Hi. How do I know what size radiators to buy if the rads aren't there? Thanks

www.radiatorsizingcalculator.co.uk

I recommend you use a BTU calculator a good site can be found at http://www.radcalcs.com/ Hope that helps

Hi, there is a formula that takes into account,windows and there insulation properties and position and also the volume of the room-you will need to get in a professional for this. But as a rule any daily living space up to around 40sq ft will need no more than a double 800x600 rad,hallway 800x600 double bedrooms similar rule but single rads but also consider where they are in the room and the size of wall you want to attach them to. Hope this helps Andy

your plumber will be able to advise you

normally about 8000 btu for a rad in a room just ask your local plumbing shop ie b&q mdp gas services