Cost of running electric underfloor heating

Electric underfloor heating is a cost effective & environmentally friendly heating system which lies just below the floor. It creates pleasant ambient heat which is evenly distributed across the room, and frees up wall space from radiators. 

The installation costs for electric underfloor heating are usually much cheaper than water systems, especially when using the Cableflor self-assembly kit. Our system requires no concrete screed or levelling compound, our floor tiles sits over the heating cable to protect it and give you a smooth, stable surface for your floor covering. This means no outside contractors or specialist tools or knowledge – even the cable can be supplied pre-wired so you can just fix the thermostat to the wall and plug it in.

We use recycled plastic from the UK to mould the floor tiles locally in East Sussex, with no cement based products required and the low energy required for heating, this is a really eco-friendly option. Our underfloor heating kit is less expensive than a cheap sticky heating mat to purchase and install, as we have eliminated installation costs and we include Cableflor which replaces concrete to give a smooth surface for your floor covering. This means for a room which is 10 square metres big, you will save about £300.* But how much does it cost to run?

Working out the actual running costs for electric underfloor heating is really difficult to calculate, which is why manufacturers are deliberately vague about it – there are too many variables such as insulation, usage, outdoor temperature and the cost of electricity. 

Recording Temperatures and Costs

At Cableflor we have decided to use two live case studies in different locations to show the running costs of our underfloor heating kit. Any type of heating is only as good as the insulation, whether it’s a log fire or UFH – both of our case studies have insulated ceiling, walls and floor. For an instant price on our system, click here to shop our underfloor heating kit now.

In order to record the running costs for each situation, we used a plug-in power monitor made by Maxcio as shown below. The UFH kit can plug directly into this and allows you to enter the price of your electricity (pence per Kilowatt Hour or kWh) in order to see the running cost in real terms.

Cost of running underfloor heating measured by logtag

We used temperature recorders made by a company called Log Tag which records the temperature every hour. The recorders were positioned inside and outside the rooms in order to reflect the type of weather going on at the time. This data is downloaded each week to give a real example of use and temperature gain.

In both situations, we have kept the kit on constantly, but set to a temperature of around 17 degrees. Neither room is used 24/7, but it is more cost-efficient to maintain a minimum temperature then boost it when you need it – it is also a lot quicker to heat the room.

Case Study 1 – Garden Room

The first location we decided to measure running costs is a garden room. It’s occasionally used as a quiet workspace when WFH during the day, but also used by teenagers as a gaming room on weekends away from adults. The room has insulated walls, floor and ceiling, along with double glazed-windows and doors. The total space is 15 square metres and the ceiling height is 2.2m.

Cost of running underfloor heating

The cost of electricity in the Garden room is 16.16p per kWh, although this is set to rise on November 12th to 21.55p, so it’ll be interesting to see what the running costs rise to, taking into account the colder weather.

We started recording on the 12th of October ’21 – for the first 8 days it cost an average of 39p per day, the following 7 days cost an average of 59.4p per day. This was due to a bit more usage because of half-term, plus it was a bit colder.

It took a couple of hours to boost the temperature to about 21 degrees – you can see the actual LogTag read outs by clicking below and we will continue to update the blog, week by week:

Week 1: Inside, Outside

Week 2: Inside, Outside

Week 3: Inside, Outside

Case Study 2 – Small Office

The second location is a small office that was built inside a completely uninsulated barn, located at the top of a hill in the countryside exposed to all the elements. This also has insulated floor, walls and ceiling and the total space is 13.5 square metres, with a ceiling height of 2.3m.

Cost of running underfloor heating

We started recording this data on Wednesday 27th October ’21, so we don’t have our first week of data yet. The electricity for this rental property is 24.96p per kWh, so we’re expecting a much higher daily average – especially since it is running for longer and the weather has turned cold.

Week 1: Inside, Outside

Shop our underfloor heating kit here, now with completely DIY installation.

*Estimate from WarmUp, based on a 9sqm room. Cableflor has no installation costs, and requires no concrete or screed, simply place floor covering on top of the system. UFH sticky mats on the other hand require tradesmen to fit the thermostat and in many cases to install the mats, pour concrete and fit the floor covering.

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