Water Underfloor Heating

What is Water Underfloor Heating?

Wherever there’s new building going on, underfloor heating is proving to be a popular alternative to traditional radiators. Three of the reasons for this popularity that we hear most often are:

  • Cosy, luxurious heating rising up through the floor
  • Lower heating bills
  • Radiant heat which doesn’t attract dust into the atmosphere

Liquid Screed Direct is one of the UK’s leading water underfloor heating installers, and we often get asked what wet underfloor heating is, and how it works. So here’s our quick guide.

What is Wet Underfloor Heating

It’s a system which provides a rapid, even warmth as the result of heat rising from a grid of water pipes laid beneath the floor. Warm air rises, losing approximately 2ºC at a height of 2 metres. It provides an ideal indoor climate, with a floor temperature between 19-29°C, and an air temperature between 20 – 24°C. The heat produced is radiant, meaning that it heats objects, rather than the air.

How Does Wet Underfloor Heating Work?

A grid of water pipes, which are connected to your boiler, circulate warm water to heat the room above. The flooring in which the pipes are embedded needs to be an enhanced thermal conductor to ensure that heat travels rapidly to every corner of the space. We use liquid screed, which was designed for this purpose. It is poured on site by a small team of screed specialists.

What Temperature is Best for Underfloor Heating?

One of the most attractive qualities of underfloor heating is the fact that it runs at lower water temperatures than radiators. Normally 27-31ºC is sufficient, but this depends on the flooring finish. At Liquid Screed Direct, we install a flow screed sub floor. This is optimised for thermal conductivity. Then an appropriate flooring finish, such as tiles or stone, can be laid on top.

Where’s the Best Place to Install Water Underfloor Heating?

One of the most luxurious locations for wet underfloor heating is the bathroom, but it’s by no means the most popular. Households are now recognising the many benefits of this form of heating, and are installing it in hallways, kitchens, and living rooms. The efficiency of the system, and the cost-effectiveness, makes it a great way to heat large open plan spaces.

What is the Installation Process for Wet Underfloor Heating?

The floor first needs to be carefully prepared by professional installers. They will also carry out a series of checks on the boiler to check that it can support the new heating system. The grid of pipes is then laid, and liquid screed is poured over it. Great care is taken to ensure that no air voids are created in the process, as these can cause uneven, or patchy heating cover.

How Long Does Water Underfloor Heating Take to Install?

Thanks to the liquid consistency of the screed, the initial part of the installation is quite quick. 24 hour after the pour, the liquid screed sub floor is able to take light foot traffic. After 7 days the flooring can be force dried using the underfloor heating system. This takes a further 7 days and needs to be carried out by a professional, as the humidity needs to be kept to a minimum throughout the process.

You Can Trust Liquid Screed Direct for Underfloor Heating Solutions

We ensure that our clients receive the very best underfloor heating installations. We use only top quality liquid screed sourced in the UK, and our screed specialist are recruited locally. This means that we can provide a rapid response when and where you need us.


If you’re thinking of installing wet underfloor heating, called Liquid Screed Direct to talk to specialist installers.


Need a FREE quick quote or to get in touch?