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Combi boiler - minimum pressure and flow ?

Discussion in 'Plumbing and Central Heating' started by damtom, 28 Mar 2021.

  1. damtom

    damtom

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    Hello.

    Just recently had replaced mains water supply pipe , from lead pipe to 25mm mdpe. It is 3 storey building. On third floor i am getting static pressure of 1.9- 2.0 bar. Once tap is fully opened pressure drops to 0.9-1.0bar but flow is quite high as it is over-filling my weir cup which is max 22LPM. I am guessing flow is even higher but i need to do another test with accurate bucket.

    Question to experienced plumbers , are these condition good enough to install combi boiler, i am bit worried about low pressure.

    Previous system was vented hot water cylinder with cold storage tank.

    Also is it worth going into high end boiler , I had in mind Ideal or Vaillant their premium range ?

    Thank you
     
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  3. muggles

    muggles

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    22l/min is more than any standard combi can deliver, so that'll be fine. Maybe the real question is whether a combi is actually suitable for your house? Would you not be better off with an unvented cylinder? How many bathrooms do you have?
     
  4. dilalio

    dilalio

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    How far are you in with the "Awakening" Andy? ;)
     
  5. damtom

    damtom

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    Thanks.

    Just one bathroom with walking in shower. Unfortunately there is no space for unvented cylinder anymore.

    I have noticed screwfix offers some cheap boilers with stainless heat exchanger e.g. ariston or baxi. Are they any good or should i forget about them and go for brands like Vaillant or Ideal?
     
  6. muggles

    muggles

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    Got one eye open but I'm still horizontal with the duvet on :ROFLMAO:
     
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  7. muggles

    muggles

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    Have a look at the Intergas Xclusive 36. Also remember that a good installation is as important as a good boiler.
     
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