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Thread: Under floor heating settings?

  1. #1
    Craftsman
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    Under floor heating settings?

    We've had wet under floor heating in our kitchen diner for about 6 years now, and apart from a couple of minor problems I've not had to touch it for a few years, so today i thought I would look inside the cabinet where the manifold etc lives, ( I know, i live an exciting life ), lol.
    Anyway, just want to check that all the settings seem right, flow temp is set at 50 degrees, pump speed is on 2, and the system pressure is just under 1 bar, should the pressure be slightly higher?

  2. #2
    Master geran's Avatar
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    Is the pressure directly related to your boiler pressure ?

    I'm literally about to change a pump on our UFH, four manifold system for a building, runs at 6 bar from memory, as this is the pressure for the closed water heating system.

  3. #3
    Master
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    1-1.5bar should be ok.

  4. #4
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    There is approx .5 bar difference between the boiler gauge and ufh manifold pressure gauge, I've just increased it slightly to see what happens, boiler is running 1.7 and manifold is reading 1.2 bar.
    I should add that the UFH is currently calling for heat so the boiler is running.

  5. #5
    Master
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    Iíve found ours to be more effective with the pump speed on 1

  6. #6
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    Quote Originally Posted by bootneck View Post
    Iíve found ours to be more effective with the pump speed on 1
    When you say, "more effective", in what way, heats the floor up quicker?

  7. #7
    Master
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    Quote Originally Posted by Weirdfish View Post
    When you say, "more effective", in what way, heats the floor up quicker?
    Yes the room warms up faster because the water is moving slower has more time to dissapte heat into the floor is the way it was explained to me and it's made a noticeable difference.

  8. #8
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    I might try it, but the area we have is quite large, the furthest point away from the manifold is approx 12mtrs and we have 4 individual runs in the floor, all working off the same manifold though.

  9. #9
    Master
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    Quote Originally Posted by Weirdfish View Post
    I might try it, but the area we have is quite large, the furthest point away from the manifold is approx 12mtrs and we have 4 individual runs in the floor, all working off the same manifold though.
    The area Iím heating with mine is 50sqm so pretty large, itís worth a try and see if itís an improvement for you.
    it was for us made a noticeable difference in how fast the room warmed up. Doesnít cost you anything to try .

  10. #10
    Quote Originally Posted by bootneck View Post
    Yes the room warms up faster because the water is moving slower has more time to dissapte heat into the floor is the way it was explained to me and it's made a noticeable difference.
    If the waterís the same temperature wonít make a difference how fast itís moving.

  11. #11
    Master
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    Quote Originally Posted by Kingstepper View Post
    If the waterís the same temperature wonít make a difference how fast itís moving.
    The slower itís moving the more time it has to transfer into the floor is the way it was explained to me I can only say there has been a noticeable difference in the time taken for the room to warm up.

  12. #12
    Quote Originally Posted by bootneck View Post
    The slower itís moving the more time it has to transfer into the floor is the way it was explained to me I can only say there has been a noticeable difference in the time taken for the room to warm up.
    If it doesn't have time to transfer into the floor, more water will be along to do so.

  13. #13
    Master
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    Quote Originally Posted by Kingstepper View Post
    If it doesn't have time to transfer into the floor, more water will be along to do so.
    That was my theory too but I tried it on a lower setting for a week and noticed the difference so itís stayed on speed 1, thatís all I can say really is it has made a noticeable difference and for the sake of pressing a button and seeing what happens for a week or so you can see the results for yourself as to whether it effects your system in the same way.

  14. #14
    Grand Master Chris_in_the_UK's Avatar
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    Quote Originally Posted by bootneck View Post
    That was my theory too but I tried it on a lower setting for a week and noticed the difference so itís stayed on speed 1, thatís all I can say really is it has made a noticeable difference and for the sake of pressing a button and seeing what happens for a week or so you can see the results for yourself as to whether it effects your system in the same way.
    I depends on what the speed settings on your pump equate to TBH.

    Our manifold has 3 zones on it, each has an adjustable flow valve/meter so the flow can be regulated individually. In general terms, the larger the run of pipework under the floor, the bigger the flow rate needs to be.
    When you look long into an abyss, the abyss looks long into you.........

  15. #15
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    I have 12 runs which covers about 180sqm. Pump on setting 3 and flow rate at 45 degs. I donít seem to have a pressure reading dial at my manifold.

  16. #16
    Craftsman Nuisance Value's Avatar
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    I have 4 zones with 8 runs feeding them (1 zone with 4, 1 with 2 etc), boiler set at 1.5bar and the manifold thermostat set at 42 deg C.. Can't see a pump speed on the pump, but it all seems fine at that.

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