How to install underfloor heating. Full A to Z on the pros and cons of wet underfloor heating. 

Thanks as always for your time Tomkat. The research, recording, editing, thumbnails and publishing.

2 days looking at youtube UFH. learned the most from this video great presentation i was engaged all through.Everything was clear and understandable ,thank you 👍

What a great video. Packed full of seriously useful information. Thanks mate!

A very comprehensive and informative video, presented in a relaxed easy to digest format. I have learned a lot from this video, Thank you.

Brilliant! Most useful complete video I've seen so far!

Nice one Derek. You’re a top geezer. The point about the rugs was actually something I’d never considered. 👍

Thanks for being clear yet detailed. Learnt a lot from this, thanks

Absolutely brilliant fantastic video so much info that I would have never of thought of Cheers 👍👍👍

Brilliant, really enjoyed your presentation. Good teaching ability. Will look for your other videos on heating.

This is an absolutely wonderful video. Thank you it’s been so helpful.

Thank you for this very informative video. Loved your no nonsense presentation.

Extremely help this, thank you very much for posting this and sharing knowledge :)

Absolutely brilliant and very informative and educational thank you very much 👍🏿.

Extremely informative video. It was really helpful mate. Thank you.

This was incredibly well explained. Thank you.

Brilliantly explained great video will be doing my house with UFH keep up the videos

Absolutely brilliant video thanks for your efforts ☺️ very much appreciated 👍👌

Thanks so much for the video and info! It explained everything well and clear!

great video!! Really learned a lot about this for my upcoming refurb, Thanks,

Excellent video, have learnt a great deal from this, now far more confident when I make my decision on which contractor to choose.

Great video. Very informative. You're a great teacher. 👍

Great video, set it clearly what we needed to know. Cheers mate

Honestly a great video. Have been searching for a detailed video on this topic for some time. Thank you for that. Also the "dancing like michael jackson" and the edited "maximum" send me flying :D

Great video. You have really helped me out understanding the system.

Thanks, great explanation. Planning to do my underfloor heating as DIY

Much appreciated! Very well articulated 😊 thank you 🙏 Just made a carpenter confident installing ufh! 🎉

it has been really of great educational and informative video. thanks

Absolutely love this video, just trying to get clued up before contacting companies about installing an ASHP and UFH

Brilliant vid Derek!

Very helpful video mate, really appreciated 👍

this is such a great video... thanks!

This was so so helpful, thank you very much 😊

Thanks Derek - very informative.

Thank you Derek. 👍

Thank you for this - very useful.

Brilliant, and very useful for a UFH newbie like me. I'm trying to decide the best method for my garage/workshop (which has yet to be built), just so I don't freeze in there whilst working or machining (stood in one placefor a long while). This is perfect - thank you.

Brilliant video thanks so much

Great video! 👍

Thanks. Very good

Very helpful, thank you.

I hadn't even considered the impact of rugs trapping heat and damaging the flooring - thanks!

Great video 👌🏻

Very informative

Another nice video again derek, can you make a playlist of your 10 minutes video derek.

Excellent

Dear Expert, Thank you for the brilliant explanation. My question is whether we can install new laminate on top of old ceramics while using a wet floor heating system. Could you please guide me on whether this would prevent efficient heating conductivity, increase energy consumption, and how it might affect moisture levels? Additionally, what steps can I take to control these factors? Best regards,

If you like this video say so, or if you don't "leave a constructive comment" :) Very helpful. Bought a house with an air to air heat pump and as I was getting ready to strip all the floors thought about underfloor heating. Sounds very hard to DIY... Read in one of the comment that you can just pressurise with a water hose. I think that's quite helpful, as the actual laying of the pipes sounds easy enough, it's the dicking around with the heat pump that scares me. Regardless this was a really good video. 40% savings in energy on top of heat pump... I'd end up paying next to nothing in energy... I'll keep on reading. I am in Switzerland where labor costs the GDP of a small country, so can't really hire easily to do work here.

thanks so much

Excellent I love UFH😍 rads are rubbish but make us rich! For the past 6 years in the EU 90% of new build is UFH the rest is 8% air con 2% rads. In the UK ZERO UFH. Why do our MPs hate eco UFH? take care, George 😍👍

Great video mate, looking at getting underfloor heating as I probably have Red Ash and all the floors need to be ripped up. Really informative, will it be ok on a 10 year old vaillant combi you reckon? Cheers

Hi, enjoyed the video! Thanks for this! I did have one question. On 38.08 into the video, you mentioned a thin layer of polyethylene DPM above the screed if it's suspended timber flooring. To date, I haven't found any guidance or manufacturing info that suggests a polythene sheet is required. Is this mandatory per building regs, or optional? Also is there any risk of that sheet burning or catching fire from the pipes below?

