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UFH downstairs rads upstairs - do I need new gas boiler?

  • 18-02-2015 9:49am
    #1
    derb12
    Registered Users, Registered Users 2 Posts: 503 ✭✭✭


    I'm about to start a 20sqm ground floor extension with retrofit of existing downstairs for improved heat retention in my house.
    Basically I am removing the suspended floor in the current kitchen/living area and replacing it with an insulated poured concrete floor. The new build will also have a solid concrete floor. On top of my new concrete slab, I'm considering going with UFH instead of the rads I have now.
    However, I want to keep changes in the rest of the house to a minimum so will be keeping my rads there.
    The question is: do I need to change my gas boiler? Is my conventional boiler ok to run UFH off? It is a Volkera Mynute 20-70 SE.
    I know I'll need a mechanism to have water at 2 different temperatures going to the different heating systems but need advice on whether I should change the boiler from someone who isn't trying to sell me a boiler.
    Thanks in advance!


Comments

  • #2
    Pete67
    Registered Users, Registered Users 2 Posts: 1,257 ✭✭✭Pete67


    If the output of the existing boiler is sufficient for the total heating load (existing plus new with an allowance for DHW) then you should not need to change it. The UFH circuit can be provided at low temperature by means of a mixing valve, circulation pump and suitable controls.


  • #3
    derb12
    Registered Users, Registered Users 2 Posts: 503 ✭✭✭derb12


    That is great, thanks!
    The boiler was actually overspecced (not a good idea efficiency-wise I now know) for the original size of the house, so it should be perfect for the new volume. I will redo the calculations just in case.


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