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could be either,depending on installation practice or local water bye laws.i work at a hospital and all water to the wards, clinics and kitchen is fed via one large external tank and boost pumps.

yes pipes are o.k touching.try turning a couple of rads off that are working and if the problem rads get warm your system could need balancing,if not you could have air trapped in the pipework somewhere.

been off a few days but just read all the replies,thanks for all the ideas we are looking into it and i'll let you know what we find.

yes,does that make a difference to the boiler noise?

no,thats the thing the hospital has been constantly added to and extended since the seventies,the pinholes are appearing on pipework in different areas and fitted at different times.the quality of the water is still the same as it has always been we carry out routine sampling for hardness and...

i work on maintainance for a health authority based at a medium sized hospital in north cheshire.we've been getting a lot of pin holes in our copper pipework,three in the last two weeks alone.theres no similarity in the age of the pipework (late seventies to late nineties)i was just wondering if...

boiler noisy when first fired up,quietens down when up to temp.flushed out system all rads working o.k. adjusted gas pres. down to minimum setting,check gas rating o.k. heat exchanger and baffles clear.any ideas?

ive fitted a new exp. vessel on the return pipework and charged it to one bar.ive been working as a plumbing and heating engineer for 17 years and ive not come across this before,i was wondering if anyone had encountered this on the same boiler because its got me beat!

pressure set at 1 bar

yes loop disconected,thought about heat ex. but pressure o.k. when boiler stood, only rises when ch. is on.heating is circulating o.k. so dont think its a blockage anywhere.cant think of anything else!

i have a problem with an icon 23t combi,pressure rising when in heatihg mode and lifting the prv.prv already changed last week by another engineer but didnt solve the problem! changed the expansion vessel for a larger one and fitted it in the return pipework (it was the only one i had to hand)...

check the pressure in the expansion vessel with a tyre gauge when cold. if there is no air in the bag the hot water has no where to expand to and eventually goes over pressure and discharges.if the pressure is down top it up to the maufacturers recs.(1-1.5 bar normally).

try your local plumbing or bathroom merchants,all the ones i have seen in b+q etc. have a connection for hot and cold as both supplies to a shower with booster should come from a tank.

possibly, if you could find one with just a hot water connection as you cant run cold mains water through a pump(bye law 13).i think it would be easier to change the tap.

i have had this problem before,most of these type of taps are made abroad for pressurised systems.the only thing you can do is replace the tap with one suitable for gravity systems( or fit a combi or unvented system).

have you checked the balltap washer in the feed tank ive come across a lot of these making a noise when filling.

you don't have to turn off the mains to drain a sealed heating system,just drain through a drain tap which should be fitted low level on your heating system.if there is not one fitted you could drain upstairs via the safety valve fitted to your combi,just give it a twist and wedge it open then...

had a similar prob with a baxi 80 eco. constantly resetting and no gas to burner ended up replacing circuit board and problem solved,may be worth a look.