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    Vaillant EcoTec937 hot water cool after 10min...design flaw?

    David937 - that sounds exactly like I'd expect it to be :) Ours has the high flow rate at the start but then does not maintain it after the tank is exhausted. At least I have an idea of what 'normal' is then. Hufty - The engineer turned on storage tank charging via the front panel (so the...
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    Vaillant EcoTec937 hot water cool after 10min...design flaw?

    JoeMar, yes as water temp drops boiler is very much lit and actually appears to be pumping out hot water at the correct temp. The problem appears to be that the water is getting cooled by the charging tank on the way to the tap, which seems like a design flaw to me. The charging tank used to...
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    Vaillant EcoTec937 hot water cool after 10min...design flaw?

    Ok, I get roughly 9l per minute turned to fully hot. Boiler fires up when water is called for as expected and water temp gradually 'fades' over time. Looking at the boiler and feeling the pipe coming out I can see that the temp is bang on 63C but when coming out from the output of the boiler's...
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    Vaillant EcoTec937 hot water cool after 10min...design flaw?

    Thanks for all the replies folks. Difficult to give precise flow info on an existing shower head (it's a normal shower head, about 3 inch diameter, good flow) - I could measure the water out per minute into a bucket I guess to get a feel for the throughput, but then only a % of that will be...
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    Vaillant EcoTec937 hot water cool after 10min...design flaw?

    I have a 2 year old EcoTec937. If you run the shower all is well for the first 10 mins or so, then it seems as if the water in the charging tank seems to run out and the boiler does not seems to be able to keep up with recharging it quick enough so the water goes cold (not stone cold, but cool...
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