Heat Pump Sizing for 118 m² (1,270 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 Pump8.1 kW27,638 BTU/h (2.3 Tons)
Annual Electricity Usage4,123 kWh/yrDelivers 15,666 kWh Heat (SCOP 3.8)
Savings vs Direct Electric11,543 kWh/yrSpecific Load: 63.2 W/m²
Electrical Circuit (230V)15 A BreakerPeak Compressor Input: 2.7 kW
Thermal & Electrical Specification Table (118 m² / 1,270 sq ft)
| Heated Floor Area | 118 m² (1,270 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 | 7.46 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 8.1 kW (27,638 BTU/h · 2.3 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 15,666 kWh Heat → 4,123 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 118 m² (1270 sq ft) house?
For a 118 m² (1270 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 7.46 kW (63.2 W/m²). Including domestic hot water allowance, a 8.1 kW (27,638 BTU/h / 2.3 Ton) heat pump is recommended.
How many kWh of electricity does a 8.1 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 4,123 kWh of electricity per year to deliver 15,666 kWh of heat — saving 11,543 kWh/year compared to direct electric radiators.
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