Heat Pump Sizing for 24 m² (258 sq ft) — Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump1.7 kW5,801 BTU/h (0.48 Tons)
Annual Electricity Usage864 kWh/yrDelivers 2,938 kWh Heat (SCOP 3.4)
Savings vs Direct Electric2,074 kWh/yrSpecific Load: 47.2 W/m²
Electrical Circuit (230V)6 A BreakerPeak Compressor Input: 0.65 kW
Thermal & Electrical Specification Table (24 m² / 258 sq ft)
| Heated Floor Area | 24 m² (258 sq ft) |
| Climate Zone & Design Outdoor Temp | Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (47.2 W/m² Peak) |
| Peak Space Heating Load | 1.13 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 1.7 kW (5,801 BTU/h · 0.48 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 2,938 kWh Heat → 864 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 Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK), the peak space heating load is 1.13 kW (47.2 W/m²). Including domestic hot water allowance, a 1.7 kW (5,801 BTU/h / 0.48 Ton) heat pump is recommended.
How many kWh of electricity does a 1.7 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 3.4 over 2600 full-load equivalent heating hours, the heat pump consumes approximately 864 kWh of electricity per year to deliver 2,938 kWh of heat — saving 2,074 kWh/year compared to direct electric radiators.
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