Heat Pump Sizing for 460 m² (4,951 sq ft) — Central Europe / DACH (-12°C Design, DE/CH/AT/NL)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump45.5 kW155,252 BTU/h (12.94 Tons)
Annual Electricity Usage24,835 kWh/yrDelivers 94,374 kWh Heat (SCOP 3.8)
Savings vs Direct Electric69,539 kWh/yrSpecific Load: 97.7 W/m²
Electrical Circuit (230V)90 A BreakerPeak Compressor Input: 15.17 kW
Thermal & Electrical Specification Table (460 m² / 4,951 sq ft)
| Heated Floor Area | 460 m² (4,951 sq ft) |
| Climate Zone & Design Outdoor Temp | Central Europe / DACH (-12°C Design, DE/CH/AT/NL) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (97.7 W/m² Peak) |
| Peak Space Heating Load | 44.94 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 45.5 kW (155,252 BTU/h · 12.94 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 94,374 kWh Heat → 24,835 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 460 m² (4951 sq ft) house?
For a 460 m² (4951 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Central Europe / DACH (-12°C Design, DE/CH/AT/NL), the peak space heating load is 44.94 kW (97.7 W/m²). Including domestic hot water allowance, a 45.5 kW (155,252 BTU/h / 12.94 Ton) heat pump is recommended.
How many kWh of electricity does a 45.5 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 3.8 over 2100 full-load equivalent heating hours, the heat pump consumes approximately 24,835 kWh of electricity per year to deliver 94,374 kWh of heat — saving 69,539 kWh/year compared to direct electric radiators.
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