Key takeaways
- Underfloor heating (UFH), in comparison to radiators, is more comfortable, energy-efficient, and aesthetically pleasing.
- It offers soft, ambient warmth and opens up wall space for furniture or decor.
- Underfloor heating will fully replace radiators so long as you have proper insulation and system design.
- You often can’t use your old radiator pipes — you’ll need new pipework or mats instead.
- The installation is generally disruptive, especially for the wet system where screed is required.
- Ideal for renovations or new builds where floorboards are already being replaced
- It adds long-term property value and low running costs when correctly installed.
- Note that you should always begin with a professional evaluation to confirm that it is the right fit.
- Can Underfloor Heating Replace Radiators?
- Converting a Radiator System to Underfloor Heating
- Can You Use Radiator Pipes for Underfloor Heating?
- Step-by-Step: What’s Involved in Replacing Radiators with underfloor heating
- Is It Worth It? Pros and Cons
- Conclusion: Should You Replace Your Radiators with Underfloor Heating?
Home renovations are on the rise, and if you’re looking to modernise your heating system, you may be asking: Should I convert to underfloor heating instead of using radiators? The theory is appealing — underfloor heating provides greater ease, better energy efficiency, and a cleaner aesthetic without wall-mounted radiators. It also clears valuable wall space, especially in smaller rooms.
But does underfloor heating eliminate the need for radiators? And perhaps most importantly, is it worth paying for? In this guide, we’ll take a closer look at how underfloor heating stacks up against conventional radiators, what the switch entails, and if it’s right for your property.
Tired of Bulky Radiators? Upgrade to Sleek, Efficient Underfloor Heating
Next Level Underfloor Heating and Screed Solutions
Book your free expert survey to see if it’s the right fit for your home.
👉 Get My Free Heating Assessment
🏆 Trusted by 100+ Scottish property owners | 5.0★ on Google
* 50-year underfloor heating pipes guarantee included on all UFH projects *
Wendy Howe, ⭐️⭐️⭐️⭐️⭐️ Google Review
“We had underfloor heating installed this week, and I can’t speak highly enough of Alan’s work. From start to finish, he was professional, punctual, and incredibly knowledgeable. The quality of the installation is excellent — neat, efficient, and clearly done with care and expertise.”
Can Underfloor Heating Replace Radiators?
Yes, in most Scottish homes and businesses, underfloor heating can fully replace radiators. Whether you’re building, renovating, or upgrading your heating system, underfloor heating offers low-profile, whole-home comfort when installed with proper insulation and zoning. Compared to traditional radiators, it delivers gentler, even warmth and can work with modern boilers or heat pumps.
Radiators heat up to 65–75°C, whereas the highest temperature an underfloor heating system would emit is around 27–29°C on the floor surface, which means they must cover a larger area and run for longer to offer the same level of warmth. That’s why excellent system design and insulation are important.
Suitability can differ by space. Underfloor heating, for instance, is excellent in bathrooms, kitchens, and open-plan living areas. Smaller or hard-to-insulate rooms may require supplementary heating.
The construction of your home is a giant factor as well. Underfloor heating is simpler to install and more efficient in new, well-insulated properties. In older buildings, it may still function, but additional insulation is likely needed to ensure efficiency.
So, does underfloor work instead of radiators? Yes — used in conjunction with a properly designed and installed system, underfloor heating is more than sufficient to heat an entire house independently.
Converting a Radiator System to Underfloor Heating
If you’re planning to replace radiators with underfloor heating in your Scottish home, it’s fully achievable, especially during renovations.
The first choice is whether you’re doing a new build, a major renovation, or a retrofit. If you’re doing new builds or major refurbishments, you’ll have much more scope to lay a full wet underfloor heating system that’s connected to your boiler or heat pump. The process involves laying pipes in the subfloor, insulating, and pouring a screed or fitting pre-formed boards.
In retrofit situations, moving from radiators to underfloor heating can prove difficult. It might involve raising floors, moving door thresholds or installing more layers of insulation. Fortunately, modern retrofit systems are significantly flatter than older systems, often being as little as 15mm deep and installed with minimal disruption.
When replacing radiators with underfloor heating throughout an entire home isn’t feasible, a hybrid system is possible. You may install underfloor heating in open-plan spaces or outside bathrooms and maintain radiators in less easily accessible places, such as bedrooms or upstairs spaces. Both systems can work side by side when you have the right zoning and controls in place.
