Hi Bill

The system that I have seen, consisted of a "trench" in the concrete floor of the offices, running around just below the windows adjacent to the exterior walls. In the "trench" were two copper pipes, 15mm dia.(?) with square copper fins attached, possibly 1. 1/2" or 2" square(?) maybe 1. 1/2" ? apart. Top of "trench" covered with fancy patterned Ali grating until the pikeys broke in and knicked it after the building was left vacant for a few months. Whether that design is common or not, I've no idea.

John

A little context would help
I assum you are talking heatpumps. Generally, yes underfloor heating heats the floor to warm underfoot and that heats the ret of the room.
We have electric underfloor heating in two areas of the house and it works well. Main heating is air-air heat pump (2 outdoor units 5 indoor) that alos pprovides air conditionng in summer.
The house was built witth "ceiling heating". This comprised foil heating elements behind the plasterboard forming the ceilings. No it does not work heat rises and white ceilings don't radiate well. The previous occupants had resorted to portable heaters….
Air-Air heat pumps are great but you don't get a grant for them because of the airconditioning capability.

I'm not sure about air-water ones when keeping existing radiators. The radiators were designed to work with hotter water than the heat pumps can create efficiently. Using underfloor heating with them seems much more reasonable. Lower temperature but larger surface area for same energy.
One disabvantage is you could loose a bit of headroom due to the thickness of pipes and insulation required.

Robert G8RPI.

When my old Dad designed and built his bungalow in the early '60's, central heating wasn't common. He routed all the pipework underfloor to the rads, which was neat and quite nice to have areas of warm floor. Inevitably, settlement lead to a couple of leaks which damaged an area of parquet before being obvious.

pgk

Keeping the room warm requires a certain amount of energy in the form of heat. Various ways of providing the same amount of heat:

• A small very hot surface such as the bar on an electric fire, or
• A larger surface at moderate temperature like a central heating radiator full of hot water, say 80°C

So a huge surface, like an underfloor heater, can be operated at a lower temperature and work as well as other systems.   Surface area and temperature are inter-related.

All of them rely on insulation to make sure energy isn't wasted.

Dave

Edited By SillyOldDuffer on 06/02/2022 21:56:52

Edited By Ian P on 06/02/2022 22:17:51

Apologies for not creating a sensibly usable link

Edited By Ian P on 06/02/2022 22:19:05