How to Choose a UFH Installer: What to Look For and Questions to Ask
Underfloor heating is not a job for a generalist. A poorly designed or installed system will underperform, cost more to run, and potentially cause expensive damage to your floors or subfloor. The difference between a great install and a bad one comes down to the installer you choose.
This guide walks you through what qualifications to look for, which questions to ask before hiring, and the red flags that should send you looking elsewhere.
Why UFH Requires Specialist Skills
Underfloor heating is not the same as fitting a radiator. A competent UFH installer needs to:
- Calculate heat loss for every room — without this, your system will be under- or over-spec'd
- Design the pipe layout for wet systems (spacing, loops, manifold connections)
- Understand floor constructions — screeded floors, suspended timber, overlay boards all behave differently
- Commission the system correctly — wet systems must be pressure-tested, balanced, and flow-adjusted
- Integrate with your heat source — whether a boiler, heat pump, or solar thermal
A general plumber might be able to fit pipes, but without specialist knowledge, the result is often a system that never gets warm, wastes energy, or damages the floor.
Qualifications to Look For
For wet (hydronic) UFH
| Qualification | What It Means |
|---|---|
| Gas Safe Register | Required for any gas boiler connections. Check the register at gassaferegister.co.uk |
| APHC membership | Association of Plumbing and Heating Contractors — trained and insured plumbing professionals |
| CIPHE membership | Chartered Institute of Plumbing and Heating Engineering — the professional body for the sector |
| NICEIC / Part P | Required if the installer is doing any electrical work (thermostats, zone controls) |
| MCS certification | Mandatory if they're installing a heat pump with your UFH. Check at mcscertified.com |
For electric UFH
| Qualification | What It Means |
|---|---|
| Part P certification | Required for the electrical connection. Even if a tiler installs the mat, an electrician must complete the circuit |
| NICEIC / NAPIT | Professional electrical membership schemes |
| Manufacturer training | Some mat brands (e.g., Warmup, Nuheat) train and accredit installers — this often includes extended warranties |
For heat pump + UFH packages
Look specifically for MCS (Microgeneration Certification Scheme) certification. This is required to access the Boiler Upgrade Scheme grant (£7,500 for air source heat pumps). Only MCS-certified installers can submit BUS grant applications.
10 Questions to Ask Before Hiring
1. Do you carry out a heat loss calculation?
This is the most important question. A heat loss calculation tells you exactly how much heat each room needs to reach the target temperature. Without it, the installer is guessing — and if they guess wrong, your floor will either never get warm or your bills will be much higher than expected.
What to look for: A written heat loss report per room, or at minimum, confirmation they use accredited software (e.g., Hevacomp, CIBSE methods, or a brand-specific design tool like Warmup's).
2. Can you provide references from similar projects?
Ask specifically for customers who had the same type of job — not just any reference. A retrofit on a Victorian terrace is very different from a new build. A whole-house wet system is very different from a bathroom electric mat.
What to look for: At least 2–3 references you can actually contact (not just a name and a testimonial).
3. What products do you use, and why?
Experienced installers have preferences and can explain them. "We use Uponor pipe because of its oxygen barrier and long track record" is a much better answer than "whatever's cheapest."
What to look for: Named brands, reasons for the choice, and whether the installer is trained by the manufacturer.
4. What warranty do you offer on your installation?
There are two separate warranties: the manufacturer's product warranty and the installer's workmanship warranty. Both matter.
- Pipe manufacturer warranties: 25 years is standard for quality brands
- Workmanship: typically 1–5 years; some offer more
- Thermostat manufacturer warranties: typically 2–5 years
What to look for: Written warranty terms, not a verbal promise.
5. Will you pressure-test the wet system before laying the screed?
Wet UFH pipes must be pressure-tested before the screed goes down — once the screed is poured, you cannot access a leaking pipe without major work.
What to look for: A "yes, always" answer. If they hesitate or say it's optional, walk away.
6. How will you commission and balance the system?
After installation, each zone circuit must be balanced to ensure even heat distribution. The system needs to be filled, bled, and set to the correct flow rate.
What to look for: Mention of commissioning as part of the scope, ideally with a handover document showing the settings for each zone.
7. Do you handle the electrical work, or do I need a separate electrician?
Some UFH companies are plumbing-only and subcontract the electrical connections (thermostats, zone controllers, pump). This is fine, but you need to know who is responsible for the full scope — and that the electrician is Part P certified.
