Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss Instantaneous Water Heater advice in the Plumbing Forum area at

  1. Dan Wright

    Dan Wright New Member

    I would like some advice on an Instantaneous Water Heater that can provide hot water for a bathroom sink and a kitchen sink (1 heater, 2 appliances). The hot water pipe length from the heater to each appliance is roughly 2 metres.

    This will be for a small outbuilding and so the bathroom sink will be very small although the kitchen sink will be standard size.

    Any suggestions on a heater or wattage necessary that will suffice to supply a reasonable flow rate?
  2. Rob Foster

    Rob Foster Top Contributor!!

    You need to refine your requirements , Gas or Spark
    Rob Foster aka centralheatking
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Unvented undersink water heater around 15-30l
  4. Rob Foster

    Rob Foster Top Contributor!!

    Ok missed that chk
  5. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Ariston units are good but it will depend on your planned usage. Crown make some slightly larger stored hot water solutions
  6. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    The Ariston units are cheap and cheerfull , for the money , theres nothing wrong with them
  7. SimonG

    SimonG Trusted Plumber Top Contributor!!

    I like the hyco units. Never had a problem when fitted correctly.
  8. WC1

    WC1 Active Member

    Last edited: Dec 4, 2018
  9. chris watkins

    chris watkins Plumber Top Contributor!!

    Dan are you sure you want an Instantaneous water heater or as most seem to be suggesting a small storage multipoint?
    You will get very very poor flow rate & have to run a large cable if you go for instantaneous.
    15Litre 2-3kw is the minimum for one kitchen sink, if there is not much chance of them being used within 30mins of each other, that should do. If not go larger with the storage capacity only.

    New Heatrea eco multipoint look good they have intelligent elements & good insulation which might help.
    • Agree Agree x 1
    Last edited: Dec 4, 2018
  10. Murdoch

    Murdoch Active Member

    If you go down the electric route, what supply capacity do you have to this outbuilding ?
Similar Threads - Instantaneous Water Heater Forum Date
Water surge up through toilet after water company did routine street cleanse Plumbing Forum Yesterday at 3:21 PM
Mains water upgrade .. Plumbers Arms Yesterday at 9:52 AM