On 08/12/2016 16:38, Martin Brown wrote:
On 08/12/2016 15:52, John Rumm wrote:
On 08/12/2016 13:34, Martin Brown wrote:
On 08/12/2016 12:35, MrCheerful wrote:

Is it one of those Ariston ones? My one lasted just Three years before
springing a leak, it was not from the actual connector joins, (which
were tricky to sort out) but one of the pipes itself had pinholed,
ruined the new cupboard it was in too. Guarantee was only two years.
When I replace it I will get a heatrae instead. So if it is Ariston,
just chuck it and start again

Its Hyco with 15L reservoir (which isn't really enough). Its not an

Ah, ok that looks like a small unvented cylinder rather than an electric
instantaneous heater which is what I was expecting.

It is also what I would have preferred given the situation.
Any recommendations for a reliable model in case it proves to be a lost
cause fixing the existing broken installation?

These?:

http://www.hyco.co.uk/products/hot-water/speedflow

If so the install manual suggests that the PRV is only required on
supplies above 4.2bar:

http://www.hyco.co.uk/downloads/Spee...57-no-crop.pdf



It looks exactly like that but the rating plate definitely says 2.4bar
rather than 4.2bar! I wonder which is the misprint?

Next time I'm there I will check the model number in case there is a
cheap and nasty one that only works with low pressure supplies.

The connectors are tap connectors, so as long as there is a sealing
washer fitted, and they are tightened against it, they should seal. The
ends of the plastic stubs can be sanded flat again if they are scored.
Obviously the misthreading in the past may have hindered getting them to
pull in tight enough.

I haven't taken it apart yet. I wouldn't put it past them to have
omitted the sealing washers in favour of over tightening it.


There is a big difference between a Pressure Relief Valve and a
Pressure reducing valve. a Pressure relief valve is mandatory, just in
case the thermostat goes.