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Discuss Will my UFH require its own zone valve? in the Water Underfloor Heating Installations area at PlumbersForums.net

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Messages
27,137
Just watch your max span with cement board last time I looked it was around 450-500mm max also this wouldn’t give good heat transference even with tile addy onto the ufh
 

IND_Nick

Gas Engineer
Messages
224
As above I would always recommend using branded/reputable products as they are generally more reliable and when it comes to spares they are a lot easier to source. Try Uheat the forum sponsor, we have used them for years and never had a problem.
Best practice would always be to have the UFH on a separate zone controlled by the thermostat in the room it heats. You can use the pre-groved insulation, as a preference I prefer insulation below and a metal spreader plate as I think it gives a more uniform heat delivery. I would also normally ply over and then use a thin tile board before tiled floor.
You will find the whole process quite costly for just one bathroom though.
Have you consider an electric UFH mat, especially as it is just a secondary heat source.
If you have a towel rail and really just want a warm floor when the heating is on, you could fit without a separate zone and just pipe stat etc. You would still have to incorporate the pump into the existing heating control setup though. It would work but wouldn't be ideal.
 
Messages
10
Thank you both for the replies. (Trying to get multi quote to work but I'm being abit of a forum Noob I think.

Shaun - Thank you for your further advise. I have had a measure of joist spacings whilst at the property today and spacings are 400mm centres so not an issue in that regard however I do take on board your point regarding heat transfer however I did read (albeit on a manufacturers page) that cement board is good for wet UFH (Link below), that said I am going to look into IND_Nicks suggestion rather than my initial idea.


As above I would always recommend using branded/reputable products as they are generally more reliable and when it comes to spares they are a lot easier to source. Try Uheat the forum sponsor, we have used them for years and never had a problem.
Best practice would always be to have the UFH on a separate zone controlled by the thermostat in the room it heats. You can use the pre-groved insulation, as a preference I prefer insulation below and a metal spreader plate as I think it gives a more uniform heat delivery. I would also normally ply over and then use a thin tile board before tiled floor.
You will find the whole process quite costly for just one bathroom though.
Have you consider an electric UFH mat, especially as it is just a secondary heat source.
If you have a towel rail and really just want a warm floor when the heating is on, you could fit without a separate zone and just pipe stat etc. You would still have to incorporate the pump into the existing heating control setup though. It would work but wouldn't be ideal.

Thanks for your post Nick. I have just been having a look on Uheat and seen the following kit:

The kit linked above on the face of it seems to be perfectly suited to my needs however I am confused by the lack of pump and blender valve. It would appear the kit goes on the rad circuit and uses the radiator valve for temperature control? I'm presuming a more conventional setup with an independent pump, blender valve and zone valve would be more effective than the kit linked above?

I'm presuming when you state you would ply over you would use 18/22mm ply as a structural floor with say a 6mm tile backer board?

Thanks again for your help.

Russ
 

Uheat – Jake

Official Sponsor
Messages
49
Thank you both for the replies. (Trying to get multi quote to work but I'm being abit of a forum Noob I think.

Shaun - Thank you for your further advise. I have had a measure of joist spacings whilst at the property today and spacings are 400mm centres so not an issue in that regard however I do take on board your point regarding heat transfer however I did read (albeit on a manufacturers page) that cement board is good for wet UFH (Link below), that said I am going to look into IND_Nicks suggestion rather than my initial idea.




Thanks for your post Nick. I have just been having a look on Uheat and seen the following kit:

The kit linked above on the face of it seems to be perfectly suited to my needs however I am confused by the lack of pump and blender valve. It would appear the kit goes on the rad circuit and uses the radiator valve for temperature control? I'm presuming a more conventional setup with an independent pump, blender valve and zone valve would be more effective than the kit linked above?

I'm presuming when you state you would ply over you would use 18/22mm ply as a structural floor with say a 6mm tile backer board?

Thanks again for your help.

Russ
Hi Russ,

Feel free to give us a call and we can provide a price for your requirement with a mixing valve and pump.

Regards,
Jake
 
Messages
10
Hi Russ,

Feel free to give us a call and we can provide a price for your requirement with a mixing valve and pump.

Regards,
Jake

Thanks Jake. I am working in quite a remote location for the foreseable with limited phone reception during office hours however I have completed a quote request on your website this morning with some additional information which will hopefully provide adequate information to price.
 

IND_Nick

Gas Engineer
Messages
224
Thank you both for the replies. (Trying to get multi quote to work but I'm being abit of a forum Noob I think.

Shaun - Thank you for your further advise. I have had a measure of joist spacings whilst at the property today and spacings are 400mm centres so not an issue in that regard however I do take on board your point regarding heat transfer however I did read (albeit on a manufacturers page) that cement board is good for wet UFH (Link below), that said I am going to look into IND_Nicks suggestion rather than my initial idea.




Thanks for your post Nick. I have just been having a look on Uheat and seen the following kit:

The kit linked above on the face of it seems to be perfectly suited to my needs however I am confused by the lack of pump and blender valve. It would appear the kit goes on the rad circuit and uses the radiator valve for temperature control? I'm presuming a more conventional setup with an independent pump, blender valve and zone valve would be more effective than the kit linked above?

I'm presuming when you state you would ply over you would use 18/22mm ply as a structural floor with say a 6mm tile backer board?

Thanks again for your help.

Russ
Morning,
Yeah we use 18mm ply as a structural base, then layer of whatever else before flooring. We do a lot of LVT so normally a cross layer of 12mm ply screwed and glued. Or tile backer boards if required.
 
Messages
10
Hello all,

Just a quick follow up to the thread. As suggested by IND_Nick, I contacted Uheat to spec a system and provide quote which I am please to say has now been paid for and awaiting delivery. Thank you to all of you for your input and taking the time to reply.

Russ
 

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