would anyone know is a tall radiator with a btu of 3,550 lets ofF good heat it is only for a small dining area about 10 ft by 10 ft which has a double radiator in now, I have a small kitchen extension joined to this with no radiator that end of the kitchen which is about the same size as the dining area.. trying to work out the will it be warm enough it a bit of a head wreck not understanding these BTUS....when I put in the btu calculation it said 2 rads needed but it only has one now and another btu said 4500 something...