Underfloor heating is often described as an energy-saving upgrade, but the real answer is more useful than a simple yes or no. A well-designed water-based underfloor heating system can operate at a lower flow temperature than a traditional radiator system, and that can help a boiler or heat pump work more efficiently. But the result depends on the property, insulation, floor construction, controls and how the system is designed.
Across homes in Havering, Essex and East London, we see the same principle repeatedly: the heating system works best when the whole property is considered, rather than treating the underfloor pipework as a product on its own.
| Lazard view: underfloor heating should be designed around the home. Lower-temperature heating is useful only when the system can still meet the heat loss of each room. |
Why can underfloor heating use energy more efficiently?
A radiator concentrates heat into a relatively small surface area. Underfloor heating turns a much larger area of floor into a gentle heat emitter. Because there is more surface area available to release heat into the room, a water-based system can usually operate with a lower water temperature than conventional radiators.
That matters because lower flow temperatures can improve the efficiency of a condensing boiler and are particularly well suited to heat-pump systems. The Energy Saving Trust also identifies lower flow temperature as one of the potential energy-efficiency benefits of underfloor heating.
- Heat is spread across a large floor area rather than concentrated at a few radiators.
- Rooms can feel more evenly heated, with fewer pronounced hot and cold areas.
- Water-based systems can operate at lower flow temperatures when properly designed.
- Individual zones and sensible controls can help avoid heating areas unnecessarily.
Does underfloor heating automatically reduce your bills?
No. We would not recommend choosing underfloor heating on the promise that it will automatically cut a household energy bill. Two similar homes can perform very differently depending on insulation, glazing, floor build-up, room temperatures, heating schedules and the energy source.
Electric underfloor heating also needs to be considered separately from a water-based system. Electric systems can be practical for smaller areas or particular retrofit situations, but electricity tariffs mean they may cost more to run over larger areas. The right comparison is therefore not always as simple as “underfloor heating vs radiators”; it is the complete heating design for the particular home.
The five things that make the biggest difference
1. Heat loss and insulation
Before deciding how a room should be heated, we need to understand how quickly that room loses heat. A well-insulated extension with modern glazing behaves very differently from an older room with exposed walls, draughts and limited floor insulation. If heat loss is high, changing the emitter alone will not solve the underlying problem.
2. Floor construction and floor finish
Tiles and stone transfer heat differently from timber, vinyl or carpet. Manufacturers also set limits for particular floor finishes. The finished floor therefore needs to be part of the heating design from the beginning, especially on renovation projects where floor height can be restricted.
3. Correct system design
Pipe spacing, circuit lengths, manifold arrangement, water temperature, controls and the available floor area all affect performance. A system that looks fine on a drawing can still disappoint if it has not been designed around the actual room requirements.
4. Controls and zoning
Underfloor heating has a different response characteristic from radiators, particularly where pipework is installed within a screeded floor. Good controls allow different areas of the property to be managed sensibly rather than repeatedly overheating and cooling the whole house.
5. The heat source
Water-based underfloor heating can be used with suitable boilers and is also compatible with heat pumps. The important point is to design the system around the characteristics of the chosen heat source. If a homeowner is considering a future heat-pump upgrade, lower-temperature emitters can also form part of that longer-term planning.
Where underfloor heating works particularly well
We often discuss underfloor heating during extensions, major renovations, complete-home plumbing and heating projects, and bathroom refurbishments because those projects already involve access to floors and give us the opportunity to plan the system properly.
- Open-plan kitchens and living areas where wall space is valuable.
- Extensions and new floor build-ups where insulation can be incorporated correctly.
- Bathrooms where warm floors improve comfort and the room layout suits zoned heating.
- Complete-home renovations where the heating system can be considered as one design.
- Mixed systems where underfloor heating is used in suitable areas and radiators remain elsewhere.
Can underfloor heating work in an older Essex home?
Yes, but retrofit work needs more thought. We regularly work in properties where floor levels, existing finishes, older heating systems or limited insulation make the obvious solution impractical. Sometimes a low-build-up system is appropriate; sometimes keeping radiators in part of the property is the better answer.
This is where honest advice matters. The aim should not be to fit underfloor heating everywhere simply because it is available. The aim is to choose a system that works for the property and the way the household actually lives.
What if an existing underfloor heating system is not performing properly?
Poor performance does not automatically mean the whole system needs replacing. Uneven rooms, slow warm-up or areas that remain cold can have several causes, including control settings, balancing, circulation problems, actuator or manifold issues, system contamination, or a design limitation.
Lazard Plumbing also carries out underfloor-heating repairs, system upgrades, flushing and maintenance. Where contamination or circulation is suspected, the right approach is to diagnose the cause before recommending a solution.
Planning underfloor heating as part of a complete-home project
This is where underfloor heating becomes particularly valuable to us as installers. On a complete-home project, the boiler or other heat source, hot-water cylinder, controls, radiators, underfloor heating and bathrooms can all be considered together instead of being added one at a time.
For a busy homeowner, builder or residential developer, that joined-up approach can make the project easier to manage and can avoid design conflicts later.
Why homeowners choose Lazard Plumbing
Lazard Plumbing provides residential plumbing and heating services across Havering, the RM postcode areas, Brentwood, Basildon, Billericay and surrounding parts of Essex, with selected projects further afield. We have served more than 6,000 customers and received more than 1,000 genuine reviews across Google and Checkatrade.
- Clear written quotations before planned work begins.
- A dedicated office team supporting customers and engineers throughout the project.
- Qualified professionals, including Gas Safe registered engineers where gas work is involved.
- CIPHE membership and a focus on professional standards.
- 24-month workmanship warranty, with product and manufacturer warranties treated separately.
- Advice based on what is appropriate for the property, not simply on selling the largest job.
Considering underfloor heating?
If you are renovating, extending or planning a complete-home plumbing and heating project, we can help you decide whether underfloor heating is suitable and how it should fit with the rest of the system.
Get a Quote or Ask a Question. If you are not sure which route you need, send the office team the details and we will help you with the next step.
FAQs
Is underfloor heating more efficient than radiators?
It can be. Water-based underfloor heating can operate at a lower flow temperature because the floor provides a large heat-emitting area. Whether that produces lower energy use or bills depends on the property, heat source, controls and how the system is used.
Is wet or electric underfloor heating better?
They suit different situations. Water-based systems are commonly considered for larger areas and planned renovations. Electric systems can be useful in smaller areas or where installation constraints make a wet system impractical, but running costs need to be considered carefully.
Can underfloor heating be combined with radiators?
Yes. Mixed systems are common, particularly in renovations where underfloor heating suits the ground floor but existing radiators remain practical upstairs. The system needs appropriate design and controls so the different circuits operate correctly.
Does Lazard repair and flush underfloor heating?
Yes. In addition to new installations and upgrades, Lazard can investigate faults, carry out repairs and provide flushing or maintenance where appropriate.