Heat Pump Sizing for 60 m² (646 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 Pump3.7 kW12,625 BTU/h (1.05 Tons)
Annual Electricity Usage1,374 kWh/yrDelivers 5,634 kWh Heat (SCOP 4.1)
Savings vs Direct Electric4,260 kWh/yrSpecific Load: 52.2 W/m²
Electrical Circuit (230V)10 A BreakerPeak Compressor Input: 1.12 kW
Thermal & Electrical Specification Table (60 m² / 646 sq ft)
| Heated Floor Area | 60 m² (646 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 | 3.13 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 3.7 kW (12,625 BTU/h · 1.05 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.1 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 5,634 kWh Heat → 1,374 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 60 m² (646 sq ft) house?
For a 60 m² (646 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 3.13 kW (52.2 W/m²). Including domestic hot water allowance, a 3.7 kW (12,625 BTU/h / 1.05 Ton) heat pump is recommended.
How many kWh of electricity does a 3.7 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 1,374 kWh of electricity per year to deliver 5,634 kWh of heat — saving 4,260 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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