Find a Cheaper Gas Provider and Save Money in 2025!
Call our Selectra agents today for expert and trusted advice on switching gas providers and make sure that you are getting the cheapest deal on gas prices.
Cormac is Selectra.ie's energy expert along with being the chief content and editorial manager for the website. His aim is to help find the best deal for you and your home energy needs so that you save money on your annual bills. His knowledge and experience of the Irish energy market allows him to offer the best advice and insight into current prices, emerging trends and overall energy saving tips.
Updated on
min reading
A new gas boiler will cost between €2,000 and €4,000 depending on the make and model. Gas boilers work by heating water that is then used as part of your central heating system or as a source of hot water for baths, showers, and radiators. It is recommended that you have your gas boiler serviced once a year to keep it working efficiently. Always use an RGII Registered Gas Installer when having any work done on your gas boiler.
How Much Does a New Gas Boiler in Ireland?
A new gas boiler in Ireland will typically cost between €2,000 and €4,000. The gas boiler price depends on the following variables:
The manufacturer
The boiler model
The capacity of the boiler
The size of your home will dictate the size of boiler you need and thereby its cost. Below, you'll find a comparison of the estimated price of a gas boiler based on its size:
As we can see from the table above, for smaller homes and apartments, a 18kw gas boiler would be sufficient while for larger homes, it would be better to invest in a larger boiler bigger than 20kw.
Are There Gas Boiler Grants in Ireland?
No. 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.
How Do I Know if I Need a New Boiler?
It's not always obvious when it's time to replace your boiler.
While an annual service is crucial, there are several key signs that your existing unit may be reaching the end of its life and that a replacement is a more cost-effective solution than ongoing repairs.
Look out for these common warning signs:
Your Boiler is Old: Most gas boilers have a lifespan of 10-15 years. If your boiler is older than this, its efficiency will have diminished significantly, and it's more likely to suffer from frequent and costly breakdowns.
Frequent Breakdowns: If you find yourself calling a repair technician more than once a year, the combined cost of call-out fees and parts can quickly add up. At a certain point, it becomes cheaper to invest in a new, reliable boiler with a long warranty.
Rising Energy Bills: An old or inefficient boiler has to work harder to heat your home. This directly translates to higher gas consumption and an increase in your monthly energy bills. A new, A-rated condensing boiler can be over 90% efficient, potentially saving you hundreds of euros a year.
Loud and Unusual Noises: While a low hum is normal, sounds like banging, gurgling, or whistling indicate an internal issue. This could be due to kettling (a build-up of limescale), a failing pump, or other mechanical problems.
The Pilot Light is Yellow: A healthy pilot light should be a crisp blue flame. A yellow or orange flame can be a sign of incomplete combustion, which could be releasing dangerous carbon monoxide. If you see a yellow flame, turn off your boiler immediately and contact an RGII Registered Gas Installer.
Your Home Isn't Heating Evenly: If some radiators are cold or if your home is taking a long time to heat up, it's a clear sign your boiler is struggling to keep up with demand.
What Is the Best Gas Boiler on the Market?
Given that the individual expectations, and budget, of someone purchasing a new gas 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:
Budget With prices starting from just above €2,000 and rising to €3,000+, your budget will largely dictate which boiler you choose.
The length of warranty Boilers can be expensive to service and replacement parts can take time to source, so by purchasing a boiler with a good warranty period you can offset these possible future costs.
Boiler efficiency It's important to buy a boiler with a high efficiency rating, otherwise you will be losing money on any energy wasted by the boiler.
The size of your home The size of your home will determine its heating needs. The bigger your home, the bigger a boiler you'll need. If you are living in a smaller property, a smaller, cheaper boiler might be sufficient.
Below you will find an overview table of some popular gas boiler brands and their estimated price range:
🔥 Gas Boiler Brand Comparison
Brand
Estimated Price Range (EUR)
Worchester Bosch
€2,500 - €3,500
Vaillant
€2,500 - €3,500
Viessmann
€3,000 - €4,000
Ideal
€2,000 - €3,000
Baxi
€2,000 - €3,000
How to Choose the Right Size (kW) Gas Boiler
Choosing a boiler with the correct heating output (measured in kilowatts or kW) is crucial for both efficiency and comfort.
A boiler that is too small won't heat your home adequately, while one that is too large will cycle on and off more frequently, leading to wasted energy and a shorter lifespan.
