Gas Safe RegisterOFTECRegistered engineers
Located in Belfast, servicing all of Northern Ireland[email protected][email protected]
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Warmflow oil boiler service in Northern Ireland

Warmflow boilers are built in Lisburn and heat homes right across Northern Ireland. We service them to the maker's checklist, with every reading recorded.

Choose your preferred window. We confirm your exact slot by phone.

Book a serviceFrom £89Including VAT
Engineer servicing an oil boiler burner: Warmflow oil boiler service in Northern Ireland

Who makes Warmflow boilers

Warmflow is a Northern Ireland manufacturer. It started out as a sheet metal business in Castlereagh and now builds oil boilers, hot water cylinders and renewable heating products at its factory in Lisburn, County Antrim.

That local link is part of why Warmflow oil boilers are so common here. Searches for Warmflow boilers in Northern Ireland are among the highest of any brand we service, and our technicians see them in towns and farmhouses alike.

  • Agentis: Warmflow’s condensing oil range, in internal, utility, boiler house and external versions, including combi and system models.
  • Utility and kitchen models: floor-standing boilers that sit inside the house.
  • Boilerhouse and external models: built to sit outside or in an outbuilding.
  • Older Warmflow boilers: non-condensing models are still in many homes, and we service them too.

An OFTEC registered technician carries out the service using the manufacturer’s instructions for your model. It typically includes:

  • replacing the burner nozzle and fuel filter element;
  • cleaning the combustion chamber, baffles and heat exchanger;
  • checking the electrodes and cleaning the photocell;
  • checking the condensate trap and pipework on condensing models;
  • setting the burner with a calibrated combustion analyser and recording the results;
  • checking seals, flue terminal and controls;
  • a visual check of the oil tank, fuel line and fire valve;
  • an OFTEC CD/11 service record, left with you.

Most services take about 45 minutes. See what a boiler service includes for the full checklist and why each step matters.

Manufacturer guarantees on oil boilers usually depend on the boiler being serviced every year by a registered technician, with a record of each visit. Some also need the boiler to be registered after installation.

Warmflow’s exact terms depend on the model and when it was fitted, so check your guarantee terms. Keep every CD/11 together; it is the evidence a manufacturer will ask for.

The faults we see on Warmflow boilers are mostly the usual oil boiler issues:

  • Lockout and no heat. Often fuel supply, a blocked filter or a worn nozzle. Our oil boiler not firing guide covers the safe checks.
  • Smoke or fumes. A sign the burner needs setting up, the flue needs attention, or both. See oil boiler smoke or smell.
  • Frozen condensate pipe. External and boilerhouse condensing models can lock out in hard frost.
  • Noise on firing. A rumble or bang at ignition needs an engineer. See boiler noises.

We do not list Warmflow fault codes here. The manual for your model is the reference, and our technician will diagnose the fault on site.

A lot of Warmflow boilers in Northern Ireland sit outside or in a boiler house beside the oil tank. These work hard in wet, windy weather. Between services, keep the area around the casing and flue clear of leaves and growth, check the condensate pipe is not cracked or exposed to frost, and keep the oil tank above a quarter full through winter so sludge is not drawn into the fuel line.

£89, fixed, including VAT and the CD/11 record. Book online or email [email protected]. OFTEC To confirm: oftec.

Boiler ranges

  • Agentis
  • Utility
  • Boilerhouse
  • External

Your manufacturer’s warranty

Warmflow guarantees generally require an annual service by an OFTEC registered technician, with each service recorded. Check your guarantee terms for your boiler.

A clear plan, from booking to record.

Three steps to a boiler serviced to its manufacturer’s spec, with nothing to chase.

  1. Choose your service

    Pick your fuel and see the fixed price before giving us your details.

  2. Agree your visit

    Choose the day and arrival window that suit you. We confirm your exact slot by phone.

  3. Get your service record

    The engineer follows the manufacturer’s checklist and emails your service record the same day.

Before we call round.

The details that make booking a little clearer.

Still stuck? Call.

Talk through your boiler, your service or your plan.

[email protected][email protected]Send us a message
In Lisburn, County Antrim. Warmflow builds its products at its own factory there, which makes it one of the few boiler makers manufacturing in Northern Ireland.
£89, fixed and including VAT, with an OFTEC CD/11 service record.
Check the oil level in the tank first. If there is oil, press the reset button once. If the boiler locks out again, stop and book an engineer, as repeated resets can flood the combustion chamber with oil.
Many manufacturers ask for registration after installation as well as annual servicing. Check your guarantee paperwork or ask your installer.

Useful next steps.

Your boiler has a spec. We work to it.

Choose your service and a preferred arrival window. We confirm your exact slot by phone.

Book a service[email protected][email protected]