Gas Safe RegisterOFTECRegistered engineers
Located in Belfast, servicing all of Northern Ireland[email protected][email protected]
blueprintBOILER SERVICES
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Vaillant boiler service in Northern Ireland

Vaillant ecoTEC gas boilers and aroTHERM heat pumps, serviced to the manufacturer's checklist with the readings recorded and the price fixed before we arrive.

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

Book a serviceFrom £79Including VAT
Engineer checking the pump and controls during a boiler service: Vaillant boiler service in Northern Ireland

Who makes Vaillant boilers

Vaillant is a German heating manufacturer with a long history, and one of the biggest boiler brands in Europe. In the UK and Northern Ireland it is best known for its ecoTEC range of wall-hung gas boilers and, more recently, its aroTHERM air source heat pumps.

In Northern Ireland you will find Vaillant boilers mostly in gas areas, in Belfast and the towns on the Phoenix and firmus networks, and some on LPG.

  • ecoTEC plus: the main condensing gas range, in combi, system and regular versions.
  • ecoTEC pro: a compact combi range common in flats and smaller homes.
  • ecoTEC exclusive: the top of the range, with more advanced controls.
  • aroTHERM: air source heat pumps, serviced by an engineer trained on heat pumps. See our heat pump service page.

Older Vaillant models, such as earlier ecoTEC and turboTEC boilers, are serviced in the same way.

A Gas Safe registered engineer follows Vaillant’s service instructions for your model. On a typical ecoTEC, that means:

  • checking the gas pressure and burner operation;
  • a flue gas analysis with a calibrated analyser, checking the combustion readings are within the manufacturer’s range;
  • inspecting the heat exchanger and burner where the manual calls for it, and replacing seals that are disturbed;
  • checking and cleaning the condensate trap;
  • checking the expansion vessel charge and system pressure;
  • testing the safety devices and checking the flue for soundness;
  • recording all readings on your service record.

Most services take about 45 minutes. The detail behind each step is in what a boiler service includes.

Vaillant offers guarantees on new boilers that usually require annual servicing by a registered engineer, recorded each year. Some guarantees also depend on registration after installation or on the installer.

Terms vary between models and installation dates, so check your guarantee terms. If you are unsure whether your last service was recorded, book a service and start a clean record.

The problems we see most often on Vaillant boilers:

  • Low pressure. The display shows low pressure and the boiler stops. A top-up through the filling loop often fixes it; repeated drops need a repair visit. See boiler pressure low.
  • Ignition lockouts. The boiler tries to light and fails. One reset is fine; repeated lockouts need an engineer.
  • Condensate pipe blockages. In frost, a frozen condensate pipe can stop a condensing boiler. A gurgling sound before it locks out is the giveaway.
  • Noises. Kettling or whistling, often from scale or poor flow. See boiler noises.

We do not list Vaillant fault codes here. They vary by model, and your user manual is the reference. Our engineer will read the fault history properly on site.

Clear the space around the boiler, have previous service records to hand, and tell us about any fault you have noticed. If your Vaillant runs on LPG, say so when you book so the right engineer comes out.

Gas service £79, fixed and including VAT. Book online or email [email protected]. Gas Safe To confirm: gasSafe.

Boiler ranges

  • ecoTEC plus
  • ecoTEC pro
  • ecoTEC exclusive
  • aroTHERM

Your manufacturer’s warranty

Vaillant guarantees generally require an annual service by a Gas Safe registered engineer, recorded each year. 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
A Vaillant gas boiler service is £79, fixed and including VAT. A Vaillant aroTHERM heat pump service is £129.
Most ecoTEC models have a reset button on the front panel. Press it once and wait a few minutes. If the boiler locks out again, stop and book an engineer, as a repeat lockout points to a fault.
Yes. Annual servicing keeps the boiler safe and efficient, and Vaillant guarantees generally depend on it. Check your guarantee terms for the details.
A slow drop usually means a small leak somewhere in the system or an expansion vessel that has lost its charge. Topping up is fine as a stopgap, but if you are doing it every week, book a repair visit.

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]