Heat Pump Sizing for 516 m² (5,554 sq ft) — Australia & Mild APAC (Sydney/Melbourne/Tokyo)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump15.0 kW51,182 BTU/h (4.27 Tons)
Annual Electricity Usage4,496 kWh/yrDelivers 20,230 kWh Heat (SCOP 4.5)
Savings vs Direct Electric15,734 kWh/yrSpecific Load: 28.0 W/m²
Electrical Circuit (230V)25 A BreakerPeak Compressor Input: 4.05 kW
Thermal & Electrical Specification Table (516 m² / 5,554 sq ft)
| Heated Floor Area | 516 m² (5,554 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (28.0 W/m² Peak) |
| Peak Space Heating Load | 14.45 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 15.0 kW (51,182 BTU/h · 4.27 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 20,230 kWh Heat → 4,496 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 516 m² (5554 sq ft) house?
For a 516 m² (5554 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 14.45 kW (28.0 W/m²). Including domestic hot water allowance, a 15.0 kW (51,182 BTU/h / 4.27 Ton) heat pump is recommended.
How many kWh of electricity does a 15.0 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 4.5 over 1400 full-load equivalent heating hours, the heat pump consumes approximately 4,496 kWh of electricity per year to deliver 20,230 kWh of heat — saving 15,734 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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