Heat Pump Sizing for 240 m² (2,583 sq ft) — UK & Temperate Maritime (-5°C Design, UK/IE/NZ)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump13.1 kW44,699 BTU/h (3.72 Tons)
Annual Electricity Usage5,501 kWh/yrDelivers 22,554 kWh Heat (SCOP 4.1)
Savings vs Direct Electric17,053 kWh/yrSpecific Load: 52.2 W/m²
Electrical Circuit (230V)25 A BreakerPeak Compressor Input: 3.97 kW
Thermal & Electrical Specification Table (240 m² / 2,583 sq ft)
| Heated Floor Area | 240 m² (2,583 sq ft) |
| Climate Zone & Design Outdoor Temp | UK & Temperate Maritime (-5°C Design, UK/IE/NZ) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (52.2 W/m² Peak) |
| Peak Space Heating Load | 12.53 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 13.1 kW (44,699 BTU/h · 3.72 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.1 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 22,554 kWh Heat → 5,501 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 240 m² (2583 sq ft) house?
For a 240 m² (2583 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in UK & Temperate Maritime (-5°C Design, UK/IE/NZ), the peak space heating load is 12.53 kW (52.2 W/m²). Including domestic hot water allowance, a 13.1 kW (44,699 BTU/h / 3.72 Ton) heat pump is recommended.
How many kWh of electricity does a 13.1 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 4.1 over 1800 full-load equivalent heating hours, the heat pump consumes approximately 5,501 kWh of electricity per year to deliver 22,554 kWh of heat — saving 17,053 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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