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Heating and cooling: Underfloor heating to 25C on buffer tank

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  1.  
    • CommentAuthorhomdogs
    • CommentTimeSep 5th 2024
     
    So we have a new UFH system with a wood gasifier/boiler for fuel. The guy who installed the system said we need to heat the water in the buffer tank to 60-70C. It occurs to me, however, that most of the water, for the UFH, is only needed at 25C, and a minimum of water, for showers and at the sinks, would be needed at 60C. Wouldn't it make more sense to have a separate on-demand boiler for showers/sinks and only heat the UFH water in the buffer tank to a much lower temperature, say around 30C?
  2.  
    I have a wood gasifier boiler and a buffer tank. (40kW boiler and 2000 ltr. tank) I batch burn the boiler to get the buffer tank to between 80 - 90 deg. and mix down to 60 for DHW and 50 for CH.

    If you only heat to 30 then you won't have much energy (heat) in the tank which will mean more frequent firing. Also the boiler should not be run below about 70 so if you only heat the tank to 30 the boiler Laddomat (or similar, - you do have one don't you ??) will do a lot of recirculating to keep the boiler temp up.

    If the system is setup correctly the tank will have a temp. stratification which will preserve your hot water. Your pipework should be fitted so that the DHW comes from the top of the tank and the CH lower down so that the water at the top of the tank is reserved for the DHW. (usually the DHW will take its heat by some sort of heat exchanger)

    On my system I have a separate indirect DHW tank which is heated from the buffer tank controlled by a differential thermostat so that the DHW tank is only heated when the buffer tank is 3 deg. hotter than the DHW tank
    • CommentAuthorhomdogs
    • CommentTimeSep 6th 2024
     
    Peter,
    Thank you so much for commenting on my question. This is my first winter using this system.
  4.  
    Is the buffer tank easily visible within the house? If not it would be worth fitting a thermostat controlled small light that is visible easily so that you can readily see when you should light the boiler. Because my system is in a boiler room I have 2, one at 2/3 up the tank and the other at the top. The first says light the boiler soon and the one at the top tells me to do it now!

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