Underfloor Heating — The 2 Big Questions

Roger has some answers for the most common questions from Skill Builder viewers.

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#ufh #underfloorheating #heatingandplumbing

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[elslopez]

I replaced all the heating in a 120 year old house with under floor, every single room up and downstairs, over 3km of pipe work. The high ceilings meant rads were next to useless and the floor was like ice anywhere round winter time, so now no rads in sight and I can say under floor is excellent, it is night and day levels of difference even when compared with particularly good rad systems. Highly recommend if you can. Manifolds also will allow you to easily add zones so the heat distribution can be controlled per room!

[rush]

I installed underfloor heating in our kitchen extension three years ago, and I can honestly say, it’s the best thing we ever did .
Our heating comes on at 6 in the morning for an hour or so, we set the thermostat at 19 . But due to the tiled floor being like an enormous storage heater, by 9am the temperature is over 20 degrees, and stays like this all day . Fantastic

[gdfggggg]

I get in a right old kerfuffle thinking about all this stuff. One day the building inspector say’s do this, the next inspection another ones says don’t do that. Live off grid and do what I bloody want I reckon 😂. Cheers Rog.

[johnf]

My mate has underfloor dowstairs. Its great. 19c in his house feels warmer than 19c with our radiator system because the heat is rising from the floor, as it should do, not accumulate near the ceiling

[davidianwalsh]

When I built my house I installed a full underfloor wet system from Nu-Heat, can’t fault it - just fantastic - I’ll never go back to a radiator system!

[xdil]

Are bless, your never alone because we are right behind you . Yes a complex subject, yet with sound advice from you there can be light at the end of the tunnel . Best wishes and kind regards my dear friend, and may you continue to give sound advice to your many followers . 😀👍👍👍

[Cruner]

I have underfloor heating to 3 floors for 15 years and the designers got it spot on because I have measured all the rooms in all weathers I totally agree with your accounts. In my system it is set on a very thick concrete raft and then 50mm of insulation set in a self levelling anhydrite screed. I think they did great job in the design since all the wall, floors, ceilings and windows were calculated for thermal distribution. The first floor ceilings were a Bison hollow core slabs across the whole width of 8 m span insulated and covered with the pipes embedded in the anhydrite screed. incidentally the pipe are just 10mm fast flow diameter that I held some reservations about but proved they got it right since there is more mass in the screed to act as a heat store rather than water and plastic. still not sure about that but hey oh it works. With the tiny condensation gas boiler it has been a dream to live in. Love your video as usual.

[Itchytriggerfinga]

I’ve done the same in my last house and my current one. It works brilliantly.

[RHD]

Really useful! Thank you.
I like your pinching the return off the radiator idea.
My elderly set up sort of has this by accident because they didn't insulate it.
Consequently there's a few hot spots on the floor in the bedroom and bathroom where the radiator pipes warm up the carpet/lino that I've got into the habit of aiming for on cold mornings as it's sort of accidental underfloor heating.

[Tensquaremetreworkshop]

Some great stuff in this! I agree that a hybrid system has a lot going for it- background heat with rapid response to peaks. My son fitted 270mm insulation below the screed, but with a wood block floor finds having high output rads great for quick adjustment of ambient. He has a data link to the combi boiler (had to go to a foreign source for the data structure- UK not keen on divulging this) and wireless links to all rads etc with full flow and temperature monitoring, and links to weather forecasting. Had to design/build it all himself- because a commercial version is not available! Like most of building practice, we are still in the last century...

[uptwisting]

I removed all my radiators and stuck in UFH, which is heated by my 30 year old Netaheat Profile boiler. The boiler does cycle but we used to run the rads for 2 hours in the morning and 2 hours in the evening to get us warm for those periods. Now, we run it for 2 or 3 hours in the morning and again in the evening and the house stays warm all day and night. Turned the boiler down to 55 degrees, UFH runs at that temp too, 120 year old timber floor using spreader plates and air tight suspended timber floor.
It has been a surprising revelation.

[markatchison]

I have underfloor heating downstairs. I put down 3" Kingspan, ran the pipes & 4" concrete over that + tiles.
I didn't insulate the lower area of the walls (mistake). I lose heat by it radiating outwards through the walls.
Silly me. My floor level runs straight out onto a patio & heats roughly 18" of it, outwards from the building.
Put an insulation break between the inside & outside. Like a bathtub effect.

[grahamdrew]

Thanks again for your clarity and your answers...it's hard to get answers out there

[fatimaebrahim]

Great explanation thanks bro God blessu

[CrazyAIArt]

I had my solid floor milled from a company calked infloheat works wonders. No build up floors warm house warm bills lowered.

[jasonantigua]

This is flipping brilliant! Thanks Richard

[keithianlocke]

If your laying one of the low build options over existing floor, maybe think about giving the floor a couple of coats of thermal paint before laying.
The paint allows the floor to "breath" but helps reflect the heat back up by not allowing the "air moistire" to transfer heat down into it.

[Clark-Mills]

0:28 Looking at the pipes leaving the manifold... There must be a better way to distribute the fluids to minimise heat transfer between hot and cold? I'd suggest spray-foam but suspect that the concrete overhead would be too thin. Maybe there could be a moulded polystyrene panel that drops in that replaces the board below? Just to reduce the inadvertent heat exchanger that we're looking at, especially after the concrete's poured.

[GavinLawrence]

Def in the market for a WHR manifold !

[rpatel]

I have a large open plan kitchen diner/ extension. the kitchen diner half has two radiators and the extension has underfloor heating so in a hybrid system like mine do i just set the thermostat in the kitchen diner area to say 20 degrees and the dedicated stat fr the underfloor heating half to 20 as well? I've read something about having a setback temperature for UFH so im not sure what the best and most efficient way to control and use my stem would be. any ideas or help would be welcomed.