Answer
What size radiator for a 5m x 4m kitchen?
A 5m × 4m kitchen needs roughly 5,241 BTU (1,536 W) of heat — choose a radiator rated at that output or higher (measured at Δt50).
This is a guide based on standard heat-loss factors. Insulation, glazing, exterior walls and orientation change the figure — the calculator below adjusts for all of them.
| Room | 5m × 4m kitchen (~20 m²) |
|---|---|
| Required output | 5,241 BTU (1,536 W) |
| Choose a radiator rated | 5,241 BTU or higher |
Fine-tune with the BTU calculator → · Find a matching radiator →
2026 figures · BTU uses standard UK heat-loss methodology; running costs use the Ofgem price cap · always confirm with a professional.