Heat Pump Sizing for 172 m² (1,851 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 Pump8.2 kW27,980 BTU/h (2.33 Tons)
Annual Electricity Usage2,355 kWh/yrDelivers 10,598 kWh Heat (SCOP 4.5)
Savings vs Direct Electric8,243 kWh/yrSpecific Load: 44.0 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.22 kW
Thermal & Electrical Specification Table (172 m² / 1,851 sq ft)
| Heated Floor Area | 172 m² (1,851 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 | 7.57 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 8.2 kW (27,980 BTU/h · 2.33 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 10,598 kWh Heat → 2,355 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 172 m² (1851 sq ft) house?
For a 172 m² (1851 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 7.57 kW (44.0 W/m²). Including domestic hot water allowance, a 8.2 kW (27,980 BTU/h / 2.33 Ton) heat pump is recommended.
How many kWh of electricity does a 8.2 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 2,355 kWh of electricity per year to deliver 10,598 kWh of heat — saving 8,243 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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