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I'm fitting a new thermostatic radiator valve. My central heating system uses 8mm microbore piping, the thermostatic radiator valve comes in 15mm size only. I've got a 15mm to 8mm Int Reducer set (compression fitting) only I'm not sure which part of the 3-part Reducer set goes where and in which...

Here's one to get u thinking!! :D I run a basic open type gas fired central heating system with boiler (with stat), rads, room stat, 3 way motorised valve, cylinder (with stat), pump and a wiring centre box. There are 2 probs (may be connected, may not). 1. When the system is running hot...