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Could I simply replace the two rads in the kitchen and hallway with UFH piping, and some appropriate valving and the like? Or does the system have to be redesigned? Obviously I'd follow all proper process (not going to just start hacking), just wondering if it's doable in principle?
Have you considered the increase in height of the floor?
Is your floor insulated? If not you will be heating the earth as well as the rooms.
unpopular opinion but i did this in my bathroom .
Low profile insulated mat with small bore plastic pipe. Its attached to a standard thermostatic radiator valve hidden in the cistern unit.
Its a proper bodge but it works grand for a small floor space and keeps the floor tiles dry
My floor is suspended concrete though so a massive heatsink so unlikely to ever reach critical mass to do any damage.
Not a recomendation - but just shows ways it can be done.
Speak to these guy, don't be put off thinking it's not worth their time, small project etc. They really helped us on our project, tech support was really good. Very reasonable price wise.
https://www.wundagroup.com/underfloor-heating/
why do you want to replace them?
we just went through the process of costing out wet UFH for our new extension. compared to fancy rads, which look nice it was significantly more expensive. possibly will regret it in the future. but currently the house isn't having any trouble keeljg warm and I actually like the look of the rads. shame about the horrible ones in the rest of the house
Three storey house and the floor in the kitchen hallway is always cold. According to my crappy IR thermometer it's 14C at one end and 12C at the other end of the kitchen. It's tiles which is clearly not ideal but carpet isn't a realistic option.
I don't know about insulation under the concrete. There is definitely a void, but there's no access to it. If I could gain access I could insulate it which might be a better solution anyway.
Maybe fitting a manhole cover for access?
Unless the house has been built recently, it’s unlikely the floor slab is insulated, so heating the floor will result in just heating the soil underneath. You might be able to use an injectable pu foam insulation under the floor or a quick Google reveals that you can fit an insulated slab over existing an existing concrete floor, but you loose 150mm of ceiling height.
There's a void underneath, possibly an entire basement, because many of the houses we saw being built have one.
I need that endoscope!
We've got a wunda system. Works directly off the combi. Works well with boiler temp turned down.
We've got a 20mm stone floor laid on top, so the whole floor heats up and acts as a radiator/thermal store. Takes about an hour to warm up, and a couple of hours to lose all its heat once off. Thinner flooring would require spreader plates, to even out the heat, increasing costs.
Alternatively, lino foot on 10mm of ply is surprisingly warm to walk on with no active heating....
There was system 10 years ago that hung on the joists, basically corrugated metal with a PU layer and 10mm PB pipe. Looked good then, sounds like it would do your bathroom as long as the spacing is right.