How do I know the output of the radiator to buy?
This is what I use: Good luck. Sizeing Radiators The size of radiator required for a room depends on two factors. Firstly, the temperature that you want it to be able to maintain which is a relatively straightforward task and you can use the table below as a guide: -A huge range of radiators can be bought here and you can work out exactly what you need by using the BTU calculator on the same page Ideal Room Temperatures (deg C) Lounge 21 Dining Room 21 Kitchen 16 Bedrooms 15 Bathroom 23 Stairs 18 Secondly, the heat loss from your room. The calculations for this are quite complex since they depend upon the size of windows, numbers of doors and, in particular, the construction materials used in the building (Click here to calculate the ‘U’ values) to get an accurate radiator size. Too big and the system will overshoot its temperature and be less economical to run, to small and it won’t reach its desired temperature. (Some of the poorer installers get round this complex step by putting in
