In this article, we will provide a comprehensive guide to gas boilers, covering various aspects such as brands, models, gas boiler replacement cost, servicing, and installations. As experts in plumbing and heating in Ireland, 24 Hour Plumber is here to offer valuable insights and answer common questions about gas boilers.
Table of Contents
Gas Boiler Brands and Models: Pros and Cons
Let’s discuss some popular gas boiler brands and models, along with their pros and cons. Please note that the following information is based on general knowledge and may not include the most up-to-date models or specific details. It’s always recommended to research and consult with professionals for the latest information and to determine the best option for your specific needs.
| Boiler Brand | Model | Output (kW) | Suitable Home Size | Warranty | Price From | Pros | Cons |
| Worcester Bosch | 15i System Gas Boiler | 15 | 2 – 3 beds | 10 years | €2370 incl install | Reliable quality, 10 year warranty, magnetic filter included | Higher price point than some competitors |
| Worcester Bosch | 18i System Gas Boiler | 18 | 2 – 3 beds | 10 years | €2390 incl install | Reliable quality, 10 year warranty, magnetic filter included | Higher price point than some competitors |
| Worcester Bosch | 24i System Gas Boiler | 24 | 3 – 4 beds | 10 years | €2450 incl install | Reliable quality, 10 year warranty, magnetic filter included | Higher price point than some competitors |
| Worcester Bosch | 30i System Gas Boiler | 30 | 4 – 5 beds | 10 years | €2590 incl install | Reliable quality, 10 year warranty, magnetic filter included | Higher price point than some competitors |
| Worcester Bosch | 35 CDI System Gas Boiler | 35 | 3 – 5 beds | 10 years | €2795 incl install | Reliable quality, 10 year warranty, magnetic filter included | Highest price point option |
| Ideal | Logic 15 System Gas Boiler | 15 | 2 – 3 beds | 10 years | €1895 incl install | Competitive pricing | Less well known brand than Worcester Bosch |
| Ideal | Logic 18 System Gas Boiler | 18 | 2 – 3 beds | 10 years | €1945 incl install | Competitive pricing | Less well known brand than Worcester Bosch |
| Ideal | Logic 24 System Gas Boiler | 24 | 3 – 4 beds | 10 years | €1995 incl install | Competitive pricing | Less well known brand than Worcester Bosch |
| Ideal | Logic 30 System Gas Boiler | 30 | 4 – 5 beds | 10 years | €2395 incl install | Competitive pricing | Less well known brand than Worcester Bosch |
| Viessman | Vitodens 100w System Gas Boiler | 19 | 2 – 3 beds | 5 years | €2595 incl install | High efficiency and quality | Shorter 5 year warranty |
| Viessman | Vitodens 100w System Gas Boiler | 26 | 3 – 4 beds | 5 years | €2695 incl install | High efficiency and quality | Shorter 5 year warranty |
| Viessman | Vitodens 100w System Gas Boiler | 30 | 4 – 5 beds | 5 years | €2795 incl install | High efficiency and quality | Shorter 5 year warranty |
| Viessman | Vitodens 100w System Gas Boiler | 35 | 4 – 5 beds | 5 years | €2895 incl install | High efficiency and quality | Shorter 5 year warranty |
- Worcester Bosch: Pros:
- Well-known and reputable brand
- High-quality and reliable boilers
- Wide range of models to suit different needs
- Energy-efficient options available
- Good customer support and after-sales service
Cons:
- Can be more expensive compared to other brands
- Limited availability of parts in some areas
- Installation costs may be higher due to the complexity of certain models
- Vaillant: Pros:
- Established and trusted brand
- Energy-efficient boilers with high-performance ratings
- Wide range of models, including combi, system, and regular boilers
- Good reputation for reliability and durability
- Excellent customer support and warranty options
Cons:
- Higher initial cost compared to some other brands
- Some models may require specific flue systems or additional components
- Limited availability of parts in certain regions
- Baxi: Pros:
- Known for their reliability and durability
- Wide range of models to suit different budgets and requirements
- Energy-efficient options available
- Good customer support and warranty options
- Competitive pricing compared to some other brands
Cons:
- Some models may have a higher noise level during operation
- Limited availability of parts in certain areas
- Installation costs may vary depending on the specific model and requirements
- Ideal: Pros:
- Affordable and budget-friendly options available
- Energy-efficient boilers with good performance ratings
- Wide range of models, including combi, system, and regular boilers
- Good customer support and warranty options
- Easy to install and maintain
Cons:
- Some models may have a shorter lifespan compared to higher-end brands
- Limited availability of parts in certain regions
- May not have as extensive a range of features compared to premium brands
It’s important to note that the pros and cons mentioned above are general observations and may vary depending on the specific model and individual experiences. It’s always recommended to consult with heating professionals, consider your specific requirements, and research the latest models and customer reviews before making a decision.
