I've just fitted a new designer radiator which refuses to get hot. Is there a right way and a wrong way to fit these. The reason I ask is that the "In pipe" gets hot as does the "Out pipe." The cross pipe on the radiator at the bottom also gets hot. It seems that the hot water comes in one side accros the bottom pipe on the radiator and out of the other pipe. I imagine there could be a baffle to force the water to circulate around the radiator before exiting. Could this be in the top ie could I have put it on upside down. There is no physical difference or markings on the rad itself. I've bled the radiator and am confident there is no air in it.
Any thoughts
TIA