With the dry floor construction what material is underneath the diffuser plates, and how much height does that add to the floor? Can you add slate tiles directly on top of the diffuser plates or do you need some type of wooden flooring directly on top of the diffuser plates? If I have an uneven, sloping concrete subfloor what is the most effective way to create a level floor when using a dry floor construction?

Great video. What is your feedback on Nu-Heat? Or any other supplier recommended?

Excellent video and very informative, thanks. I wonder which manufacturer of UFH you prefer!

Great video, but I've now just gone off the idea of using underfloor heating in my extension due to its complexity and cost etc. My house is absolutely fine with radiators so my extension will be as well. Plus the log burner that's gonna go in there.

Great video!! Do you think it is possible to install water heating room by room?

Looking at the spreader plates installed on a floating floor: how thick should the chipboard and engineered wood be? In the clip it mentions the flooring shouldn't be more than 15 mm thick. Is this for both the structural chipboard and the finishing wood layer? Thanks

polythene sheet long-term is an air/vapour control layer to reduce the interstitial condensation that occurs in the insulation and plywood in the winter season. Yes, during construction, it gives a temporary protection to the finish above from the curing mortar.

Hi Derek What is your opinion on low profile underfloor systems with 9.9mm pipes? Can the small diameter of the pipe be an issue on the longterm? The one what we were quoted claims only 3.5 cm build up on the existing subfloor. It has 1.5cm screed on top of the castellated panels. Will that thickness be strong enough? Tia Peter

20 Degrees? We dream of 20 Degrees. Max is 18C, except in summer, in our 1805 stonewalled house. Put on another jumper. LOL. We had underfloor heating installed in our previous Victorian house; it was great.

This is great video, lots of important information. I have a question. If I do it in my old house with floor on joists, there are electric cables and water pipes running below the floor. With Ufh installed, how would I get access to them in future if something needs repairing for electricals or mains water?

amazing video, I was wondering if you can provide us information for who are going to move in to a new build with Rods, but want to convert it to UFH , does that work at all ? what are things we need to know . cheers

Brilliant video. If laying in a ground floor self build, with needing to pressurise to 6bar before final screed, can this water be taken from a hose from outside mains or does it require your permanent manifold plumbing and the pump installed?

Very informative but what about shrinkage after the screed has dried out. Do you really need to put air at 6 bar in the piping, thanks

what do you do with the power output and the max heat output? i didnt get that part, what is the capacity needed per square meter?

If installers follow your advice they can't go wrong. Hot water temperatures and cylinder recovery times are the compromise. Even properties insulated to the latest standards will struggle to compete overall with gas. COP figures can be misleading, the difference in fuel costs need to be taken into consideration. How the electricity is sourced is a major factor to be considered if CO2 reductions are going to be meaningful. No easy route to zero carbon.

👍 brilliant video, what manufacturers do you recommend derek ?

Hi Derek, thanks for the video. I don't have UFH at the moment but I'm slowly renovating my house starting with the hall which has a suspended timber floor. I want install a new LVT floor covering so I would like to pre-install the pipework for UHF so I don't have to do it later. I have 22mm floor boards which I will remove and presumably install the following: 75mm insulation board with batons, spreader plates, pipe loop and then new 22mm subfloor plus a thin floor levelling screed with the LVT covering on top. As I only want to buy the pipe and the plates right now my questions are: Which is the best system to buy ie pipe diameter etc and is 22mm ply plus the LVT covering going to be ok for the heat to radiate through? many thanks Adam

Two and half months to dry? is the floor got a limit of how much weight it can take? is a resin quicker drying time?

For a first floor flat with timber joists, no insulation between joists and traditional T&G timber floorboards, which of pipework methods shown is most cost effective?

Hello I am in process of installing water underfloor heating. As part of the project the engineer is also moving the boiler from kichen to garage. My question is when the project completed what kind of certificate and documentation should I get for the underfloor heating installation and for moving the boiler for my future record. Can you please list out what should I get from the company on completion please. Thanks,

Apologies but I am a newbie. Our boiler is in the corner of the kitchen. We are extending out into the garden and looking at UFH. The building will go upto the garage so looking at putting the manifold in there. My lack of knowledge then hits a wall. Can the flow and return from manifold not tee off the boiler? As I was told it would need to come off near the the airing cupboard. Which would be a chore in itself to get pipes from here. Thank you and loving your videos.

I was wondering, how much flow hight do you need to have underground heating on a concrete floor

Do you have any views on retrospective installation of underfloor heating on a concrete subfloor? Is it better to fit a low profile system (say 15mm depth) or in-ground systems (such as JK Floorheating ltd). Obviously fitting pipes directly into concrete will add to heat losses (I assume) but is this significant? Thanks for any guidance. Have also though of adding indexing to your videos so that it's easier to find sections. It would be a good addition and is easy to do.

Great video. What are the best manufacturers for UFH in UK?