You also need to think about the heat source. Conventional-type boilers can also be used at the same time as underfloor heating, but they will need to work at lower flow temperatures, being correctly installed to run underfloor heating at its lower temperatures. Heat pumps are an ideal match because they inherently work best at lower temperatures.
From a plumbing perspective, the majority of radiating systems are pressurised and closed-loop, both of which meet underfloor heating needs. However, pipe diameters and layouts will differ (more on that below), so it’s unlikely you’ll just be able to plug underfloor heating straight into your radiator network without modifications.
It’s best to convert a radiator system to underfloor heating at the renovation level or when you change the flooring. Then, you can install floor prep, insulation, and pipework more easily and affordably.
If you’re planning this upgrade during a renovation, we provide full underfloor heating installation in Edinburgh along with support across surrounding Scottish areas to ensure everything is designed and fitted correctly.
Lewis Ross, ⭐️⭐️⭐️⭐️⭐️ Google Review
“Screed and underfloor heating can be daunting, but Alan & Gordon are top class. They explained everything clearly and knew the answer to every question. The original floor was in terrible shape, but they left the house perfectly level.”
Can You Connect Underfloor Heating to Radiator Pipes?
It is technically impossible to just plug underfloor heating into the same pipes you used for radiators. Both systems can utilise the same heat source (e.g., boiler); however, the pipework itself is generally incompatible with underfloor heating.
Radiator systems are usually piped in a looped/branched format using 15mm or 22mm pipes. In contrast, underfloor heating employs runs of smaller-diameter pipe (typically 12–16mm) in a serpentine arrangement. This technique provides even heat across the entire floor surface.
There is also a giant gap in operating temperature and flow rate. Underfloor heating operates at lower temperatures (approximately 35–55 °C) that demand accurate flow control and appropriate zoning. Attempting to source radiator pipes — specifically designed to work at higher temperatures and with different flow dynamics — will lead to uneven heating/cooling, poor performance, and high levels of stress on the overall system.
Existing supply pipes will feed to a new underfloor heating manifold in some limited circumstances, but new loops will still have to be laid for the floor zones. That’s why underfloor heating professionals recommend fitting dedicated pipework.
If you’re hoping to convert, the pipework will need to be replaced entirely, and this will usually work out cheaper than adapting something unfit for purpose. The result? A more efficient, safer system that works as advertised.
Katie Izat, ⭐️⭐️⭐️⭐️⭐️ Google Review
“Absolutely first-class installation from Gordon and the team. Queries were answered immediately and nothing was too much trouble. On-site, the guys were super-efficient and even finished ahead of schedule. Our other builders have all commented on the level of work — respect indeed!”
Step-by-Step: How To Replace Radiators With Underfloor Heating
Replacing radiators with underfloor heating is an investment — one that yields improved comfort, energy efficiency, and design flexibility. But how does the process work, exactly? Here’s a detailed step-by-step breakdown of what’s at stake, from preparation to finalisation:
1. Initial Assessment and Planning
The initial and essential step is a thorough professional survey of your property. This stage includes analysing floor construction, insulation levels, ceiling heights, room sizes, and your existing heating system. What we aim to do here is work out whether a wet (water-based) or electric underfloor heating system is right for you.
The system will determine heat loss calculations, zoning layout, pipe spacing, and any necessary modifications to existing boilers or the installation of a heat pump. The following stage creates the foundation of a completely custom underfloor heating plan made for the home.
2. Removing Radiators and Prepping the Floor
Your existing radiators and associated pipework are disconnected and removed. This action instantly clears wall space and makes room for the new system.
The flooring is removed to show the subfloor. At this stage, installers look for moisture problems, existing damage, and whether more insulation is required. In retrofit projects where maximum floor height is imperative, low-profile overlay systems can be used to minimise disruption and avoid extensive excavation or screeding.
3. Insulation Installation
It is critical that the underfloor heating is properly insulated. If not, the subfloor beneath the tiles may literally lose heat, reducing its efficiency and comfort.
Insulation boards — usually made from polystyrene, polyurethane, or specialist reflective materials — are laid directly on top of the subfloor. The type and thickness will depend on your property and system choice, but getting this step right will ensure you a quicker heat-up time and lower running costs.
4. Installing the underfloor heating System
Once insulation is in place, the underfloor heating system is installed.
