Saunier Duval boiler repair and service engineers in London
Legacy boilers still in UK homes: we service them, repair where practical and advise on replacement.
- Fully insured and Gas Safe registered
- Every fault diagnosed before we quote
- You agree the price before we start
- Our workmanship is guaranteed
Monday – Sunday, 7:00 AM – 10:00 PM · Out-of-hours emergency? Call 020 3576 5825
Ask for a price on your Saunier Duval
Name, phone and postcode are all we need to start. Everything else can wait.
Thank you — your enquiry is in
Expect a call back on the number you entered. For anything urgent, there is no need to wait: ring 020 3576 5825.
Saunier Duval boilers
People search for Saunier Duval often, yet it is not a boiler you can buy new in the UK today, and the difference matters. There are genuinely many in use, and a good number still work. Ninja Plumbers services them and repairs them when parts allow. When a new boiler is the wiser use of your money, we say so, instead of dragging out repairs that have stopped making sense.
The Saunier Duval range
Saunier Duval is a French brand in the Vaillant group, alongside Vaillant and Glow-worm. It sold boilers in the UK for many years, and models such as the Isofast and Thelia still turn up in London kitchens, but it is no longer sold as a new boiler here. Day to day, legacy status changes little: it can be serviced like any other boiler. Over time, parts become the limiting factor.
Saunier Duval counts as a legacy brand. Boilers already fitted can be serviced and repaired by us, and we give advice on replacing them, but we do not install new Saunier Duval boilers.
Faults we often find on Saunier Duval boilers
- Ageing boilers that are still working every day
- Repairs limited by the parts still available
- Replacement talks where no new boiler carries the same name
- Scale built up on the hot water side of older combis
- The belief that Vaillant or Glow-worm parts will fit
This list reflects what Ninja Plumbers finds across Saunier Duval boilers in general. It is not a diagnosis of yours, and we confirm any fault on site before giving a price.
Saunier Duval servicing
The service itself is routine: combustion, the flue, seals and the condensate trap. Warranties will have expired on almost every Saunier Duval; if yours is unusually recent, check your warranty terms, which usually call for an annual service. In hard-water London, older combis like these have often had years of scale building on the hot water side, and the service shows how far it has gone.
Repair it or replace it?
The deciding question is usually whether the part exists, not what it costs, and we check before quoting. Where it exists and the boiler is otherwise sound, a repair is reasonable. If not, or one repair keeps following another, replace it, with a boiler chosen for the property as it is now rather than as it was when the original went in.
Work we do on Saunier Duval boilers
-
Saunier Duval boiler repair
We find the fault first, then quote for the fix.
-
Saunier Duval boiler service
An annual check, which most manufacturer warranties require.
-
Saunier Duval boiler replacement
You see repair and replacement costs side by side first.
We do not fit new Saunier Duval boilers. If yours needs replacing, we will explain the current options that would suit your home.
Questions about Saunier Duval boilers
- Is there still support for Saunier Duval boilers?
- Not for new installation, as there is no current UK range. Servicing is simple and plenty of repairs can still be done, but the parts that remain set the limit, so check before you spend on an older boiler.
- Will Vaillant or Glow-worm parts fit my Saunier Duval?
- You cannot assume so. Sharing a group does not make parts swappable. The exact model on the data badge decides what fits, and we check that before quoting.
- How long will my Saunier Duval keep going?
- For as long as it stays safe and parts for whatever fails can be found. An annual service deals with the first. The second is why it helps to know what you would replace it with.
- Can you repair and service my Saunier Duval boiler?
- Yes. Our gas work is done by Gas Safe registered engineers, as the law requires for any gas boiler, whatever the make.
Problem with your Saunier Duval?
Tell us the model and whatever fault code the display shows. We can often say what the likely problem is before an engineer is on the way.