Here are the key factors to consider:
Size of Your Home: The number of bedrooms and bathrooms is a good starting point. A larger house with more rooms and radiators will naturally require a higher kW output.
Number of Radiators: A simple rule of thumb is to allow for approximately 1.5 kW for every radiator in your home. This is a basic estimate, but it gives you a good idea.
Hot Water Demand: Do you have multiple showers and baths that are used at the same time? If so, you'll need a boiler with a higher hot water output, particularly if you are considering a combi boiler.
Insulation and Heat Loss: A well-insulated home (with good wall, attic, and window insulation) will retain heat more effectively and may be able to manage with a slightly smaller boiler.
General Guide to Gas Boiler Sizing
Size of Home
Number of Bedrooms
Boiler Size (kW)
Best Boiler Type
Apartment
1-2
15-24 kW
Combi or System
Small to Medium House
2-3
24-28 kW
Combi or System
Medium to Large House
3-4
28-34 kW
System or Regular
Large House
4+
34 kW+
System or Regular
*Note: This is a general guide. An RGII Registered Gas Installer can perform a detailed heat loss calculation to recommend the perfect size for your specific home.
What to Expect from a Gas Boiler Installation
Upgrading or replacing your gas boiler is a significant home improvement. Knowing the process in advance can help everything run smoothly.
Here’s a typical step-by-step guide to a gas boiler installation in Ireland:
1. Initial Assessment: A qualified RGII Registered Gas Installer will visit your home to assess your current heating system, hot water needs, and the layout of your property. They will recommend the best boiler size and type for your home and provide a detailed quote.
2. The Installation Day: The installation process usually takes just one to two days.
Draining the System: The installer will first drain your central heating system.
Removal: The old boiler and any associated pipework or tanks will be carefully removed.
New Boiler Installation: The new boiler will be fitted, along with new pipework and any required heating controls.
System Flush: The heating system will be flushed to remove any sludge or debris that could affect the new boiler’s efficiency.
Refilling and Testing: The system is refilled, and the installer will test the new boiler and controls to ensure everything is working correctly and safely.
3. Commissioning and Certification: Once the installation is complete, the installer will commission the boiler and provide you with a Declaration of Conformance (BCI Certificate). This is a crucial document that certifies the work was carried out safely and to the required standards. You should keep this in a safe place, as you will need it for future reference or if you ever sell your home.
4. Post-Installation: Your installer will explain the new boiler’s controls and answer any questions you have. They will also advise you on the importance of your annual service to maintain the warranty and ensure your boiler operates efficiently.
Are Gas Boilers More Expensive Than Oil or Electric?
Gas boilers are similar in cost to oil but given that electricity is always more expensive than either of the other two, it will always be the most expensive means of heating a home.
Having said that, there are several factors that impact on the total cost of heating a home regardless of which type of boiler you have, including:
The following table gives a basic breakdown of the difference in price between the three types of boilers and which will be phased out completely in the future.
High Heating Bills Costing You More Than You Want in 2025?
Call us today here at Selectra and one of our energy experts can help you switch to a cheaper provider for free in 15 mins!
Selectra Service
Energy
Call Today to Switch Energy Providers and Save On Your Energy Bills
We're currently closed but please leave us your number and we'll give you a free callback as soon as we're open!
Selectra Service
Are Heat Pumps a Good Alternative to Gas Boilers?
With the government's plan to phase out fossil fuel boilers by 2025, many homeowners are considering a new heating system.
While gas boilers remain a popular and affordable option, it's worth comparing them to the main alternative: a heat pump.
Feature
Gas Boiler
Heat Pump
Initial Cost
€2,000 - €4,000
€10,000 - €16,000+ (before grants)
Running Cost
€1,200+ per year (typical)
€800+ per year (typical, depends on insulation)
Efficiency
Up to 94%
300%+ (produces 3-4 units of heat per 1 unit of electricity)
Grants
No
Yes, SEAI grants up to €6,500
Fuel
Natural Gas
Electricity
Installation
Quick and simple (1-2 days)
More complex, requires insulation upgrades and an outdoor unit
Lifespan
10-15 years
15-20 years
Key Differences to Consider:
Future-Proofing: Heat pumps are seen as a long-term, sustainable heating solution that aligns with national and international climate goals. Gas boilers, while still a viable option, are part of a fuel source that is being phased out.
