Heat Pump Sizing for 548 m² (5,899 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 Pump44.9 kW153,205 BTU/h (12.77 Tons)
Annual Electricity Usage19,440 kWh/yrDelivers 79,704 kWh Heat (SCOP 4.1)
Savings vs Direct Electric60,264 kWh/yrSpecific Load: 80.8 W/m²
Electrical Circuit (230V)80 A BreakerPeak Compressor Input: 13.61 kW
Thermal & Electrical Specification Table (548 m² / 5,899 sq ft)
| Heated Floor Area | 548 m² (5,899 sq ft) |
| Climate Zone & Design Outdoor Temp | UK & Temperate Maritime (-5°C Design, UK/IE/NZ) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (80.8 W/m² Peak) |
| Peak Space Heating Load | 44.28 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 44.9 kW (153,205 BTU/h · 12.77 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.1 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 79,704 kWh Heat → 19,440 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 548 m² (5899 sq ft) house?
For a 548 m² (5899 sq ft) building with Older Uninsulated Building (85 W/m² Base) in UK & Temperate Maritime (-5°C Design, UK/IE/NZ), the peak space heating load is 44.28 kW (80.8 W/m²). Including domestic hot water allowance, a 44.9 kW (153,205 BTU/h / 12.77 Ton) heat pump is recommended.
How many kWh of electricity does a 44.9 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 19,440 kWh of electricity per year to deliver 79,704 kWh of heat — saving 60,264 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
60 m² (646 ft²) Heat Pump80 m² (861 ft²) Heat Pump100 m² (1076 ft²) Heat Pump120 m² (1292 ft²) Heat Pump140 m² (1507 ft²) Heat Pump160 m² (1722 ft²) Heat Pump180 m² (1938 ft²) Heat Pump200 m² (2153 ft²) Heat Pump250 m² (2691 ft²) Heat Pump300 m² (3229 ft²) Heat Pump548 m² in Nordic / Scandinavia548 m² in Central Europe / DACH548 m² in US North & Canada Cold548 m² in US Sunbelt & Mediterranean548 m² in Australia & Mild APAC