- Wet systems use continuous loops of flexible plastic pipe arranged in a serpentine or spiral layout to ensure even coverage. These pipes are clipped onto insulation boards or laid within pre-grooved panels.
- Electric systems involve heating cables or mats rolled out across the floor. These are quicker to install and ideal for small rooms like bathrooms.
In both cases, the system is split into zones, each with its thermostat, giving you better control over room-by-room temperatures.
5. Screeding or Overlay
In wet underfloor heating systems, a layer of screed (typically 50–65mm thick) is poured over the pipes. It protects the system and works as a heat conductor that distributes warmth evenly across the floor surface.
In retrofit situations where screeding is impractical, dry systems can be used featuring pre-formed overlay boards that eliminate drying time and add little in the way of height increase, which makes them perfect for upper floors or homes with low ceilings.
6. Connecting to Heat Source and Testing
Then, the next step is to connect your underfloor heating network to the heat source. The source will be either your existing boiler, a new combi boiler, or a heat pump, according to the design.
A manifold controls the water’s flow, pressure, and temperature through all zones. All systems are pressure tested to ensure no leaks are in the system and to ensure proper flow rate and thermostat operation before finalising the installation. All necessary adjustments to the controls or wiring are made here.
7. Finishing and Flooring
Once everything has undergone thorough testing and tuning, we add the final floor covering.
Tiles, engineered wood, luxury vinyl tiles (LVT), and even carpet (with underfloor heating-compatible underlay) are popular options. (Note that some materials are more heat conductive than others — for example, tiles and stone have better thermal performance, while thick carpets can reduce efficiency.)
8. Commissioning and Handover
The installer will help you install, check zoning, and use it. The process involves everything from setting timers and knowing heat-up times to utilising thermostats properly.
Timeframe and Disruption
The time it takes to replace radiators with underfloor heating varies — generally, expect 3–7 days per floor, though the exact duration will depend on the system type, property size, and screeding. The process can be a bit disruptive, so it’s usually done during major refurbishments.
A properly installed underfloor heating system should last for 50 years or more with very little maintenance, making it a highly efficient and future-proof upgrade.
Need Help Planning Your UFH System?
Next Level Underfloor Heating and Screed Solutions
Book your free survey and get expert design + installation guidance — no obligation.
👉 Speak With an Underfloor Heating Specialist
🏆 Trusted by 100+ Scottish property owners | 5.0★ on Google
* Fully insured & accredited underfloor heating installers covering all of Scotland *
Donald Martin, ⭐️⭐️⭐️⭐️⭐️ Google Review:
“Thanks to Gordon and the team for a great job installing the pipe work for our underfloor heating — neat and tidy job done on time with no issues. I would highly recommend.”
Is It Worth Having Underfloor Heating Replace Radiators? Pros and Cons
So, if you’re asking, “Does underfloor heating replace radiators? The answer comes down to what you care about, where you live, and what your budget is. So, let’s balance a few key pros and cons to give you an idea of whether it’s worth switching over.
The Benefits
Comfort
Undoubtedly, one of the most celebrated advantages of underfloor heating is the luxurious comfort it can provide. Whereas radiators generate constant hot and cold spots with their uneven heating, underfloor heating provides a uniform, ambient warmth that rises from the floor. In cooler months, it becomes especially noticeable when you take those 10 steps onto cold tiles the next morning.
Energy Efficiency
Underfloor heating essentially runs at much lower temperatures than radiators — around 27–31°C for floors, usually 65–75°C for radiators. It pairs ideally with low-temperature heating systems, such as air source or ground source heat pumps, making it much more efficient. Over time, such efficiency can translate into lower energy bills, especially in well-insulated homes.
Aesthetics
Unlike radiators, which can be an eyesore, underfloor heating allows you to plan the layout of your space without any bulky fittings. Taking them out opens up whole walls, allowing greater freedom of furniture placement and interior styling. Many homeowners and designers are attracted to the clean, minimalist look it imparts.
Space-Saving
This benefit coincides with aesthetics, too. In smaller rooms such as bathrooms or box rooms, removing the radiator can make a giant improvement in usable space. The unnoticed existence of underfloor heating in open-plan areas adds to the unhindered feeling of flow and openness.
Increased Property Value
Underfloor heating is typically considered a luxury feature, particularly in new builds or high-spec renovations. For buyers, the mixture of comfort, energy efficiency, and aesthetics can be a powerful selling point — a potential increase in your home’s marketability and value.
