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

Grant Vortex boilers heat a lot of Northern Ireland's oil homes. We service them to Grant's checklist, set the burner with a combustion analyser and leave you an OFTEC CD/11 record.

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

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

Who makes Grant boilers

Grant Engineering is an Irish heating manufacturer, and its oil boilers are designed and built at its plant in Birr, County Offaly. It also has a UK business that sells into Northern Ireland and Britain. Alongside oil boilers, Grant makes heat pumps, solar thermal and hot water cylinders.

In Northern Ireland, where so many homes heat with oil, a Grant Vortex is one of the boilers our technicians meet most. Searches for Grant boilers here run into the hundreds a month, which tells you how many are out there.

  • Vortex Pro: the main condensing oil range, in kitchen, utility, boiler house and external versions.
  • Vortex Eco: a lower-cost condensing range in similar formats.
  • Vortex Combi: oil combis that heat water on demand.
  • Older Grant boilers: we service older non-condensing Grant models too. Parts availability for very old boilers can be limited, and we will tell you on the day if that affects anything.

Some Grant Vortex models are approved to run on HVO (a renewable alternative to kerosene). If you have switched fuel or are thinking about it, mention it when you book.

A Grant service is carried out by an OFTEC registered technician and follows the manufacturer’s service instructions for your model. It typically includes:

  • replacing the burner nozzle and the fuel filter element;
  • cleaning the combustion chamber, baffles and heat exchanger;
  • checking and setting the electrodes, and cleaning the photocell;
  • checking the condensate trap and pipe on condensing models;
  • setting the burner with a calibrated combustion analyser, recording CO2, flue temperature and efficiency;
  • checking the flue, seals and controls;
  • a visual check of the oil tank, fuel line and fire valve;
  • an OFTEC CD/11 service record left with you.

It takes about 45 minutes for most boilers, sometimes longer on an external model in poor condition. More detail is in our boiler service checklist guide.

Grant offers guarantees on new boilers that depend on conditions, and the common one across manufacturers is an annual service by a registered technician, recorded each year. Some guarantees also need the boiler to be registered with the manufacturer after installation.

Check your guarantee terms for the details on your boiler. If the record has gaps, the safest step is to get it serviced now and keep every record from here on.

Most Grant callouts are oil supply or combustion problems rather than faults in the boiler itself:

  • Lockout light on. The burner tried to fire and failed. Low oil, air in the line, a blocked filter or a worn nozzle are the usual reasons. Read oil boiler not firing before you call.
  • Smoke or an oil smell. Usually a combustion problem that needs setting up, sometimes a leak. See oil boiler smoke or smell, and treat any smell indoors seriously.
  • Condensate problems. A frozen or blocked condensate pipe on an external Vortex can stop the boiler in a cold snap.
  • Noises. Rumbling at ignition often means the burner needs setting up. See boiler noises.

We do not reproduce fault code tables here. Grant’s manual for your model is the reference, and our technician will diagnose the cause on site.

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

Boiler ranges

  • Vortex
  • Vortex Pro
  • Vortex Eco
  • Vortex Combi

Your manufacturer’s warranty

Grant guarantees generally require an annual service by an OFTEC registered technician, recorded on a service record. Check your guarantee terms, including any registration requirement, 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
A Grant oil boiler service is £89, fixed and including VAT, with a CD/11 service record. The price is the same for indoor, utility and external models.
Grant Engineering is an Irish company, and its oil boilers are designed and built at its factory in Birr, County Offaly.
The usual causes are low oil, air or water in the fuel line, a blocked filter, a worn nozzle or a dirty photocell. Check the tank first. If a single reset does not hold, book an engineer rather than pressing the button again.
We would not advise it. A proper service needs a combustion analyser to set the burner, and a Grant guarantee generally depends on a recorded service by an OFTEC registered technician.

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]