Heat Pump Sizing for 308 m² (3,315 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 Pump20.1 kW68,584 BTU/h (5.72 Tons)
Annual Electricity Usage10,760 kWh/yrDelivers 40,887 kWh Heat (SCOP 3.8)
Savings vs Direct Electric30,127 kWh/yrSpecific Load: 63.2 W/m²
Electrical Circuit (230V)40 A BreakerPeak Compressor Input: 6.7 kW
Thermal & Electrical Specification Table (308 m² / 3,315 sq ft)
| Heated Floor Area | 308 m² (3,315 sq ft) |
| Climate Zone & Design Outdoor Temp | Central Europe / DACH (-12°C Design, DE/CH/AT/NL) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (63.2 W/m² Peak) |
| Peak Space Heating Load | 19.47 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 20.1 kW (68,584 BTU/h · 5.72 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 40,887 kWh Heat → 10,760 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 308 m² (3315 sq ft) house?
For a 308 m² (3315 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in Central Europe / DACH (-12°C Design, DE/CH/AT/NL), the peak space heating load is 19.47 kW (63.2 W/m²). Including domestic hot water allowance, a 20.1 kW (68,584 BTU/h / 5.72 Ton) heat pump is recommended.
How many kWh of electricity does a 20.1 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 10,760 kWh of electricity per year to deliver 40,887 kWh of heat — saving 30,127 kWh/year compared to direct electric radiators.
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