Storage combi required mains pressure

Discussion in 'Plumbers' Talk' started by graceland, Nov 21, 2020.

  1. graceland

    graceland Active Member

    Hi, wanted to ask a question regarding storage combis, ie the Viessmann 111-W.
    The data states that the combi has a storage tank of 46 litres and can provide 18L per minute flow rate on the hot water supply.
    I simply wanted to ask does this then require a minimum of 18L per min coming in on your mains? For eg, if you only had 10L per min coming in on your mains, would you still get 18L per min from the storage part until it runs out?
    Thank you
  2. Dave does Gas

    Dave does Gas Screwfix Select

    You can only get out of any system whatever goes into it. So no you will only get 10ltr per min. I will ask though how did you measure the flow rate as a lot of modern taps restrict flow. Best place for measure with a weir guage is a garden tap
  3. graceland

    graceland Active Member

    Thank you. Yes measured at a garden tap but was just using 10 as an example

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