The Drawbacks
Higher Upfront Costs
The only downside is the upfront cost. Wet underfloor heating systems can be particularly expensive when installed as part of a retrofit. Costs include materials, labour, screeding, and potentially insulation upgrades. Though savings might balance that out over time, it’s a high upfront cost.
Installation Disruption
Retrofitting underfloor heating means pulling up floors and changing pipework while often temporarily altering your heating system as well. This can be messy, noisy, and inconvenient for households occupying the property during work.
Slower Heat-Up Times
Underfloor heating systems typically take longer to respond than radiators. That’s why they’re not as well-suited to on-demand heating. Smart thermostats can help you in its scheduling, but you’ll have to plan your heating more carefully around usage patterns.
Flooring Compatibility
Underfloor heating is not compatible with all floor finishes. (However, certain wooden flooring types demand special underlays or layers for moisture control.) Carpet should be low-tog, and certain materials (e.g., thick rugs) can act to reduce heat transfer. You might then have to add in extra flooring costs.
| Feature | Radiators | Underfloor Heating |
|---|---|---|
| Comfort | Uneven heat, hot spots | Even warmth, no drafts |
| Energy Efficiency | High temps (65–75°C) | Low temps (27–31°C) |
| Space Usage | Takes up wall space | Fully hidden under floor |
| Ideal For | Quick installs, small rooms | Renovations, open spaces |
| Upfront Cost | Lower | Higher |
| Long-Term Value | Moderate | High (adds resale value) |
For homeowners weighing up a full switch, we also offer complete underfloor heating installation in Glasgow as well as wider regions across Scotland, ensuring your system is designed for long-term efficiency.
David Middlemiss, ⭐️⭐️⭐️⭐️⭐️ Google Review
“It is rare to find a company that takes all the stress away. Our second fix joiners and electricians were very impressed with the work ethic, speed and quality of workmanship. Workmanship and communication — exceptional.”
Frequently Asked Questions About Replacing Radiators with Underfloor Heating
The most common questions we get from clients about replacing radiators with a ufh system
Yes, in most homes and businesses across Scotland, underfloor heating can fully replace radiators. A properly designed system provides even heat distribution throughout every room, without the cold spots or bulky wall units that come with radiators. When installed with good insulation and zoning, underfloor heating can comfortably heat your entire home on its own.
Generally, yes. UFH operates at lower temperatures, which can reduce energy use by 15–25%, especially with renewables like heat pumps.
The ideal time is during renovations, extensions, or new builds, when floors are already being lifted or poured. This minimises disruption and installation costs.
Not directly. Radiator pipes are usually 15–22 mm, whereas underfloor heating uses smaller 12–16 mm loops designed for lower‑temperature, higher‑flow systems. While the same heat source (like a boiler) can feed both systems, new underfloor heating pipework must be installed and connected to a manifold for proper zoning and flow control. If you’re upgrading from radiators to underfloor heating in Scotland, it’s best to replace the pipework entirely for long‑term reliability and performance.
The total cost depends on the size of the area, how much preparation is needed (like removing old flooring or levelling), and the type of screed and underfloor heating system chosen. Retrofitting can be more involved than new builds, so it’s always best to request a tailored quote based on your exact space and needs.
Most modern boilers are compatible, especially if it’s a combi or system boiler. A qualified installer can assess compatibility and suggest any needed tweaks.
For most Scottish properties, including modern homes, extensions, and new builds, underfloor heating completely replaces radiators. It works especially well with energy‑efficient boilers or heat pumps that operate at lower flow temperatures. For older homes, extra insulation or hybrid systems (radiators upstairs, underfloor heating downstairs) can achieve the same comfort and efficiency.
Conclusion: Should You Replace Your Radiators with Underfloor Heating?
So, is replacing radiators with underfloor a ‘no brainer’? In many cases — yes, particularly if you are renovating or building from scratch. Underfloor heating can entirely replace radiators, providing a more comfortable, cleaner, and more energy-efficient way to heat your home.
Is it for everyone? Well, no, and the answer is not always a one-size-fits-all; however, with proper design and a professional, well-put-together installation, underfloor heating can be a wise investment for the long term.
Wondering whether it’s right for your home? Contact Next Level today for a free property assessment and a tailored quote for homes in Glasgow, Edinburgh, and surrounding areas, and start making the switch toward more comfortable, modern heating.
