Heat Pump Sizing for 138 m² (1,485 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 Pump6.1 kW20,814 BTU/h (1.73 Tons)
Annual Electricity Usage3,067 kWh/yrDelivers 11,655 kWh Heat (SCOP 3.8)
Savings vs Direct Electric8,588 kWh/yrSpecific Load: 40.2 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.03 kW
Thermal & Electrical Specification Table (138 m² / 1,485 sq ft)
| Heated Floor Area | 138 m² (1,485 sq ft) |
| Climate Zone & Design Outdoor Temp | Central Europe / DACH (-12°C Design, DE/CH/AT/NL) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (40.2 W/m² Peak) |
| Peak Space Heating Load | 5.55 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 6.1 kW (20,814 BTU/h · 1.73 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 11,655 kWh Heat → 3,067 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 138 m² (1485 sq ft) house?
For a 138 m² (1485 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in Central Europe / DACH (-12°C Design, DE/CH/AT/NL), the peak space heating load is 5.55 kW (40.2 W/m²). Including domestic hot water allowance, a 6.1 kW (20,814 BTU/h / 1.73 Ton) heat pump is recommended.
How many kWh of electricity does a 6.1 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 3,067 kWh of electricity per year to deliver 11,655 kWh of heat — saving 8,588 kWh/year compared to direct electric radiators.
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