What Size Stove Do I Need?
Our kW calculator gives you an instant recommendation based on your room dimensions and insulation. Enter your measurements below and find out in seconds.
The Geekculator
Work out the right stove output for your room in seconds
2Good insulation?
Double glazing, loft & cavity wall insulation
3Existing open fireplace?
An open fire loses heat up the flue when not in use
Enter your room dimensions above to see your recommendation.
Insulation Categories
Your home's insulation level affects how much heat the stove needs to produce. Here is how to assess yours.
Poor Insulation
+ 1.0 kWHomes built before 1980, single glazing, solid walls, minimal loft insulation, or multiple draughts.
Average Insulation
StandardA home built in the 1990s with double glazing and basic cavity wall insulation.
Good Insulation
StandardModern, airtight homes built after 2008 with full insulation and sealed windows.
Quick Reference Guide
| Output | Typical Room |
|---|---|
| 3 - 4 kW | Small bedroom, snug, or study |
| 5 kW | Standard living room (~25 m3) |
| 6 - 7 kW | Larger sitting room or open-plan |
| 8 - 10 kW | Large open-plan space |
| 10 kW+ | Consider a boiler stove |
Got your number?
Book a free home survey and we will give you a precise stove recommendation tailored to your property — no obligation.