Gas Boiler Costs: Installation and Maintenance
Gas Boiler Installation Costs: The cost of installing a gas boiler can vary depending on several factors. These factors include the size of the property, the type of boiler being installed, and any additional components required for the installation. Generally, larger properties may require more powerful boilers, which can increase the installation cost.
The type of boiler chosen also affects the installation cost. There are different types of gas boilers available, such as combi boilers, system boilers, and regular boilers. Combi boilers are typically the most cost-effective option as they provide both heating and hot water without the need for a separate water tank. System boilers require a separate hot water cylinder, while regular boilers require both a hot water cylinder and a cold water storage tank.
It’s important to note that installation costs can also vary based on the complexity of the installation process. Factors such as the location of the boiler, accessibility, and any necessary modifications to the existing heating system can impact the overall installation cost.
Gas Boiler Maintenance Costs: In addition to installation costs, homeowners should consider the ongoing maintenance costs associated with gas boilers. Regular servicing is essential to ensure the safe and efficient operation of the boiler.
The cost of annual servicing can vary depending on factors such as the service provider, the region, and the specific requirements of the boiler. It’s recommended to hire a qualified and registered heating engineer to carry out the servicing. The engineer will inspect the boiler, clean components, check for any leaks, and ensure that it is operating at optimal efficiency. Regular servicing not only helps prevent breakdowns but also extends the lifespan of the boiler and maintains its energy efficiency.
It’s worth noting that some manufacturers offer extended warranties or service plans that cover the cost of annual servicing. These plans can provide peace of mind and help homeowners budget for maintenance costs.
Gas Boiler Servicing: Importance and Frequency
Gas Boiler Servicing Importance: Regular servicing of gas boilers is crucial for several reasons. Firstly, it ensures the safety of the household occupants. During a service, a qualified heating engineer will inspect the boiler for any potential gas leaks or faulty components that could pose a safety risk. They will also check for carbon monoxide emissions, a colorless and odorless gas that can be harmful or even fatal if not detected.
Secondly, regular servicing helps maintain the efficiency of the boiler. Over time, boilers can accumulate dirt, debris, and scale, which can affect their performance and energy efficiency. During a service, the engineer will clean the components, including the burner, heat exchanger, and flue, ensuring optimal efficiency and reducing energy consumption. This can result in lower energy bills and a reduced carbon footprint.
Lastly, servicing can help identify and address minor issues before they escalate into major problems. By detecting and resolving potential issues early on, homeowners can avoid costly breakdowns and repairs. Regular servicing can also extend the lifespan of the boiler, saving homeowners money in the long run.
Gas Boiler Servicing Frequency: The frequency of gas boiler servicing is typically recommended as an annual occurrence. Annual servicing ensures that the boiler is inspected, cleaned, and maintained on a regular basis. However, it’s important to note that the specific servicing requirements may vary depending on the manufacturer’s recommendations, the age of the boiler, and any warranty or insurance requirements.
Some manufacturers may require more frequent servicing, especially for newer boilers, to maintain the warranty validity. It’s essential to consult the boiler’s manual or contact the manufacturer to determine the recommended servicing frequency.
Additionally, landlords are legally obligated to ensure that gas appliances, including boilers, are serviced and maintained in a safe condition. They must provide a Gas Safety Certificate to their tenants, which verifies that the appliances have been inspected and serviced by a qualified engineer.