Home Insulation: For a heat pump to be truly efficient and cost-effective, your home must be well-insulated (SEAI recommends a BER rating of B2 or higher). If your home has poor insulation, a heat pump will cost a lot to run.
Initial Investment: The upfront cost of a heat pump is significantly higher. However, SEAI grants help to reduce this cost, and the long-term savings on running costs can make it a worthwhile investment over time.
How Much Is a Gas Boiler Service?
The price for a full gas boiler service, which typically includes the call-out fee and basic work, can range from €80 to €120. This excludes the cost of any replacement parts or major repairs that may be needed.
There are several factors that can influence the cost of your boiler service, including:
It is recommended to shop around for two or three quotes before choosing a service, as many operators will offer different rates.
A gas boiler service must be carried out by a Registered Gas Installer (RGI) to ensure that the work is carried out to a high standard of safety.
To find a Registered Gas Installer in your area, you can use the RGII offical website to search for an RGI in your county.
Often issues with your boiler can be fixed at home without the need for a full service such as bleeding your boiler.
Carbon Monoxide Alarms
As gas boilers burn a carbon emitting fuel, there is a risk of carbon monoxide leaking out if the boiler is not properly serviced. Install a carbon monoxide alarm and make sure to keep an eye out for any discolouring on your boiler.
How Does a Gas Boiler in Ireland Work?
A gas boiler works by burning gas in order to heat water, which is then pumped around your house as part of your home heating system, or for use as hot water in baths, showers, taps etc.
To use a gas boiler, you must be connected to the gas network and be in contract with a gas supplier.
Gas boilers are popular forms of heating homes, in particular urban areas, as historically, gas has often been cheaper gas is normally cheaper than both oil and electricity.
There are three main types of gas boilers available in Ireland:
Combi Gas Boiler The combi gas boiler has two functions: it heats your water for domestic use and also works as your central heating system. These gas boilers tend to be more compact than other types, as they do not need a tank to store the hot water.
Traditional Gas Boiler This type of boiler needs to have a separate cold water tank to feed it, as well as a cylinder to store the heated water. They are referred to as ‘regular’ as they are the most common type of gas boiler in Ireland and have been around for a long time.
System Gas Boiler A system gas boiler is similar to a regular gas boiler in that it still needs a separate cylinder to store the hot water. However, it does not need to be fed by a cold water tank. This makes it less bulky and less expensive to install versus a regular gas boiler.
What is a Condensing Gas Boiler?
A condensing boiler works by condensing water vapour in exhaust gases to recover latent heat that would be otherwise lost, making them highly efficient. All gas boilers are, by law, condensing boilers.
What Are the Pros and Cons of Gas Boilers?
For those with access to the gas network, gas boilers offer an affordable and convenient means of heating their homes when compared to oil, electric, or biomass boilers.
Despite this, the fluctuating price of gas can make them more expensive and without regular servicing, their efficiency can diminish over time.
Advantages
Natural gas is cheaper than electricity meaning lower energy bills.
Modern condensing gas boilers are highly efficient.
Wide availabilty and easy to install.
Faster to heat up water than electricity and can be used in conjunction with smart temperatire controls.
Disadvantages
Require yearly servicing by a qualified technician.
Are subject to fluctuating gas prices.
Can pose a safety issue due to the threat of carbon monoxide poisoning.
Often people living in rural areas don't have access to the gas netowork.
Learn More About Energy SavingOur energy guide articles contain lots of useful information on saving energy, lowering costs and having a more positive impact on the environment.
Cormac is Selectra.ie's energy expert along with being the chief content and editorial manager for the website. His aim is to help find the best deal for you and your home energy needs so that you save money on your annual bills. His knowledge and experience of the Irish energy market allows him to offer the best advice and insight into current prices, emerging trends and overall energy saving tips.
Share this article!
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.
Looking for Lower Energy Bills in 2025?
Our Energy Experts Are Here to Help You Save Money with Selectra!
⭐ Price comparison service to help you save money on your energy bills
⭐ Personalised and professional advice from our energy experts
*Our energy experts, who specialise in the Irish energy market, are trained representatives of Selectra.ie and offer a free of charge, price comparison service.
Our Call Centre Is Currently Closed, But You Can Still Talk To One Of Our Energy Expert.
Click Here To Schedule a Free Call Mon-Fri 9am-5.30pm and One of Our Agents Will Be In Contact With You
*Our energy experts, who specialise in the Irish energy market, are trained representatives of Selectra.ie and offer a free of charge, price comparison service.