On 08/12/2016 14:46, John Rumm wrote:
On 08/12/2016 08:50, Martin Brown wrote:
Help! Local charity had one of these installed by well meaning cowboys.

Just been to take a look. It has plastic screw threaded fittings on the
top in blue and red for water in and out. The guy who put it in must
have got both on cross threaded first time around and then over
tightened to try and stop it leaking. Several people have tried to sort
it out since with no success. They have already had two biggish floods!

Someone else has put them on properly threaded and then over tightened
them even more. It still leaks at a level where after an hour about 0.1L
escapes. Both hot and cold sides are compromised but hot is worse. There
are rust marks running down the side from the connectors.

This might be irrelevant but it is rated 2.2bar maximum pressure but I
am told as originally installed it was set on 3bar (despite what the
rating plate said). Will this have done any permanent damage?

What was set to 3 bar?

The pressure on the cold side going into the heater. There is an NRV,
pressure reducer and expansion bellows on the feed as well as a pressure
gauge. Rating plate says 2.2bar max but the manual you have found for me
online seems to say 4.2bar max. Much like fig D.

If the unit has a 2.2 bar max rating, and the supply pressure is higher,
then you would typically need a pressure reduction valve installed
before the heater.

Local water pressure is 4bar daytime rising to about 6bar overnight.

I hate plumbing but I am the best chance they have of getting a repair
for free - otherwise they will be buying an entire new unit (again).

Its not entirely clear what type of fittings are on there... if they are
threaded stubs, then it sounds rather like they were intended to take
tap connector style fittings. However you later mention compression
fittings. These could be compression tap connectors I suppose - but in
which case which joint is leaking - the compression fitting onto the
pipe, or the tap connector onto the heater?

It looks to me like the tap connectors onto the heater. The actual
configuration is a bit weird and seems to use one of every possible kind
of connector including a flexible. I'll take a picture next time.

--
Regards,
Martin Brown