Gas Boiler Replacement: Signs and Considerations
Signs for Gas Boiler Replacement:
There are several signs that indicate the need for gas boiler replacement. These signs include:
- Age of the Boiler: Gas boilers typically have a lifespan of around 10-15 years. As they age, their efficiency can decline, leading to higher energy bills and reduced heating performance. If your boiler is approaching or exceeding its expected lifespan, it may be time to consider a replacement.
- Increased Energy Bills: If you notice a significant increase in your energy bills without any other explanation, it could be a sign that your boiler is no longer operating efficiently. Newer, more energy-efficient boilers can help reduce energy consumption and lower your heating costs.
- Frequent Breakdowns: If your boiler is experiencing frequent breakdowns and requiring costly repairs, it may be more cost-effective to replace it. Constant repairs can add up over time, and a new boiler can provide greater reliability and peace of mind.
- Uneven Heating or Lack of Hot Water: If you’re experiencing inconsistent heating throughout your home or a lack of hot water, it could be a sign that your boiler is struggling to meet the demand. This can be an indication of a failing boiler that may need replacement.
Considerations for Gas Boiler Replacement:
When considering a gas boiler replacement, there are several factors to take into account:
- Energy Efficiency: Look for boilers with high energy efficiency ratings, such as those with an A-rated ErP (Energy-related Products) label. Energy-efficient boilers can help reduce energy consumption and lower your carbon footprint.
- Heating Capacity: Ensure that the new boiler has the appropriate heating capacity to meet the demands of your property. A qualified heating engineer can assess your heating requirements and recommend the right size and type of boiler.
- Compatibility: Consider the compatibility of the new boiler with your existing heating system. If you have a specific type of system, such as a gravity-fed system or a pressurized system, make sure the new boiler is compatible and can be seamlessly integrated.
- Budget: Determine your budget for the boiler replacement, including the cost of the boiler itself, installation, and any necessary modifications to the system. It’s important to strike a balance between cost and quality to ensure a reliable and efficient heating system.
SEAI Boiler Grants
Unfortunately there is no oil or gas boiler grants available under the SEAI Better Energy Homes Scheme. The available grant is for Heating control improvements only and boiler replacement is not required to avail of the grant. For more info visit the SEAI website here.
Gas Boiler Frequently Asked Questions
How combi boiler works
A combi boiler heats water instantly only when you need it. When you turn on a hot tap, the built-in heat exchanger warms the cold water from the mains supply. There is no boiler storage tank or cylinder needed. Combi boilers are more efficient as no water is stored until required.
How much gas boiler service
A standard gas boiler service usually costs between €80-€150 depending on the make and model of your boiler. This service ensures your boiler is working safely and efficiently.
How much combi boiler
The cost of a combi boiler installed professionally ranges from €1800-€3000 depending on the make, model and size. Brands like Baxi and Vaillant offer combis from €1800-€2200 for a small 2-3 bed home.
How long does gas boiler last
A quality gas boiler installed and serviced properly can last 10-15 years on average. Low-use boilers in small homes may last 15-20 years, while high-use boilers or those in larger properties may need replacing after 10-12 years. Proper annual servicing helps maximize lifespan.
Best gas boiler on the market
Some of the top-rated gas boiler brands currently on the Irish market include Worcester Bosch, Vaillant, Baxi, Ideal and Grant. These manufacturers offer reliable condensing boilers with efficiencies of 90% or higher. Models from Vaillant, Worcester Bosch and Baxi tend to be among the highest rated.
How much gas boiler cost
The cost of a new gas boiler can range from €1000-€3000 on average depending on the make, model, installation requirements and other factors. As a general guide, a basic boiler starts at around €1000-€1500 installed, while a premium high-efficiency boiler may cost €2000-€3000 fitted.
How much for gas boiler replacement
The cost to replace an existing gas boiler is similar to the installed costs for a new one – around €1000-€3000 on average depending on the specific model, size required, flue installation difficulty and any other system work involved. Smaller replacements may be €1000-€2000 while more complex jobs could reach €2500-€3000.
