Evening all. A customer has had a conservatory built about a year ago and with a small electric heater, heating it. He now wants it taken out and a radiator plumbed in. The room measures 2.7 x 2.3 x 2.3H with a slight pitch to the roof. The wall the rad will hang on is brick but the other 3 walls are glass aswell as the roof. I've never had to size up a radiator in a conservatory before and don't want to undersize the rad and he says it's too cold in the winter. I know the room will never heat up and hold the heat like a traditional room with 4 solid walls but would just like your advice. Many thanks in advance.