Reduced Hot Water Supply from Steam Boiler Domestic Coil

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ArtM1
ArtM1 Posts: 14
edited March 2025 in Domestic Hot Water

Water temp. at the faucet initially is very hot and soon turns luke warm and doesn't recover. A Honeywell triple function L6081A aquastat controller is used as a high and low limit . There is an adjustable mixing valve . The complaint is lack of hot water after a short initial supply of very hot water. Is this a mixing valve problem ?

Comments

  • Jamie Hall
    Jamie Hall Posts: 27,975

    Much more likely a scaled up coil in the boiler problem.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Intplm.
    Intplm. Posts: 3,160
    edited March 2025

    It can depend on wether you actually have a "mixing valve" or an older technology "tempering valve".

    Do you have a seventy series Watts brand tempering valve used with the coil?

    STEAM DOCTOR
  • Long Beach Ed
    Long Beach Ed Posts: 1,851

    You can ultrasonically clean the scale out of the coil with good success. One company offering this service is some areas is called "Hot Water Plus".

  • ethicalpaul
    ethicalpaul Posts: 9,075

    Compare their rates to the cost of a standalone water heater

    NJ Steam Homeowner.
    See my sight glass boiler videos: https://bit.ly/3sZW1el

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