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I don't quite understand why the original frost stat in the loft would still be required? doesn't it do the same job as the pipe stat? wouldn't you want the pipe stat to just work whenever it was needed (ie. when the pipe gets too cold) regardless of what the original frost stat is doing...

cheers for the reply, but I think you've lost me :oops: so I need a frost stat on the pipe to turn on the heating when it gets below a certain temp. also need another normal? stat on the pipe to turn off the heating when they reach a certain temp. is that right or have I misunderstood...

hi all, there is a frost thermostat in my loft and it is most annoying. I believe it is badly positioned. when it gets cold, as it has been of late, the froststat overrides the normal controls and fires up the heating. I guess this is what should happen to avoid the pipes freezing...

by drain cock, do you mean the tap on the lowest rad (the one used to drain the system)? I guess it must be that, then it would force the system to refill from the F&E tank and get the X200 into the rads. any idea how much to drain? I'm an upstairs flat so it's a bit of a pain to drain...

good stuff - I've just got "beginners nerves" ;) will give it a go... cheers for the advice everyone!!

ok, so once I've found the F&E tank I'll need to prop up the ball valve and empty the water and any gunk in there by hand. then I just need to pour in the X200 stuff and allow the tank to fill again by releasing the ball valve? sounds too easy... :?

cheers, that stuff looks good! any clues as to how I can Identify the F&E tank? I'm pretty new to this plumbing stuff...

hi guys, my boiler gets pretty noisy as it heats up - I've never thought of this as a problem, until reading this forum lol. I think this is kettling? it does sound like boiling water. I read in the FAQ section that the first thing to try is some Fernox stuff, is that right? is there...

Boiler: Stelrad WRS 450 Room Thermostat: Honeywell Control Unit: Honeywell ST6400C 3-Port Valve: Myson MPE322 Hi guys, The hot water appears to be working ok. However, when the heating is meant to be on, the boiler does not fire. I investigated the 3-port valve in the loft - when I...