What to look for: Clear scope of work, named sub-contractors if relevant, and who provides the electrical certificate.
8. How long will the job take, and what disruption should I expect?
For wet UFH retrofits, expect significant disruption. Floors come up, screed is poured (and takes 4–6 weeks to cure before full heat-up), and rooms may be unusable for days or weeks.
What to look for: A realistic timeline broken into phases. Experienced installers will tell you exactly what to expect.
9. Are you insured?
Public liability insurance is non-negotiable. Confirm they have it, and check the cover level is adequate for your project.
What to look for: At minimum £1m public liability; £2m+ for larger projects. Ask to see the certificate.
10. What happens if something goes wrong after installation?
A good installer will explain their call-out process and response time for warranty issues.
What to look for: A named contact for aftercare, not just a generic "call the office."
Red Flags to Avoid
Watch out for installers who:
- Won't do a site visit before quoting — any quote given without a site visit is unreliable
- Can't explain their heat loss method — this is a fundamental; if they can't explain it, they're not doing it
- Quote only verbally — always insist on a written, itemised quote
- Won't provide references — established installers have happy customers they can point you to
- Skip pressure testing — this is non-negotiable for wet systems
- Don't mention commissioning — a system that isn't balanced will never work properly
- Demand full payment upfront — standard practice is a deposit (25–30%) and staged payments
- Have no verifiable qualifications — Gas Safe, Part P, APHC membership are all publicly searchable
Understanding Warranties
There are three warranty types to understand:
| Warranty Type | Provided By | Covers |
|---|---|---|
| Manufacturer product | Pipe/mat brand | The physical product failing |
| Installer workmanship | Your installer | Installation errors and defects |
| System design | Your installer | Under/oversizing, inadequate heat output |
Design warranties are less common but worth asking about. If the system doesn't reach the design temperature, who pays to fix it?
Also note: most product warranties require professional installation and sometimes manufacturer-approved installer status to be valid. Using an uncertified installer can void the product warranty.
Getting and Comparing Quotes
Once you have a shortlist of qualified installers, the quote-comparison stage matters:
- Get at least 3 quotes — prices can vary 30–50% for identical work
- Ensure quotes are itemised — pipe, screed, manifold, thermostats, and labour should all be separate line items
- Check what's excluded — floor preparation, floor coverings, screeding, and electrical work are often excluded
- Compare like for like — different installers may specify different pipe brands, screed types, or thermostat systems
- Ask about timeline — cheaper quotes sometimes come with longer wait times or rushed installation
The cheapest quote is rarely the best choice for a UFH installation. This is a system embedded in your home's structure — getting it wrong is expensive to fix.
Using Our Directory
Our directory lists UFH specialists across the UK, with details on their location and contact information.
When browsing, look for installers who:
- Specifically mention UFH (not just general plumbing/heating)
- Have multiple reviews and a track record
- Are local enough to survey your property in person
Browse UFH installers by county or city. Find an installer near you and request quotes from at least 3 businesses.
Frequently Asked Questions
Can a regular plumber install underfloor heating?
A competent plumber can fit the pipes, but UFH design, heat loss calculation, and commissioning require specialist knowledge. Always ask specifically about their UFH experience, not just general plumbing qualifications.
How do I check if a Gas Safe engineer is registered?
Visit gassaferegister.co.uk and search by name or Gas Safe ID number. Registration is legally required for any gas work in the UK.
What's the difference between APHC and CIPHE?
APHC (Association of Plumbing and Heating Contractors) is a trade association focused on commercial members. CIPHE (Chartered Institute of Plumbing and Heating Engineering) is the professional body offering individual qualifications, including Chartered status. Both indicate professional-level competence.
Do I need an MCS-certified installer?
Only if you're installing a heat pump. MCS certification is required to access the government's Boiler Upgrade Scheme (£7,500 grant for air source heat pumps). For boiler-fed or electric UFH, MCS is not required.
How many quotes should I get?
At least three. For larger wet UFH projects (£10,000+), consider getting four or five quotes. The variability in pricing is significant, and comparing quotes also helps you understand whether the scope and specifications are consistent.
Ready to find qualified UFH installers in your area? Browse our directory and connect with local specialists across UK counties and cities.