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BTU Calculator
Use our BTU calculator to easily work out what size radiator you will need, by entering information about your room in our calculator.
We’re dedicated to helping you choose the perfect radiator for your home. Explore our guides,
calculators and other resources below, created to help you feel confident when buying your next radiator.
There are a lot of factors to consider when buying a radiator. Our radiator buying guide walks you through exactly what you need to do.
We offer free-of-charge delivery on all of our radiators and towel rails to mainland postcodes in England, Wales and Scotland.
Northern Ireland and all offshore islands will be chargeable; please contact us, and we can supply a shipping cost.
We also offer a paid specialist 2-man delivery service to a room of your choice.
Deliveries are made Monday to Friday excluding Bank Holidays. There is also a closure over the Christmas period.
All stocked items are delivered in 48-72 hours; made-to-order radiators will take longer - lead times for made-to-order items are listed on their respective product pages.
For radiators, BTU refers to the amount of energy required to heat a particular room. The higher the BTU rating, the greater the radiator’s heat output. How effective the radiator will be, though, depends on factors such as the size of the room and how well insulated it is. A radiator’s ability to transfer heat will depend on its material, size and surface area as well as the water temperature within the system.
Click the link below to learn more about BTU and heat output. You will also find a link to our BTU Calculator to work out your room's BTU requirement to understand how much heat your radiators need to emit in order to heat the room effectively.
Whether you're choosing between single and double panels, working out the right BTU output for your room, or simply curious about the history of home heating, we're here to help.
Our articles cover practical buying advice, energy-saving tips, and expert insight, all designed to make choosing and caring for your radiators that bit easier. Explore our guides below, and if you can't find what you're looking for, our Customer Service team is always happy to help.
We feel it is important to ensure important information is always accessible. That's why every product page contains downloadable PDF brochures and fitting instructions.
We've also made our full brochure, which we can post out to you free of charge, readily available to download so it's always to hand.
Click the link below to download a brochure PDF; alternatively, follow the same link to request a physical copy of our Brochure, Colour and Special Finishes Chart.
The most crucial element when considering the purchase of a new radiator is the amount of heat it outputs. The radiator has one fundamental job, to provide you with the necessary heat you require for the space you are heating.
For hydronic radiators, which go onto a water-based central heating system, there are a few simple factors that govern output; The temperature of the water when it leaves the boiler/heat source (known as the flow temperature) and the total surface area and amount of material contained within the product that will heat up, and therefore “radiate”.