Heat Pump Sizing for 348 m² (3,746 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 Pump24.3 kW82,915 BTU/h (6.91 Tons)
Annual Electricity Usage7,361 kWh/yrDelivers 33,124 kWh Heat (SCOP 4.5)
Savings vs Direct Electric25,763 kWh/yrSpecific Load: 68.0 W/m²
Electrical Circuit (230V)40 A BreakerPeak Compressor Input: 6.57 kW
Thermal & Electrical Specification Table (348 m² / 3,746 sq ft)
| Heated Floor Area | 348 m² (3,746 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (68.0 W/m² Peak) |
| Peak Space Heating Load | 23.66 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 24.3 kW (82,915 BTU/h · 6.91 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 33,124 kWh Heat → 7,361 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 348 m² (3746 sq ft) house?
For a 348 m² (3746 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 23.66 kW (68.0 W/m²). Including domestic hot water allowance, a 24.3 kW (82,915 BTU/h / 6.91 Ton) heat pump is recommended.
How many kWh of electricity does a 24.3 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 7,361 kWh of electricity per year to deliver 33,124 kWh of heat — saving 25,763 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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