Is it possible to connect water-based underfloor heating to the pipes from a water-based radiator so that it replaces the radiator?
 
No, it probably won't be suitable since radiators are fed with really hot water, up to around 65 degrees, and underfloor heating usually operates at a maximum of 32 degrees, but you might be able to buy a shunt valve that controls the right temperature for the underfloor heating.

MvH Jawen
 
Ok. Is there any better way to do it than to connect to the radiator hoses? It is an area of about 6m2 and the boiler is slightly below. It's an old house so the radiator is not in new condition. Best regards, Emil
 
Do not know how large your heating needs are, but an option is to buy a new or used towel warmer that is waterborne in the dimensions of 15mm, 18mm, or 22mm, which you can connect with your old radiator pipes.
The floor may not get warm if the boiler does not heat from underneath.

Best regards, Jawen
 
At some control centers for boiler management, you can control the outgoing temperature, and if you have such a system, you can set the maximum temperature for the system to perhaps 35 degrees, and then you can use the pipes from the radiator to the underfloor heating. If you don't have this, in your case, I would install a shunt to handle this and install underfloor heating.
 
Exactly Peter.holm, I also advised that a shunt is needed, as lowering the outgoing temperature wouldn't be good, since the rest of the house likely has radiators based on area, which clearly require higher forward temperatures to heat the rest of the house properly.

It will probably get cold in the rest of the house.

Best regards, Jawen
 
Micro circuit valve seems really interesting! But I wonder why underfloor heating has to be embedded in concrete or self-leveling compound for it to work.
 
It does not have to be embedded, but it is recommended as it distributes the heat better.

For regulation, you can also have a blandningsventil that's what I was thinking :)
 
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