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hi looking for some help with a ongoing problem with a customers vokera/sabre 29he initial problem, rads not heating up properly, found 8mm micro kinked in several places under floorboards and at manifold, have replaced all copper microbore and manifolds, heating is rising to max of 22oC and...

Ide be ashamed in giving any body advise to fitting a isolation valve to hw draw off dickheads like you give half decent engineers a bad name...back to college son and decide if you were taught to fit these valves to a cylinder I wasnt

So whyat would be the problem in fitting a temp swing non return valve. Of course in your professional opinion

James this has been solved as suspected faulty mixing valve, sorry pal but irs a no no to fitting any isolation valve to hw draw off ....basic common sense hope youve not fitted any. Or it raises eyeyebrows why you would be giving out dangerous suggestion ...not rocket science

Thanks Daniel

James ive been time served since 1984 appreciate your thoughts but ive never fitted a gatevalve or isolation to anywhere on the dhw draw off of my poss 1000 hot water cylinders...just not the done thing mate but unless your only suggesting for investigation purposes.

James bear in mind were not idiots only looking initially for other possibilities that we have overlooked. ..I know what volume means

Ok give me your best theory james 144l and storage is 150gallon fed with 28mm copper No pumps fitted

Direct cylinder james..thanks

Its a hotel with 3 extensions 1 of which we had no access to...if thats ok with your approval

Oh sorry but we had another extension to the hot water supply that we found out about

Thanks guys problem sorted. .faulty shower mixer valve ...

thanks gasguru will let you know results on tuesday

only emerges when no water is drawn but can take up to 20 mins , expansion of water is usualy 10% we have allowed for this and lowerd the level of ballcock in cws and it still was rising to overflow

its a direct cylinder so no coil fitted

gasguru water shouldnt be expanding up via feed pipe as this would be seen under contamination ofwater this is only reason for non return being fitted, might add that this was the original problem that cws was filling up, it will be removed when problem has been sourced, there is no restriction...

sorry forgot to add that the only reason for the swing type non return valve was that there was the backflow of water coming back into cws and making the water level rise that far it was coming out overflow pipe, hence that the problem has shifted to expansion pipe.

thanks gasguru the non return valve is fitted just after gate valve on cws and not near cylinder, cws is 150 gallon as it is in a small hotel, no other mixing valves apart from 3 monobloc mixers with washers replaced, the cylinder is fed from a single 28mm copper feed straight to cylinder, hot...

Might add that we've also replaced ball cock on cws,

Hi Daniel thanks...all cold feeds to taps and showers are mains fed ..I thought that the cwsfeed to ccylinder is 28mm might have a impact on outlet pressure at draw off on cylinder do you think it is possible to raise expansion pipe higher , even although ive approx 5/6 ft from top of cws to...