Stuart wrote:

I have a floor standing Kingfisher ( very old one ) ,10mm piping and
rads with TRV's and a Primatic cylinder a few years ago i had a BG guy
out and he said that the rads and piping and TRV's wouldn't stand up
to it if I got a combi boiler fitted because of the pressure .I
questioned what he was saying as i couldnt see how these fittings
could fail but he was insistent ...I didnt get anyhting changed and
the boiler has lasted ever since altho' has probably cost me loads in
gas costs ..

Was he right in what he said .??

Possibly partially right for some situations! (that got enough get out
clauses in it? ;-)

Pipework and TRVs are usually fine at pressure (just think about you
mains water pipes etc).

Rads are also usually fine unless on the last legs - in which case the
pressure change may push them over the edge and you will get pinhole
leaks. However if this is the case they were due to do it anyway - you
just accelerated the process by a few months. For a system treated with
corrosian inhibitor on a regular basis this ought not happen anyway.

Old lockshield valves may weep when the pressure is increased. Having
said that there is no guarentee they will (the ones on my system were
fine when I converted it to sealed operation)

--
Cheers,

John.

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