BTU calculator
Work out how much heat your room needs in BTUs and Watts, so you can choose the right radiator or boiler. Enter your room details for an instant estimate.
Heat required
A guidance estimate, aim within about 10%. Multiple radiators can be combined to reach the total.
What is a BTU?
BTU stands for British Thermal Unit, a measure of heat. The BTU figure tells you how much heat output a room needs to stay comfortable. Once you know it, you can choose a radiator (or size a boiler) that delivers enough heat. If you're between sizes, it's usually best to round up, and remember that several radiators can be combined to hit the total for larger rooms. Need a hand? We're happy to advise and quote.
Not sure what you need?
Tell us about your home and we'll recommend the right setup and give you a free quote.