Why gas heater won’t stay lit
Potential reasons a gas heater won’t stay lit include faulty igniter, poor-quality gas, lack of air supply, improper gas pressure or thermostat issues. Check the manual for troubleshooting tips.
Why is gas boiler not heating water
Possible reasons include thermostat set too low, faulty circulating pump, airlock in system, low water pressure, sludge/debris in heat exchanger or rotten components needing replacement like zone valves. Troubleshoot parts and bleed radiators.
Gas Boiler Error/Fault Codes
Here are some of the most common Worcester Bosch boiler error and fault codes by specific boiler model:
Worcester Bosch
Worcester Bosch Greenstar Danesmoor/CDi Range:
- F1 – Low water pressure
- F2 – Overheat failure
- F3 – Flue overheat / flue thermostat trip
- F8 – Flame failure
Worcester Bosch Greenstar System Boiler Range (28CDi, 30Si etc):
- F1 – Low water pressure
- F2 – Overheat failure
- F9 – Flame supervision failure
- F11 – Flame blockage
- L4 – Ignition lockout
Worcester Bosch Greenstar Rimarded Range:
- F1 – Low water pressure
- F5 – Flue thermistor open/short circuit
- F8 – Pressure switch failed closed
- L4 – Ignition lockout
- F9 – Flame failure
Worcester Bosch Bosch Greenstar i Junior Range:
- F1 – Low water pressure
- F2 – Overheat failure
- F9 – Flame failure
- F5 – Flue thermistor fault
The fault codes can point technicians to specific issues like low water pressure, overheating failures, flame sensing problems or thermistor faults. Clearing the codes may involve bleeding radiators, checking components or replacing faulty parts.
Here are some of the most common Ideal heating boiler error and fault codes by specific boiler model:
Ideal Logic Range:
- F1 – Low water pressure
- F2 – High limit thermostat activated
- F9 – Flame failure
- F15 – Flue NTC thermistor fault
Ideal ICON Range:
- F1 – Low water pressure
- F2 – Safety thermostat activated
- F9 – Flame supervision failure
- F15 – Flue thermistor fault
Ideal Logic + Range:
- F1 – Low water pressure
- F2 – Overheat/high limit activated
- F9 – Flame failure
- F24 – Fan fault
Ideal Logic Max Range:
- F1 – Low water pressure
- F2 – Safety thermostat activated
- F6 – Air pressure switch fault
- F9 – Flame failure
- F15 – Flue thermistor fault
Ideal Boilers Combi C Range:
- F1 – Low water pressure
- F2 – Safety thermostat activated
- F9 – Flame failure
- F15 – Flue thermistor fault
The most common codes relate to low water pressure, overheating issues, flame detection failures and thermistor faults. Checking components and replacing any faulty parts is usually required to resolve the issues.
Viessman
Here are some of the most common Viessmann Vitodens boiler error and fault codes by specific boiler model:
Viessmann Vitodens 200-W:
- F18 – Flame detection error
- F22 – Overheat limit reached
- F28 – Fan fault
- F30 – Gas valve fault
Viessmann Vitodens 222-F:
- F19 – Air/gas ratio outside limit values
- F22 – Safety temperature limit reached
- F28 – Fan fault
- F30 – Gas valve fault
Viessmann Vitodens 200-W B5:
- F28 – Fan fault
- F30 – Gas valve fault
- F34 – Return temperature sensor fault
- F40 – Flow temperature sensor fault
Viessmann Vitodens 111:
- F22 – Safety temperature limit reached
- F28 – Fan fault
- F30 – Gas valve fault
- F34 – Return temp. sensor fault
Viessmann Vitodens 222-F CM2:
- F19 – Air/gas ratio outside limit values
- F22 – Safety temperature limit reached
- F28 – Fan fault
- F30 – Gas valve fault
The most common codes generally relate to flame detection issues, overheating limits, fan or circulator faults and faults with the gas valve, temperature sensors or air/gas mix. Troubleshooting and replacing defective components is usually required to resolve Viessmann boiler errors.
