Re: Re: [OT] Thermal Stores for hot water/heating

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

That's good news - especially that spares are reasonably priced
...=20=20
'think latest models have a measure of self diagnostics - 'wonder if=20=20
that would have pointed to the failures ??

Chris


On 30 May 2007, at 11:11, ianh1000 wrote:

> Hi Jon,
>
> I have a Gledhill boilermate heat store, it is about 9 years old now
> and I live in a hard water area. I have had a few troubles with it
> but nothing major. The hard water did kill the Oventrop mixing valve
> after 6 years (=A370) and both PCB's have failed (=A335) each. I think
> they are a better design now than my unit. My unit is a very simple
> one PCB runs the HW pump for a few seconds every day so that it does
> not stick during the summer, the other runs the pump for 5 min after
> the boiler stops to pull out all the residual heat. both had failed
> relays but the new boards had better relays fitted.
>
> I am very happy with the performance of it, the high pressure hot
> water has caught a few guests out when they turn the bath taps to
> shower and the showerhead jumps out of their hands.
>
> I have noticed that Gritish Bas have removed a number around here (
> all of my local area has these units) and been working on the tank on
> the front drive. No idea why they would need to do that.
>
> I think that generaly plumbers do not understand how they work. My
> sister had a plumber out 4 times trying to fix hers, I told him 3
> times it was the external mixer valve but he knew better, on the 4th
> visit he changed the valve and the problem was fixed.
>
> The design is very simple so I am not sure why they don't like them,
> perhaps it is the fact that all of the plumbing runs at mains
> pressure so they need to do a good installation job.
>
> Regards
> Ian
>
>
>
>
>
> --- In ukha_d@xxxxxxx, "Jonathan Shaw" <semi.jon@...>
wrote:
>>
>> I read a lot about hot water cylinders before talking to plumbers
> and
>> decided that with underfloor heating + radiators & a
condensing
>> boiler that a thermal store was the best option as theory is that
>> even when heating the house (rather than water) the themal mass of
>> the heatstore gives the boiler something to work on and
>> prevents/reduces boiler cycling/ inefficiency associated with
>> condensing boilers and zoned heating whre only one room may be
>> calling for heat.
>>
>> None of the (getting on for 10) plumbers I have spoken to think
> this
>> is a good idea.  All generally vague reasons that seem to centre
>> on "I fit what I know" rather than listening to
customer; oh and
> the
>> annual service for the pressure relief valves needed for unvented
>> cylinders, nice litle earner.  One suggested in hardwater areas
the
>> heat exchanger would calcify, but Googling doesn't seem to back
> this
>> up.  Naturally eh suppliers (Chelmerheating, Nu-heat, Gledhill)
all
>> deny this is a problem.
>>
>> Are there any heating engineers on the list that can offer advice?
>> Or anyone with a thermal store in a hardwater area?
>>
>> TIA
>> Jon
>>
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