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I cannot see any valve on the expansion vessel which is tucked away at the very back of the boiler and is very innaccessible, the manual descibes it as a sealed unit expansion vessel, indicating it cannot be repressurised, this is why I have concluded I must fit a new additional one, thanks for...

:? Thanks Oilman, I guess what I was asking was if anyone knew a volume figure for a CH system in a typical or average 4 bedroom house. Alternatively what typical size of CH expansion vessel is seen in your average 4 bed house? To calculate the figure by adding up all the radiators and guessing...

Happy new year all, Can anyone advise me on what size of expansion vessel I need to fit? I have a Vokera 80-20 RS Turbo combi boiler and I have concluded the sealed unit expansion vessel has gone as the cold to hot system pressure ranges from 0.5bar to 2.7bar. If I top the system up then the...

Thanks Jason, I am rapidly reaching this conclusion, the only other thing I can think of is to mount the tap into a new hole and blank off the old one with something. This might be cheaper if I can find a suitable blanking plate in chrome or stainless.

If you have a header tank supplying the heating system, then yes, if you bleed a radiator the level in the header would drop, ball valve would operate to refill.

Even if the thermocouple has gone, the pilot should light whilst you are still pressing the gas valve button, it would then go out when you try to let it go. It works this way so the thermocouple has time to heat up before you let go.

I have been asked to fix a kitchen mixer tap with a body base diameter of 55mm. The problem is that the hole that is drilled thru the worktop is 55mm! Hence the tap has nothing to sit on and the horseshoe locking washer underneath has nothing to bite onto! I could bodge the washer underneath...

Which wall is the external wall? I would run the shower waste in a separate run through the external wall and connect into the waste stack outside. The route must ensure you dont have to cut through the joists too much for strength reasons. I installed a similar quadrant shower at floor level...

I have been advised in the past that a sealed pressurised system does not require any additives as the lack of oxygen will prevent any corrosion, what is the view of people here? :?:

Thanks Oilman, Fitted a PRV preset to 3 bar, shower turns on and off smoothly now, problem solved!

I have a Mira Thermostatic Mixer shower valve which is very stiff to turn on and off. If I turn on the cold water tap at the sink first, the valve will turn easily. I have therefore concluded it is a water pressure problem. The problem has worsened since I had a new supply to the house...