vaillant ecotec 937 plus hot water

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    Vaillant ecoTEC plus 937 - hot water goes cold when running a bath

    Hi all. We have a Vaillant ecoTEC plus 937 combi boiler. It's about seven years old and was installed before we moved in. Been serviced every year and the only problem we've previously had was last summer when the hot water flow rate started to reduce - this turned out to be collapse of the...
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