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I also would not use plastic pipe in CH systems even if recommended. My understanding is that oxygen can still diffuse into the system and the manufacturers of this pipe now recommend triple strength inhibitors in such systems. The advice to fit a Magnaclean is sound, it's amazing what they...

Sorry but you wouldn't get any heating from the flue. The inlet and outlet are concentric and the cold inlet is outside!! I think most boilers would be ok with this length.

You can use ordinary silicon or "plumba" sealant or somilar. Put it under the metal rim but NOT on the rubber seal underneath otherwise it will just extrude out when you tighten it. Also put some on the threads of the waste fitting or it will leak at that point

Anotherbgeng is correct. If you feel competent you can unscrew it inside the combustion chamber. You can clean it with air presure or if necessary fine (ie 5 amp) fuse wire. Put the combustion chamber front back on before trying. It wont work unless the correct pressure differential is detected.

A friend has a Sime HE 30 BF combi installed. The indicator strip on the left of the display is normally blue at normal pressure and red indicates low pressure. It is apparently flashing red but the pressure is 2 bar, the fault indication on the display reads "all 03" with no explanation in the...

I am an ex corgi reg engineer ( retired) so I may be out of touch. A boiler certainly could be installed in a bathroom providing it had a sealed balanced flue (they all have now). As previous reply, it should be out of reach of sink and bath and all supply switches etc must be outside the room...