087 249 0622 info@dsgasoil.com


Boiler Service

How long does it take to service a boiler?

A boiler service will take approximately 45 minutes. If urgent gas boiler repairs are required then the check may take longer.

For the full details of how a service is carried out and the benefits of servicing your boiler, check out our Boiler Service page.

What do they do in a boiler service?

An annual gas boiler service involves 3 crucial steps.

  1. The gas boiler service starts with a Visual Inspection of the entire gas heating system.
  2. If the heating system passes the visual inspection then our engineers will check that your boiler is operating correctly with a Function Inspection.
  3. Once the functionality of the boiler has been tested, our engineer will perform an Efficiency Test to gauge how well your boiler can heat your home.

For more details on these steps, please take a look at our service & repair page.

How much does it cost to service a boiler?

A full annual gas boiler service starts from €99. Get in contact today to book your gas boiler service.

When does a new boiler need its first service?

A new gas boiler installation or upgrade needs to be serviced every 12 months. An annual service is not just for old boilers and this is important to know as generally, your boiler’s warranty will require you to service your boiler each year for it to be valid.

We provide you with a certification after each service, which you can show to the manufacturer should you ever need a replacement boiler through your warranty.

Does boiler need to be cold for service?

Yes, ideally your gas boiler should not be used for at least 3 hours before the service, to allow necessary inspection.

Boiler Replacement

What is involved in changing to a combi boiler?

A combi boiler is a combination boiler. It is named this way as it combines both the hot water cylinder and the cold water tank into one unit and takes water straight from the main instead. As such upgrading to a combi boiler can be pretty straightforward.

There are then a few variables that need to be considered depending on the way your heating system is set up:

  • A new location may need to be used, requiring additional pipework. This will also require a new core hole to be drilled for the flue.
  • Heating Controls may need to be upgraded.
  • A limescale filter may be needed if you live in a hard water area.
  • Thermostatic Radiator Valves (TRVs) may need to be installed.

We also instal a MagnaClean unit to help filter out deposits and sludge, ensuring that your system will last longer and perform better.

For more information checkout our boiler replacement page.

How long does it take to replace a new boiler?

A new gas boiler replacement or upgrade will take between one to two working days. If there is just a straight boiler swap for a newer model with similar dimensions and fittings, then you can expect 1 day.

If the boiler needs to be moved to a new location then you can expect 2 days, as adjustments to the pipework will be needed.

Is there a grant for a new gas boiler?

Currently, there are no grants available for getting a new boiler installed. Although there is a grant of €750 available for getting your heating controls upgraded. Read more about this grant on our SEAI grants page.

Do you need new radiators with a new boiler?

In most cases you do not need to go and replace all the radiators if you are getting your boiler replaced or upgraded.

Overtime deposits and sludge build-up in your heating system. To prevent this from causing damage to your new boiler we power flush your entire heating system. This is when a cleaning chemical water mixture is pumped through your heating system at high pressure, helping to remove any harmful sludge or deposits.

While much older systems or damaged systems may require new radiators. Get in contact today and we’ll be happy to give you a free quotation.

Which boiler is best?

Viessmann boilers have been rated the best boilers by Which.com for the last 3 years running. It is not hard to see why as they boilers they produce have a high energy efficiency of 98%, saving you a massive amount of money on your heating bills.

Depending on the size of your house, a specific Vitodens model will be recommended. If you are looking to get a boiler replaced or upgraded, please take a look at our boiler replacement page.


How does a gas boiler work?
Gas is supplied to your boiler from the gas meter that is generally installed on an external wall of the premises. A piezo ignition is used to ignite the gas and is controlled from the thermostat when you turn on your central heating system. The water inlet to the boiler generally comes from a cold water storage tank in the attic. The heat generated in the boiler is transferred to this water by use of a heat exchanger. As the water heats up it is then pumped through to the radiators and hot water cylinder tank. Check out our gas boiler replacement page for more information.
Will a gas boiler work without electricity?

No, without electricity the boiler will not be able to ignite the gas required to start heating the water.

Can a gas boiler be fitted outside?

Yes, a gas boiler can be fitted outside. This requires a specific outside model, please contact us for more details.

Can a gas boiler produce carbon monoxide?

Yes, any appliance that burns gas can produce carbon monoxide. Carbon monoxide is extremely hard to detect as it is colourless and odourless.

Carbon monoxide poisoning is a very serious problem that can lead to death, which is why we fit a free carbon monoxide alarm with every boiler replacement or upgrade.

Looking to get your Boiler serviced, repaired or replaced?