How does underfloor heating work? How it works is that warm water travels through pipework embedded in your floor, transferring its heat into a thermal mass (screed/concrete).
Thermal mass Underfloor heating is most effective when there is sufficient thermal mass in the floor to absorb, store and release heat. Most often this mass is provided by the screed in which the pipes are laid.
When underfloor heating is installed within a concrete floor, the concrete acts as a thermal mass, absorbing and storing heat before slowly releasing it back into the room.

Thermal mass in homes also allows you to run underfloor heating systems only at off-peak hours if you live in an area with flexible rates. It can take many hours before you would even notice a drop in temperature, so you can put the system on a timer to only go on at night or low peak hours.
Underfloor heating is a type of heating that although is extremely efficient is also very slow reacting, as the floor its self is used as a thrermal store. This makes it a perfect accompaniment for high thermal mass buildings.

Furthermore, visual representations like the one above help us fully grasp the concept of Thermal Mass Underfloor Heating.
Ondol heating system_Koreas traditional underfloor heating2_ondol. (1) Long-lasting warmth powered by thermal mass. Why does the room stay warm long after the fire calms down? Because stone, clay, and mortar store heat and release it slowly.
Professional underfloor heating installation in Sheffield. Electric and water-based systems for homes and businesses.Thermal Mass: Underfloor heating systems have a high thermal mass, meaning they take longer to heat up but also retain heat for longer.
Increased Thermal Mass: Underfloor heating systems use the mass of the floor to store and distribute heat, which means that they can keep a room warm for longer after the heating has been turned off. This is particularly useful in areas such as bathrooms...