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Why has my underfloor heating got hot and cold patches?

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Where Underfloor Heating is installed with a gas or oil boiler, hot and cold patches on the floor are quite common. It can get very uncomfortable when the floor overheats. Hot patches on floors can lead to extra cracks been created by imbalanced temperatures. When it comes to timber flooring the temperature setting are increased by at least 10° to allow for poor heat transfer, this can lead to boards cracking or buckling if the temperature gets too high. Hot and cold spots on the floor is caused by high temperature water entering the underfloor heating loops. This leads to air locks and slow flow rates resulting in patchy heating.

Overheating of floors

It takes a lot of energy to raise concrete to high temperatures, especially if the floor is only heating in patches. This is the reason why rooms can take days to reach the desired temperature setting before it switches off the underfloor heating zone. It can take 24 hours or more for the room to cool down, as the floor is so hot it raises the room temperature away above its stat setting. This is the reason why you feel the change in temperature from one day to the next, and it is difficult to maintain the desired temperature. The fuel cost is enormous as the system is on constant over drive, with no proper control over floor and room temperatures.  

Take back control of your Underfloor Heating

Most underfloor heating systems use a fix temperature controller to regulate the water temperature entering the floor. This can be set at any temperature the installer desires. I have seen UFH systems set at temperatures from 45°C to 70°C.

The flaw I found with this was at start up the water temperature entering the floor was too hot and as the floor temperature started to increase it did not heat uniformly. Hot and cold patches started to appear at an early stage, the concrete was rejecting the high temperatures.    

Oxyvent gives you back control over your underfloor heating. We use a low temperature self-regulating technique to heat the floor, which not only help maintain an even temperature over the whole floor surface, but also prevents floors from overheating.


We discovered the natural way to heat concrete is with low water temperatures. By striking the concrete with low temperatures it transfers the heat at a much higher rate. When concrete absorbs heat at a lower temperature the floor heats up 50% faster, compared to a system heated with high temperature water. This provides a warmer and more comfortable heat which radiates throughout the house. You need to be able to comfortable walk on the floor, so it doesn’t have to be heated to more than 30°C, which make it more energy efficient.

Contact Oxyvent to get even temperatures on your floor.