Hi really interesting. Just thinking what about house with wooden flooring upstairs if they need rewiring or Spot lights adding for downstairs in future how can you access easily

I have wet UFH fuelled by a gas boiler.. My concerns are, how will an air source heat pump effect it's efficiency. .?

Great video Del. Just a couple of points you may have missed on the unquestionably benefits of UFH; Our body loses 65% of its heat by Radiant Heat, so with UFH producing mainly radiant heat(in N America it’s called Radiant Heating), it counteracts this body heat Loss & feels extremely comfortable in your Home. As a result of all this Radiant Heat, a room heated to 17-18DegreesC feels like 21. The layout of the loops in most rooms is rarely critical, as the Delta T on the UFH loops is very low - 5-7DegreesC. On UFH Design, you generally go by ‘the mean water temperature’ of the loops. Most UFH loops should be no longer than 100Meters in length. This in most cases will limit the circulation pump head & flow rate. Ensuring a standard domestic circulation pump can be used at the Manifold. Another wee point about UFH & mixed temperature systems; Say you have a Zone of Radiators on the First Floor, which is very common & Heating a Cylinder to over 60oC. Hydronic separation may be required, or carefully placed ‘close Coupled’ Tees for the UFH F&R. UFH is also very, very compatible with condensing boilers. There’s a lot of Design considerations with a UFH system, so it’s not for the ‘hard of thinking’. Cheers Del👍👍

I'm seriously considering having UFH installed to my bungalow before we start a full renovation. It was constructed in the 1950's and has a concrete floor so by my understanding from the video I would require a "dry floor construction" my question is because of it being concrete would I need to lay down a damp proof membrane and extra insulation before laying the spreader plate system?

Where are some good sites to buy the system from?

So, what course would you recommend to learn how to fit an UFH system? For floating floor can you lay the system on top of floorboards as well or it must be done only putting battens between joists with insulation as shown?

The question is, can I have both underfloor and radiators to use for an extra boost?

Hi. Can you give us a price how much will cost for a house with 2 3 bedrooms and 70 90 mp³? Just to have an idea how much we are going to spend ... just an example how much can cost :-)

I did not realise there was so many elements to ensure a good installation. This makes me worry that there are going to be lots of poorly installed systems out there as (certain) installers cash in on the rush to carbon zero coupled with the lack of communication and information, to and for the general public.

Is legionella really that much of an issue ? My cylinder stat has been about 48 degrees for as long as I can remember……thinking that legionella only thrives in static water I think I’ll be ok until I’m so old that I can only be arsed to shower once a month 😂

🤘😎🤘

Hi can we use two different pipe sizes with same manifold using an adapter. I'm thinking for using a 16mm pipe for my kitchen which has a larger area and 12mm pipe in hallway with wood floor which i will take out n install 60mm insulation between 100mm joists.

I don't like to stick tiles directly to the floor. Is it ok to put down cement board on the floor and stick the tiles to that. Will that work?

Building regulations? What location/country?

At 1:50 you mention space heating can be run at a low flow temperature, e.g. 30°, but hot water cant -needs to be 60-65 degrees. How can the same system have two different temperatures? Or would you need a different system for hot water as opposed to heating? I tought airpumpa could replace a gas bouler but if they only have a flow temperature of 30 how is this possible.

On floor coverings you mentioned manmade rugs could be damaged by the temperatures , however earlier you said design flow temperatures where 55C or less . How could that lower temperature melt a rug ?

Derek what sort of pressure should you run an underfloor heating at ? As a lot of people show you how to fill up and pressure test but don’t explain what the pressure should be left at 👍

You always install radiators under windows so you dont get the cold drag, with floor heating you always get the cold drag from the windows

I would have thought that using actuators, controlled off room stats is not ideal for in-slab underfloor heating, with its slow response time and thermal lag. Wouldn't it be better to vary the supply water temperature to the manifold, using weather compensation?

Is it possible to use two manifolds ( one for each floor).

On a separate note.. how the hell do you gas rate on a EDMI GS-60B meter?? Struggling right now.

Can you use concentric with spreader plate system ?

UFH doesn't give off radiant heat. Radiant heat is when a heat source heats up another object without heating the air in between - ie. emitting a large amount of IR energy. UFH still works via the principle of convection.

Hello, I am desperately looking for some advice, I would be extremely grateful if anyone was able to help? I have underfloor heating and I have a manifold in the cupboard. When I turn my heating on, all the flow pipes on the manifold go hot (as expected) but the flow pipes for the different rooms are different temperatures, for instance my bathroom return pipe is cold and does not warm up at all, although the flow pipe for the bathroom is hot. Does anyone know why this may be? Many Thanks in advance

Under floor heating is an old technology at this point. The dust and particles canot seatle in the room and will cause lung issues down the line. The healthy option is when the pipes are in the wall.