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Frequently Asked Questions About Boiler Installation

Planning a new boiler installation? Find answers to common questions about boiler installation, costs, and finding qualified installers.

What are the different types of boilers?

There are several types of boilers to choose from, including:
  • Combi Boilers (Combination Boilers): Most common and provide both heating and hot water on demand, saving space by eliminating the need for separate hot water tanks or cylinders. They may struggle to meet high hot water demand for larger households.
  • Regular Boilers (Conventional, Heat-Only Boilers): More complex systems that involve both a storage tank and a hot water cylinder. They deliver a consistent supply of hot water but are usually less energy-efficient than newer boiler types.
  • System Boilers: They have components built in, reducing installation time and complexity. They are generally a good middle ground between other options. System boilers are suitable for properties with more than one bathroom or high hot water usage.
  • Condensing Boilers: Highly efficient units that improve energy efficiency by reusing heat from the flue gases. They're better for the environment and can save you money in the long run.
Consult with a heating engineer to determine the best boiler type for your property.

How do I bleed my radiators?

If your radiators have cold spots or are not heating up efficiently, they may need to be bled to improve heating performance and circulation. Bleeding radiators can also reduce noise levels and improve your system's energy efficiency. This straightforward process can help improve your heating:1. Turn off your central heating system and allow the radiators to cool down completely. 2. Locate the bleed valve on the radiator. A special key is often needed.3. Place a radiator key if you don't have a radiator key on the bleed valve and slowly turn it counterclockwise. . You should hear a hissing sound as air escapes..4. Hold a cloth or container under the valve to catch any water that may drip.5. Continue turning the key until water begins to flow steadily.6. Tighten the valve clockwise .7. Repeat this process for all the radiators in your home.8. Once you have bled all the radiators, turn your central heating system on and monitor boiler pressure. The pressure should be between 1 and 1.5 bar when the system is cold. If the pressure is too low, you may need to top it up using the filling loop, if your boiler has one. If unsure, contact a qualified engineer.Bleeding radiators can help improve their efficiency and your heating system overall.

How long does it take to install a boiler?

Boiler installation typically takes one to three days, depending on the complexity of the job and whether you need to remove an existing boiler. . Additional factors that may affect installation time include the accessibility of the installation location and the condition of your existing plumbing. Always confirm installation times with a professional.

What are the signs that I need a new boiler?

Several symptoms can indicate that your boiler is failing :
  • Your boiler is more than 15 years old:
    • Consider replacing an older unit with a new, high-efficiency boiler.
  • Your boiler keeps breaking down:
    • Frequent service calls might mean it's time for a new boiler.
  • Your energy bills are increasing:
    • An inefficient boiler uses more energy resulting in costly increases to your heating bills. Consider replacing it with an energy-efficient model.
  • Your boiler is making strange noises:
    • Unusual banging, whistling, or gurgling sounds could indicate a problem with your boiler and require professional service.
  • Your radiators are not heating up properly:
    • Radiators taking a long time to warm up, or some radiators not heating at all could indicate a problem with your boiler's circulation.
  • Low water pressure:
    • Low water pressure can be a symptom of issues with the boiler. Have a heating engineer inspect the system.
  • Leaks or drips near your boiler:
    • If you notice leaks or drips around your boiler, turn off your boiler and immediately contact a qualified heating engineer to assess and fix the issue.
  • Pilot light goes out frequently: A faulty pilot light is often a sign of bigger issues to come.
  • Yellow flame instead of blue: A yellow flame could indicate the presence of carbon monoxide, which is a dangerous gas. . If you see a yellow flame, turn off the boiler and contact a qualified technician immediately..
Prompt action might prevent complete boiler failure, which can be very disruptive during colder seasons.

What are the different types of boilers?

There are several types of boilers available , including:
  • Combi Boilers (Combination Boilers): Most common and provide both heating and hot water on demand, saving space by eliminating the need for separate hot water tanks or cylinders. They may struggle to meet high hot water demand for larger households.
  • Regular Boilers (Conventional, Heat-Only Boilers): More complex systems that involve both a storage tank and a hot water cylinder. They deliver a consistent supply of hot water but are usually less energy-efficient than newer boiler types.
  • System Boilers: These boilers heat your central heating directly and also store hot water in a cylinder. They are more compact than regular boilers but more expensive than combi boilers. . System boilers are suitable for properties with more than one bathroom or high hot water usage.
  • Condensing Boilers: Highly efficient units that improve energy efficiency by reusing heat from the flue gases. These are more expensive initially but reduce energy consumption and operating costs.
Consult with a heating engineer to determine the best boiler type for your property.

How do I bleed my radiators?

If your radiators have cold spots or are not heating up efficiently, they may need to be bled to remove trapped air. This straightforward process can help improve your heating:1. Turn off your central heating system and allow the radiators to cool down completely. 2. Locate the bleed valve on the radiator. It's usually a small, square-shaped valve on one of the top corners. .3. Place a radiator key or a flat-head screwdriver on the bleed valve and slowly turn it counterclockwise. . You should hear a hissing sound as air escapes..4. Hold a cloth or container under the valve to catch any fluid that may drip.5. Continue turning the key until the hissing stops and water starts to come out steadily. .6. Tighten the valve clockwise .7. Repeat this process for all the radiators in your home.8. Once you have bled all the radiators, turn your central heating system on and check the pressure gauge on your boiler. . Confirm that your system pressure is in the normal range for optimal boiler performance. If not, consult with a professional HVAC technician. If the pressure is too low, you may need to top it up using the filling loop, if your boiler has one. If you are unsure how to do this, consult the manufacturer’s instructions or call a Gas Safe registered heating engineer. By bleeding radiators, you can improve their effectiveness and the overall performance of your central heating system.

How long does it take to install a boiler?

Boiler installation typically takes one to three days, depending on the complexity of the job and whether you need to remove an existing boiler. . Additional factors that may affect installation time include the accessibility of the installation location and the condition of your existing plumbing. Your installer can provide a more accurate timeline after assessing your specific situation. .

What are the signs that I need a new boiler?

Several signs can indicate it's time to replace your boiler :
  • Your boiler is more than 15 years old:
    • Consider replacing an older unit with a new, high-efficiency boiler.
  • Your boiler keeps breaking down:
    • If your boiler requires frequent repairs, it might be more cost-effective to replace it in the long run.
  • Your energy bills are increasing:
    • An inefficient boiler uses more energy resulting in costly increases to your heating bills. Consider replacing it with an energy-efficient model.
  • Your boiler is making strange noises:
    • Unusual banging, whistling, or gurgling sounds could indicate a problem with your boiler and require professional service.
  • Your radiators are not heating up properly:
    • Radiators not getting hot evenly or consistently could indicate a boiler malfunction, air in the system, or circulation problems.
  • Low water pressure:
    • Low water pressure might mean your boiler is not functioning optimally. A qualified technician should investigate the problem. .
  • Leaks or drips near your boiler:
    • If you notice water pooling around your boiler, it's important to get it checked by a professional immediately.
  • Pilot light goes out frequently: If you have an older boiler and the pilot light goes out frequently, it may need to be repaired or replaced. .
  • Yellow flame instead of blue: A yellow flame on a gas boiler can mean there is incomplete combustion or a dangerous carbon monoxide leak. Seek immediate assistance from a qualified professional.
If you are experiencing any of these issues, contact a qualified heating engineer for a boiler inspection and get advice on whether a replacement is necessary.