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Will a Flow Restrictor solve my problem

Joseph_4 Member Posts: 268
I have a customer with an oil fired boiler with a domestic coil. They have complaints that shower not maintaining temp. properly. I went to the property and see that it stays on a comfortable temperature for about 2 to 3 minutes, After that, I then needed to turn it further in the hot setting to get it comfortable again. Otherwise it is already somewhat cold. and this continues like this.
Would a flow restrictor on coil help them have a more steady shower?
HHI Services LLC


  • Harvey Ramer
    Harvey Ramer Member Posts: 2,239
    The domestic coil may need to be flushed. If you look at the manufacturer ratings, they should tell you how many gpm of hot water it will produce.
    EBEBRATT-Ed Member Posts: 14,560
    A flow restrictor will probably help but we need more information:
    Steam or water boiler
    If steam is the boiler water level covering the tankless coil
    The coil may need cleaning as @Harvey Ramer said
    what temperature is your boiler water
    does the coil have a mixing valve and is it working properly
  • Jamie Hall
    Jamie Hall Member Posts: 22,184
    As @Harvey Ramer and @EBEBRATT-Ed have noted -- if it worked some time ago, but not now, I'd bet on the coil needing to be cleaned. Either inside or outside -- or both.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Joseph_4
    Joseph_4 Member Posts: 268
    It its a steam boiler and coiler definitely not totally covered. Not a proper mixing valve. .. He has multiple tenants and just bought property... I know I'm jumping ...would he be best off with a booster tank.. or do you all think we could get coil to do job for his multiple showers?
    Has like 4 to 5 showers.
    EBEBRATT-Ed Member Posts: 14,560
    Look into adding an indirect or another type of hot water heater.

    A tankless coil will not satisfy multiple tennants