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Combination boilers cost from €2,000, depending on the size, brand and any installation costs involved. A combination boiler combines your hot water and heating into one, giving you instantaneous hot water on demand, and is ideal for small homes and apartments that do not have space for large cylinders.
The average combination boiler in Ireland costs between €2,000 and €3,000.
The price you will pay depends on the following factors:
Given that the individual expectations, and budget, of someone purchasing a new combination boiler will be different, it's difficult to give a definitive recommendation as to which is the best boiler available on the market.
What we can advise is the factors to take into consideration before buying a new boiler. By having an idea of this, you will be better placed to compare what is available on the market.
Factors to consider include:
In the following table, we have compiled some quotes for popular models of combination boilers.
| Combination Boiler Model | Price |
|---|---|
| Worcester Bosch 4000 15kW* | From €2,640 |
| Ideal Logic 18kW* | From €2,640 |
| Potterton Profile 18kW | From €2,390 |
| BAXI 600 System 18kW | From €2,490 |
Sources: Gasworks.ie
Last Updated: October 2025
You should contact a plumber or engineer to advise you on the best option for your specific circumstances.
You can also enquire to some energy providers who also offer boiler related services. For example, have a look at the Bord Gais boiler services, or contact Energia Ireland for further details.
Are There Boiler Grants in Ireland? Unfortunately, there are no longer boiler grants available in Ireland. The government is also planning on phasing out gas and oil boilers by 2025. However, there are grants available from the SEAI for heat pumps and solar water heaters.
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Combination boilers are generally more efficient than traditional boilers for a number of reasons:
Given that traditional, older boilers have an efficiency from 60% to 70%, combination boilers, which are over 90% efficent, can help you save several hundred euros on your annual heating bill.
In addition, many modern combi boilers allow for targeted heating of specific rooms along with programmable timers so you can heat the rooms you want, when you want further increasing the efficiency of the boiler.
Even if you have the most efficient combination boiler, you will still need to use it in a certain way in order for it to run at maximum efficiency.
It’s recommended to set the temperature to:
You should not keep the central heating on all the time. It’s more efficient to set the heating to come on only when you need it.
The domestic hot water, however, can be left on all the time as the boiler only provides hot water on demand. It can take up to 20 seconds for the water to actually get hot once you turn it on.
Combination boilers have controls that allow you to set the temperature of the water. The recommended temperature for domestic hot water is 60°C. This is the temperature that kills legionella bacteria.
Since these boilers don’t require a water tank, it’s unlikely that legionella bacteria will develop. Therefore, it is possible to set the water temperature a bit cooler if you like. For general safety, however, the recommended minimum temperature to kill bacteria is 60°C.
Generally speaking, a combination boiler can provide water for two showers, but the flow rate will be poor. Since they heat hot water on demand, ensuring that you have enough hot water for two showers is also a big request.
To have enough hot water for two simultaneous showers, you will need to have a larger boiler installed. Here are some general measurements to help you determine which size boiler would be the best option for your home:
| Number of Bedrooms | Number of Radiators | Number of Bathrooms | Boiler Size |
|---|---|---|---|
| Small flats and apartments | Up to 10 | 1 | 15-18 kW |
| Three to four bedrooms | Up to 15 | 1 | 18-24 kW |
| Larger homes | Over 20 | 2 or more | 30 kW+ |
While the combination boiler is the most common modern choice, it is one of three main boiler types available. Which one is best for you depends entirely on your home size and hot water needs.
Even the most modern and efficient combination boiler requires routine maintenance to ensure it runs safely and reliably.
The most important step is booking an annual boiler service. This is typically required to keep your boiler's warranty valid (often up to 10 years). During a service, a registered engineer will check for efficiency, wear and tear, and, most critically, test for any deadly carbon monoxide leaks.
In addition to the professional annual check, you should monitor these common issues:
A combination boiler (also known as a combi boiler, provides both hot water and heating from one single unit. It is linked to your mains water supply and the water is heated as it passes through the boiler. This allows you to have hot water as soon as you turn on the tap (or in about 20 seconds).
Combination boilers are popular for small to medium-sized homes as they can meet the heating demands and don’t require large hot water cylinders and tanks. Models are available for gas and oil fired systems, as well as for electricity and LPG but not biomass boilers:
Let’s have a look at some frequently asked questions people have regarding combination boiler installations.
The person required to carry out the installation depends on the type of boiler.
Even though many companies are releasing more aesthetically pleasing boilers, most individuals still prefer to have them hidden away in their homes. The top locations to have a boiler installed include the following:
Can A Combination Boiler Produce Carbon Monoxide?
As they can burn fossil fuels such as gas and oil to produce heat, there is a risk of carbon monoxide poisoning if they are not taken care of with regular servicing.
Selectra's Combination Boiler Tip
"Make sure to regularly bleed your boiler to ensure that it continues to operate at full efficiency. Trapped air inside the radiators will affect your heating system"
Combination boilers are a good option for those looking to reduce the cost of their household heating bills, but are often a more involved and complex system to install and maintain.
Below you will find some of the pros and cons of combination boilers:
Given the Irish government's plan to phase out the installation of new gas and oil boilers by 2025, homeowners are increasingly considering heat pumps as the long-term alternative.
| Feature | Combination Boiler | Air-to-Water Heat Pump |
|---|---|---|
| Initial Cost (Installed) | Low (€2,000 - €4,000) | High (€10,000 - €18,000) |
| Running Cost | Medium (dependent on gas/oil prices) | Low (highly efficient, low emissions) |
| Hot Water Supply | Instantaneous, but flow rate is limited | Requires a hot water cylinder |
| Ideal For | Smaller, well-insulated homes/apartments | Larger homes with good insulation and low-temperature radiators |
| Government Grants | None | SEAI Grants available for up to €6,500 |
While boiler grants are no longer available in Ireland, significant financial support is offered by the Sustainable Energy Authority of Ireland (SEAI) for homeowners looking to make long-term, energy-efficient upgrades.
If you are replacing your heating system, you can receive grants for:
Choosing a heat pump over a fossil fuel boiler ensures your home is future-proof and allows you to avail of these valuable SEAI grants.
A combi boiler does not run both hot water and heating at the same time. The system will either transport the hot water to your radiators to heat your home, or it will transport it directly to your tap. The system will prioritise hot water requirements over room heating requirements.
Yes. From 2025, the installation of gas combination boilers and oil combi boilers will no longer be permitted in new builds in Ireland.
The services and products mentioned on this website may only represent a small selection of the options available to you. Selectra encourages you to carry out your own research and seek advice if necessary before making any decisions. We may receive commission from selected partner providers on sales of some products and/or services mentioned within this website. Our website is free to use, and the commission we receive does not affect our opinion or the information we provide.
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