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Mar 23, 2019
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DIY or Homeowner
Hello - and thank you in advance for your help on this one.

We have a Salamander Homeboost pump fitted to the mains supply to our flat. We have tanked hot water which is heated by our Valliant Ecosystem 30KW boiler. The flat has 3 bathrooms upstairs, 1 downstairs and kitchen taps.

When the Homeboost pump is on, we check the temp coming from the tank (37C) and when we disconnect the hot tap from the kitchen mixer tap and check the temp it is 16C. The same is true for one of the upstairs bathrooms. The problem seems worse for the bathtub where there are dedicated hot and cold taps compared to the mixer tap for the shower.

When the pump is not turned on, the temperature in the kitchen and affected bathroom is Ok - but not as good as the hot temperature from the other 3 bathrooms.

We think that the issue may be a mixer tap that is allowing the hot and cold to intermingle. But we don't know how to trace this to identify for sure.

According to Thames Water we are in a Pressure Managed area which means our water pressure is fine daytime, but that in the evening Thames drops the pressure and then we need a boost.

Any help is diagnosing this problem is much appreciated. Thank you!
 

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