Heat Pump Sizing for 604 m² (6,501 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 Pump38.8 kW132,391 BTU/h (11.03 Tons)
Annual Electricity Usage21,094 kWh/yrDelivers 80,157 kWh Heat (SCOP 3.8)
Savings vs Direct Electric59,063 kWh/yrSpecific Load: 63.2 W/m²
Electrical Circuit (230V)80 A BreakerPeak Compressor Input: 12.93 kW
Thermal & Electrical Specification Table (604 m² / 6,501 sq ft)
| Heated Floor Area | 604 m² (6,501 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 | 38.17 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 38.8 kW (132,391 BTU/h · 11.03 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 80,157 kWh Heat → 21,094 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 604 m² (6501 sq ft) house?
For a 604 m² (6501 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 38.17 kW (63.2 W/m²). Including domestic hot water allowance, a 38.8 kW (132,391 BTU/h / 11.03 Ton) heat pump is recommended.
How many kWh of electricity does a 38.8 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 21,094 kWh of electricity per year to deliver 80,157 kWh of heat — saving 59,063 kWh/year compared to direct electric radiators.
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