This calculator is based on the standard guide of 1 kW per 14 m³ of room volume, adjusted for your insulation and glazing.
Room Dimensions
Insulation Level
Poor = solid walls, single glazing or no loft insulation · Good = cavity walls, double glazing, fully insulated
Consider how quickly your house cools down when the heating goes off. A poorly insulated house will not retain the heat for long.
Window & Glazing
Number of External Walls
How many of the room's walls face outside, rather than an adjoining room or corridor?
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kW recommended
The calculator cannot take into account all unseen factors in your home or how many hours a day you plan to have the stove lit, so tends to underestimate the output required. It is only an estimate and must be confirmed by a home survey prior to purchase.