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Old 08-14-2011, 11:59 PM   #1
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Hot Water Overflow Leak

I have a 140L Copperflow Electric Heat Exchange hot water system, model 2895.
It is dated 02/2004.

In the last few weeks the 'Overflow' has gradually increased its leaking rate, to near a constant flow. (There is a mains tap before the HPNR valve and HWS so currently I am just turning this water feed on and off when requiring hot water.)

After various consultations, I decided to replace the 'RMC' HPNR valve, (around $130).

The leak now seems worse than ever!

Is there another possible cause to the leak?
Is the new HPNR valve likely to be faulty?

Thanks for any interest.


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Old 08-15-2011, 06:13 AM   #2
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Does this system have an expansion tank? If so see if it is defective.

Is there a pressure regulator /back flow/fast fill valve? Check to see if the valve is on fast fill instead of the normal operating position.

Hopefully a boiler guy will spot this one---Mike----


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Old 08-15-2011, 06:42 AM   #3
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Thanks Mike

No expansion tank, pressure regulator, back flow or fast fill valve -
it is a coil system that is immersed in heated water. The High Pressure Non Return valve is really two valves; for the heated water (not under pressure) and the for coil water (under mains pressure).
I now believe the coils are leaking into the heated reservoir surrounding them.
This causes the reservoir overflow excess leakage.
Simply, new system required.

Cheers for your time though.
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oh'mike (08-15-2011)

copperflow , hotwater , hpnr , overflow , rmc

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