In the impression of many users, the installation of underfloor heating, the ground at home is certainly hot, so there will be a lot of users just open the underfloor heating will take off their shoes to feel the temperature of the ground with their feet, if the ground is warm, then the ground is warm to feel the effect of warmth; on the contrary, it will feel that the ground is not a problem with the floor heating.

A friend once asked, "My underfloor heating is clearly on and the inside of my home is warm, why is the floor still cold?"

To answer this question it is important to talk about how we perceive an object as hot or cold.

When we touch an object that is lower than our body surface temperature, the heat from our body will be transferred to the cooler object, resulting in a lower temperature in the contact area of the body, at which point we will feel that the object is cold.

It's the same principle that makes people's hands feel warm when they hold a cup of hot water and cold when they hold ice.

For the foot, what kind of temperature will make it feel cold?

Indoor temperature of 20 ℃, for example, the surface temperature of the human foot is about 28 ℃, if the ground temperature is lower than 28 ℃, we will feel the ground a little "cold".

Going back to underfloor heating, underfloor heating generally only controls the room temperature, regardless of the floor temperature.

Most underfloor heating uses a room temperature type thermostat, which only detects the air temperature at 1.4 metres above the ground, and when the air temperature in the room reaches the set temperature, the thermostat gives a command that the hot water no longer enters the underfloor heating cycle, at which point the ground temperature first starts to decrease.

Underfloor heating thermostat mostly detects air temperature

When the ground temperature decreases, the air temperature will also decrease. If the house insulation performance is very good, the room heat loss is very small, then the air temperature will be reduced very slowly, there may be no change in the indoor temperature, but the ground has been lower than 28 ℃, this time to touch the ground with your feet, naturally feel a little "cold".

The manifold controls the flow of hot water in the underfloor heating cycle.

So even with underfloor heating on, the floor may be "cold".

However, this situation is generally less, and mostly in the beginning of winter, when the outside temperature is still relatively high, the room heat loss is relatively small, the room temperature is also relatively easy to maintain. When the temperature is further reduced, in order to protect the temperature of the room, the floor heating will also increase the operating hours, the ground "cold" situation rarely occurs.

Underfloor heating floor temperature shown by infrared imager

If you want the ground is always hot, then there are two ways to solve: one is to use the floor temperature type thermostat, always control the ground temperature at the set temperature;

The other is to set the floor heating set temperature is very high, such as 30 ℃, generally because of the house heat dissipation and other aspects of the reasons, the indoor temperature is difficult to reach 30 ℃, at this time, there will always be hot water into the ground will always be hot, of course, the energy consumption will be higher, if you can accept it, you can consider adopting.