In an underfloor heating and cooling system, it is essential to control the water’s temperature, to have a good comfort level, and for safety reasons (floor surface protection).
Considering that many heat pumps and condensing boilers cannot maintain an exact water temperature, it is important to use a UFH mixing unit where a mixing valve is installed, together with a circulator and an air vent. Besides, it is possible to include the heating manifold or install it separately in a mixing unit.
It is typical to have a radiator in the bathroom where the required water temperature is higher. To solve this problem, we suggest installing a Floor Mixing Controller, a kit that is connected to 2 or 3 radiators, and a heated underfloor area with low temperature.
It is possible to set a fixed low temperature on the boiler, but typically boilers are not designed to keep and limit this temperature. For example, during the start-up or hot water production, it is possible to have higher temperatures quickly, which can damage the pipes and the floor. Also, the boiler pump usually is not strong enough for a UFH system.
The by-pass after the mixing valve is an important device, which allows higher flow rates and a more stable temperature water flow. We suggest 30-50% of the total flow rate thru the by-pass and the rest thru the mixing valve. It will be possible to check the water flow temperature watching in real time the thermostat installed in all FIV UFH mixing units.