I've balanced my CH system using one of those IR thermometers, resulting in all of my rads heating up together quite nicely. I've adjusted the valves down to the settings I require, but one or two of the radiators I need on full setting. Typically speaking, what would be the maximum temperature the radiator should heat up to, on a presurised system? I'm reading 72-74C at the top of the rad, but I thought this should be more like 80C? Cheers.