Heat Pump Sizing for 174 m² (1,873 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 Pump8.3 kW28,321 BTU/h (2.36 Tons)
Annual Electricity Usage2,383 kWh/yrDelivers 10,724 kWh Heat (SCOP 4.5)
Savings vs Direct Electric8,341 kWh/yrSpecific Load: 44.0 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.24 kW
Thermal & Electrical Specification Table (174 m² / 1,873 sq ft)
| Heated Floor Area | 174 m² (1,873 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (44.0 W/m² Peak) |
| Peak Space Heating Load | 7.66 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 8.3 kW (28,321 BTU/h · 2.36 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 10,724 kWh Heat → 2,383 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 174 m² (1873 sq ft) house?
For a 174 m² (1873 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 7.66 kW (44.0 W/m²). Including domestic hot water allowance, a 8.3 kW (28,321 BTU/h / 2.36 Ton) heat pump is recommended.
How many kWh of electricity does a 8.3 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 2,383 kWh of electricity per year to deliver 10,724 kWh of heat — saving 8,341 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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