASHP £10–14k typical, GSHP £18–25k (deeper bore + groundwork), air-to-air £4–7k. The Boiler Upgrade Scheme grant is deducted. We compare against the cost of replacing a like-for-like boiler (~£3,000) to give an honest "incremental" payback.
Estimates only. SCOP is highly installer-dependent and your savings hinge on getting the radiator sizing right. Get at least 3 quotes from MCS-certified installers.