10 tips for using underfloor heating in a bathroom

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natural bathrrom with white vanity unity

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Installing underfloor heating in a bathroom can work wonders when it comes to taking the chill off cool floor tiles, transforming the space into a warm, spa-like haven. As well as creating an enviable level of comfort by establishing an even spread of warmth underfoot, a well-designed underfloor heating (UFH) system is energy-efficient and low-maintenance.

‘Nowadays people want to get the most out of their bathrooms with spectacular designs, bigger tiles and as little clutter as possible,’ says Lydia Luxford, technical and customer services manager at Easy Bathrooms. ‘UFH provides a great addition to this, reducing the requirement for radiators and freeing up space.’

10 Tops for installing underfloor heating in a bathroom

Here, we lay out what you need to consider when it comes to creating the perfect underfloor heating in a bathroom or shower room.

1. Pick the best underfloor heating system

natural bathrrom with white vanity unity

Image credit: Future plc/Tom Meadows

The correct setup depends largely on your circumstances – electric underfloor heating systems are typically easier to install but come with higher running costs. Electric solutions are often the go-to choice for installation in one-off rooms, including bathrooms, as they can be laid directly over any solid subfloor and result in little height build-up.

‘Electric also allows that single area to be controlled via its own thermostat,’ says Lydia Luxford. ‘Plus, in small spaces electric systems are relatively low cost and spending a little more money to purchase a programmable thermostat is well worth the initial outlay.’

Water-based underfloor heating in a bathroom usually requires a little more work to fit – especially in retrofit scenarios – however, the monthly running costs will be lower.

2. Get the positioning right

To provide the correct heat output and an even spread of warmth across the floor, it’s important that the cables/warm water pipes beneath your flooring are laid at neat, regular intervals. The higher the heat output that is required, the more closely the cables/pipes will be laid.

Loose wire systems tend to work well in bathrooms as they can be arranged to fit around the irregularities of fixtures and fittings. ‘The Warmup Loose Wire system is designed specifically for irregularly shaped rooms and those with multiple fixtures,’ says Sarah Wazir, a marketing executive at Warmup. ‘The spacing between the wires can be altered to match your needs and the required heat output.’

For an additional flourish of luxury, some loose wire arrangements can even be installed behind your bathroom’s wall tiles.

3. Choose the right flooring for underfloor heating

shower room with natural tiles

Image credit: Future plc/David Giles

‘Underfloor heating works well with wood, tiles or stone flooring,’ says Adam Chard, content manager at Victoria Plum. However, smooth, hard surfaces like porcelain and ceramic tend to have the edge over other solutions when it comes to heat conductivity.

‘Tiles are always a strong favourite and can withstand the heat in most applications. When installed correctly they can last substantially longer than most other flooring options,’ says Lydia Luxford from Easy Bathrooms. Tiles are easy to clean in case of splashes from the sink and shower, too. Be sure to choose a product with an anti-slip surface.

Some laminate and vinyl products are not suitable for use alongside electric underfloor heating. So be sure to check with your supplier that the UFH kit and floor surface are compatible.

4. Set the temperature correctly on your underfloor heating in a bathroom

Managing your underfloor heating by setting the thermostat properly will save you energy and money in the long term. One common misconception is thinking that adjusting your thermostat to a higher temperature will heat up the space quicker.

This isn’t the case and may even result in overheating and wasting energy. Setting a temperature of around 21°C is adequate in most bathrooms, depending on the unique heat requirements for the space. Most UFH products come with detailed instructions on how to set the correct temperature for a cosy space that’s heated efficiently.

5. Leave your underfloor heating on

During the chilly winter months, it’s worth keeping your system running continuously. ‘When you’re living in cooler conditions, your UFH will take some time to warm up,’ says Adam Chard. Constantly turning the heating on and off may result in wasting energy.

A temperature between 16°C and 25°C is advised when leaving the heating running for long periods of time. This will ensure the setup runs efficiently and provides a consistent level of warmth.

6. Ensure your system is serviced

bathroom with wall hung vanity unit

Image credit: Future plc/David Giles

One of the main benefits of UFH is how little upkeep is required. In particular, an electric setup won’t require regular servicing – provided it has been installed correctly. ‘If you have a water-based system, it’s best to have it serviced every year, just like you would your boiler,’ says Barrie Cutchie, design director at BC Designs.

‘They can just check it is working efficiently and identify any potential issues before they happen. It isn’t a requirement but it is good practice.’

7. Get the heat output right

‘In rooms with exceptionally high ceilings, UFH can be less effective,’ says Adam Chard from Victoria Plum. That’s why it’s so important for your heating engineer or plumber to carry out a full heat loss survey on the bathroom before the system is specified.

The calculations look at an array of factors, including the dimensions of the room, level of insulation, windows and the existing forms of heating. The numbers are then crunched so that a setup with the correct heat output for the space can be specified.

8. Check the subfloor

When it comes to underfloor heating installation, make sure the subfloor is stable, rigid and flat. If there’s no insulation, it’s fairly straightforward to fit rigid insulation boards. This will ensure the warmth your system generates isn’t lost downwards.

‘Looking at the quality of your subfloor is such an important step,’ says Barrie Cutchie from BC Designs. ‘There is an ideal when it comes to this area, and that’s a fully-cured, fully-level concrete floor between 60 and 75mm – but this isn’t always possible. The main thing is to make sure the floor is completely level before UFH is laid.’

9. Create a smart underfloor heating setup

black tiled bathroom with wooden floor

Image credit: Future PLC/Lizzie Orme

Investing in a smart thermostat takes the amount of control you have over your underfloor heating to the next level. For example, Warmup’s 4iE Smart WiFi thermostat allows you to manage your system remotely. Even helping you set up an automatic heating schedule for your bathroom.

This means that your bathroom will always be the right heat when you need it to be. An especially handy feature if you’re coming back from holiday and want a quick shower when you get home. What’s more, a smart system that learns your routine will help you cut down on wasting energy to heat the bathroom when you’re not using it, ultimately saving you money on bills.

10. Create a hybrid setup

While getting rid of radiators will free up wall space and give you more freedom to position fixtures and fittings in your family bathroom, there are some advantages to having a hybrid setup.

A slim towel rail, for instance, provides a handy spot to warm towels or clothes so they’re toasty when you get out of the tub or shower. Numerous compact designs are available to suit even the smallest of bathrooms.

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