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as anyone will say we can't see the job. i could tell you you need a pan connector. now without seeing the layout there are about 15 different types. you need a basin trap. what ones going to fit your layout best. a bottle trap, a straight through, a tubular swival. now there is about 20...

it's sounds like it's not shutting fully when heating not called for. if from cold your hw is calling for heat does the rad side of valve heat up ?

sounds like a sticky motorised valve if it's a system boiler set up

how do we know what you want ? don't know what bath suite you have. can't see the job. they should know more as they have been to price the job.

where do you live on the roof. :lol:

have to agree with ollski on this one. so best i rush out tomorrow and order a new combi and fit monday night as my boiler has been in since the 80's and never know may breakdown. another person trying to con the public and turn one job into a weeks work every shower i fit i don't try and...

why you running a seperate feed just install pump in the original pipework. and the pump has flow switch fitted.

thats the wrong way to do it. :wink:

sounds like a block on the return. try shutting all but one rad down stairs and remove the trv thermostatic adjuster on that rad. see if that one heats any better. if it does try the next.

in that short distance if it's going straight out the wall in to the soil stack not a problem as the flush will push it that distance . it's when you have a run you can get probs and need a good drop. :wink:

18mm/m min drop.

it's a vokera option

try the manifold where it's 22mm to 8mm. maybe just air in return side or even slight block that putting all the flow downstairs may move. or add some cleaner to one off the rads and let it circulate for a while.

could be a blockage in return, balancing. try shutting all the rads upstairs and leave rads open down stairs. just shut all the trvs to 0

blockage, sludge in system. pump speed high etc. as it's getting worse i would put it down to crud in system , check the bottom of the f/e tank.

where is the boiler up or downstairs ?

never had one fail yet due to installation problem. and don't use the cheap isolation valves with about 8mm bore get full bore valves. and if you fit any non-return valves never fit before the pump always after the pump. :wink: have you got a pump already?

as long as your pump is below your cws in loft and you have bleed the pipework at the highest point your only going to get air back in if the cws emptys etc. many pumps are installed in the loft as shower pumps push water not pull

then move the pedistal out abit when you need access they only rest on top.

http://www.plumbworld.co.uk/images/pwmf0001l.jpg bi directional