Project Details

Results

Required Heat Output:0 BTU/hr

Equivalent Watts:0 W

If your room is between sizes or poorly insulated, always err on the side of a larger radiator. It will simply shut off quicker once the room is warm.

Shop Radiators at Wickes

Frequently Asked Questions

What does BTU mean?

BTU stands for British Thermal Unit. It is a traditional unit of heat measurement representing the energy needed to heat one pound of water by one degree Fahrenheit. In the UK, radiators are strictly rated by their BTU output per hour.

Why do bathrooms need more BTUs?

Bathrooms generally require a higher BTU multiplier because they are naturally humid, often lack soft furnishings to retain heat, and you are usually wet and unclothed, meaning the ambient air needs to be significantly warmer for comfort.

Are two small radiators better than one large one?

Often, yes. In a large or long room, placing two smaller radiators at opposite ends distributes the heat far more evenly than one massive radiator, reducing cold spots.

What happens if a radiator has too many BTUs?

There is very little penalty for oversizing a radiator slightly, provided it features a Thermostatic Radiator Valve (TRV). It will simply heat the room faster and shut off sooner. Undersizing is much worse, leaving the room constantly cold.