

The Hudevad P5 is a true Danish heating icon which stands out because it fits in. Available in K1, K2 and K3...
700 x 700 Radiator FAQs
What is the BTU of a 700mm x 700mm Radiator?
The 700 x 700 radiator certainly packs in the heat – you can expect high heat output with this sizing, from 2650 BTU to a whopping 5134 BTU. The exact BTU depends on the model that you choose.
If you are not sure how many BTUs you need to keep your room cosy and warm, use our heat calculator to find out quickly and easily. This can seem complicated, but our STARS (Stelrad Technical Advanced Radiator System) heat loss calculator offers a simpler way to get sizing of radiators right, first time round. Both fabric heat loss and ventilation heat loss are also calculated to establish the radiator output and size required.
Stelrad measure output in Btu/hr, British Thermal Unit per hour which is the standard measurement used to state the amount of output of any heat generating device=. Heat output can also be measured in Watts, 1 watt is equivalent to 3.412 Btu/hr.
What is the Difference Between K1, K2, & K3 700 x 700 Radiators?
There are many codes for the radiators featured on our website, so let’s break it down as simply as possible.
- a radiator with 1 panel and 1 row of convector fins is a K1 or Type 11 radiator
- a radiator with 2 panels and 1 row of convector fins is a P+ or Type 21 radiator
- a radiator with 2 panels and 2 rows of convector fins is a K2 or Type 22 radiator
- a radiator with 3 panels and 3 rows of convector fins is a K3 or Type 23 radiator
You will find a “Type” dropdown menu on each product page. Here it will show you whether the radiator is available as a K1, P+, K2, or K3 radiator.