Heat Pump Sizing for 24 m² (258 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 Pump1.6 kW5,459 BTU/h (0.45 Tons)
Annual Electricity Usage531 kWh/yrDelivers 2,016 kWh Heat (SCOP 3.8)
Savings vs Direct Electric1,485 kWh/yrSpecific Load: 40.2 W/m²
Electrical Circuit (230V)6 A BreakerPeak Compressor Input: 0.53 kW
Thermal & Electrical Specification Table (24 m² / 258 sq ft)
| Heated Floor Area | 24 m² (258 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 | 0.96 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 1.6 kW (5,459 BTU/h · 0.45 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 2,016 kWh Heat → 531 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 24 m² (258 sq ft) house?
For a 24 m² (258 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 0.96 kW (40.2 W/m²). Including domestic hot water allowance, a 1.6 kW (5,459 BTU/h / 0.45 Ton) heat pump is recommended.
How many kWh of electricity does a 1.6 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 531 kWh of electricity per year to deliver 2,016 kWh of heat — saving 1,485 kWh/year compared to direct electric radiators.
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