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Combi water flow too high?

Discussion in 'Plumbing and Central Heating' started by new_DIYer, 25 Jul 2017.

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  1. new_DIYer

    new_DIYer

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    Hello,

    Just had a new kitchen and the installer replaced and worked on the water supply into the house. This resulted in a new stopcock.

    I live in a fairly big house and prior to the work the water flow was "acceptable" but not the best I had seen. The boiler delivered consistent hot water even with taps on full flow.

    Since the work, the water flow is so much better and the showers run perfect. However, the combi boiler seems unable to keep up with the flow (Glow Worm Ultracom 38CXI). In the showers it runs hot for a few seconds burst then tails off before warming again. The kitchen sink tap also does the same.

    Am I better off reducing the flow at the main stopcock in the street, the stop cock in my house or reaching the flow into my boiler? A crude test of flow shows it takes 7 seconds to fill 1L from the cold tap closest to the stop cock.

    All or any advice much appreciated.
     
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  3. flameport

    flameport

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    The flow through the boiler should be adjusted to provide the desired temperature rise. Not the entire house.

    8 litres per minute at full flow? That's either completely wrong, or your water supply is next to useless.
     
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