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Hi. Please, can anyone tell me what the valve is on the rightside pipe going from the top of my boiler? (Obviously the opposite pipe on the left has a drain off valve). Out of interest, is there a way to know which is flow and which is return? For info, my boiler is in the kitchen, with the...

Hello. I'm having a problem with my central heating that I hope someone can help me with, please. I have checked the wiki and forum and cant find the answer, so please forgive me if i have missed it, but I'm pretty sure I havent. In summary, I have replaced a radiator with a towel rail...