Stove kW Heat Output Calculator & Room Sizing Guide for UK Homes
A room-volume estimate for stove output, plus sale-price medians by kW band from this catalogue.
A volume estimate, not a heat-loss survey
A common UK rule of thumb divides the room volume in cubic metres by about 14 in a well insulated room, about 12 in an average room, and about 10 in a poorly insulated or draughty room.
That is a shortlist tool. It ignores glazing, open doors, ventilation and the actual heat loss of the building. A HETAS-registered installer sizes the appliance for the room.
Use the result to open the matching kW band. Do not treat it as a specification.
Under 5kW
- Median
- £1,479
- IQR
- £1,262.15
- Lower quartile
- £862
- Upper quartile
- £2,124.15
Median £1,479 (IQR £1,262, from £269 to £3,995, n=153, 1 outlier removed).
5kW band
- Median
- £1,195
- IQR
- £1,119.51
- Lower quartile
- £749.50
- Upper quartile
- £1,869
Median £1,195 (IQR £1,120, from £195 to £3,685, n=583, 24 outliers removed).
5kW to 8kW
- Median
- £1,795
- IQR
- £1,254.61
- Lower quartile
- £1,149.99
- Upper quartile
- £2,404.60
Median £1,795 (IQR £1,255, from £480 to £4,560, n=123, 3 outliers removed).
8kW and above
- Median
- £1,563
- IQR
- £1,426.50
- Lower quartile
- £934
- Upper quartile
- £2,360.50
Median £1,563 (IQR £1,427, from £550 to £4,799, n=146, 4 outliers removed).