Combination Boiler

Combination Boiler and Gravity-Fed Systems

During a loft conversion, if you have a gravity-fed system, it’s likely that the cold water storage tank in the loft will need to be relocated to the eaves area. Typically, the immersion heater is situated in the airing cupboard on the 1st-floor landing/hallway, which may also require relocation to accommodate the new staircase. In addition, a negative head water pump will need installation alongside the immersion heater to pump hot water to the new bathroom. While this incurs an expense, it can often be offset by investing in a new combination boiler.

A combination boiler integrates a high-efficiency water heater and central heating boiler into one compact unit, eliminating the need for a separate water tank in the loft or a hot water cylinder. This space-saving solution is particularly advantageous for loft conversions, providing ample space for the new stairs and conversion. It’s a smart and popular choice across all our loft conversion designs.

It’s important to note that all domestic boiler installations in the UK must be carried out by an engineer registered with a competent person’s scheme, such as the Gas Safe Register, which replaced CORGI as the gas registration body in 2009. At our company, all combination boilers are installed by our Gas Safe Registered Engineer, ensuring proper installation and compliance with regulations for your peace of mind.

Installation of combination boiler The Loft Conversion Company (Portsmouth) Ltd

Pros and Cons of Installing a New Combination Boiler to a Loft Conversion

When embarking on a loft conversion project, it’s prudent to consider upgrading your hot water and heating system, especially if you currently rely on a traditional gravity-fed system. Among the options available, installing a new combination boiler, or combi boiler, is a popular choice. However, like any major decision, there are both pros and cons to consider before proceeding with this upgrade. Let’s take a look at the advantages and disadvantages of installing a new combination boiler when undergoing a loft conversion.


1. Space Efficiency:

Loft conversions can result in limited space, making compact heating solutions essential. Combi boilers eliminate the need for separate hot water cylinders and storage tanks, maximising available space in the loft area. This space-efficient design is ideal for integrating into the new layout of the converted space. For example, the immersion heater is typically housed in the airing cupboard on the first-floor landing or hallway. This might require relocation or removal to accommodate the new staircase. Another example, the cold storage tanks are typically situated in the centre of the loft space, occupying a significant amount of room. Installing a combination boiler provides a solution to these challenges.

2. On-Demand Hot Water:

Combi boilers heat water on demand, providing hot water whenever needed without the need for pre-heating or storing hot water in a tank. This instantaneous hot water supply is convenient for loft conversions, where space constraints may make traditional hot water storage solutions impractical.

3. Energy Efficiency:

Modern combination boilers are designed to be highly energy-efficient, with many models boasting impressive efficiency ratings. By heating water only when required, combi boilers minimise energy wastage, leading to lower utility bills and reduced environmental impact.

4. Cost Savings:

Although the initial investment for a new combination boiler installation may be substantial, the ensuing long-term savings can be equally significant. With improved energy efficiency and reduced maintenance requirements, combinations boilers can offer substantial cost savings over their lifespan. Manufacturers of combination boilers provide excellent warranties. Enjoy the peace of mind of a comprehensive warranty covering all parts and labour for up to 12 years, potentially allowing you to terminate your current monthly boiler insurance plan.

5. Simplified Installation:

Installing a combi boiler is typically quicker and more straightforward than installing traditional heating systems. Since combi boilers combine both heating and hot water functions into one unit, the installation process is streamlined, resulting in minimal disruption during the loft conversion project.


1. Limited Hot Water Output:

While combi boilers provide hot water on demand, they may struggle to meet the demands of larger households with multiple bathrooms or high hot water usage. In a loft conversion scenario, where additional bathrooms may be added, it’s essential to consider the potential impact on hot water availability.

2. Mains Water Pressure Dependance:

Combi boilers rely on mains water pressure to deliver hot water, meaning that households with low water pressure may experience reduced performance.

3. Compatibility Issues:

Combi boilers may not be compatible with all heating systems, particularly older radiators or underfloor heating setups. Before proceeding with installation, it’s essential to ensure compatibility with existing components or budget for necessary upgrades.

4. Lack of Backup Hot Water:

Unlike traditional boilers with hot water cylinders, combi boilers do not provide backup hot water storage. In the event of a boiler breakdown or maintenance issue, you may be left without hot water and heating until the problem is resolved, which can be inconvenient, particularly during the colder months.

5. Complex Repairs:

While combi boilers are generally reliable, repairs can be more complex and costly compared to traditional boilers. With all heating and hot water functions integrated into one unit, troubleshooting and repairing issues will require specialised knowledge and expertise.

Installing a new combination boiler in a house undergoing a loft conversion offers several advantages, including space efficiency, on-demand hot water, energy efficiency, cost savings, and simplified installation. However, it’s essential to consider potential drawbacks such as limited hot water output, mains water pressure dependence, compatibility issues, lack of backup hot water, and complex repairs. Before reaching a conclusion, we will thoroughly assess the advantages and disadvantages to identify the most suitable heating solution for your loft conversion endeavor.

Power Flushing Radiator Pipes: Enhancing Heating System Efficiency

Ensuring optimal performance of your home’s heating system is essential for maintaining comfort and energy efficiency. Over time, radiator pipes can accumulate rust, sludge, and debris, leading to reduced heat output, uneven heating, and higher energy bills. Power flushing is a highly effective method used to clean radiator pipes and restore heating system efficiency. In this section, we’ll delve into the process of power flushing radiator pipes, its benefits, and why it’s a crucial maintenance task for your home.

Understanding Power Flushing:
Power flushing is a comprehensive cleaning process designed to remove debris, sludge, and rust buildup from the interior of radiator pipes, boiler components, and heating system pipework. It involves connecting a powerful pump to the heating system, which circulates a cleansing solution through the pipes at high velocity, dislodging and flushing out any accumulated contaminants. The process typically includes the use of a combination of water and cleaning chemicals to ensure thorough cleaning and restoration of system efficiency.

The Power Flushing Process:

1. Assessment: Our qualified heating engineer begins by assessing the condition of the heating system to determine if power flushing is necessary. Signs that may indicate the need for power flushing include cold spots on radiators, noisy boiler operation, and reduced heating performance.
2. Preparation: Before commencing the power flushing process, our heating engineer isolates the boiler and radiator valves, ensuring that only the affected pipework is cleaned.
3. Connection: The power flushing pump is connected to the heating system, usually at the boiler or radiator pipework.
4. Flushing: The cleansing solution is circulated through the system at high velocity, dislodging and suspending debris and contaminants.
5. Agitation: In some cases, our engineer may use additional agitation techniques, such as vibrating or tapping radiator pipes, to further loosen stubborn deposits.
6. Drainage: As the cleaning process progresses, the dislodged debris is flushed out of the system through a drain valve, along with the cleaning solution.
7. Refill and Inhibitor: Once the flushing is complete, the system is refilled with clean water, and a corrosion inhibitor is added to protect against future buildup and rust formation.
8. System Check: Our heating engineer conducts a final inspection of the system, ensuring that radiators heat evenly, and the boiler operates smoothly.


Benefits of Power Flushing:

1. Improved Heating Efficiency: By removing obstructions and buildup from radiator pipes, power flushing restores optimal heat transfer, improving the efficiency of your heating system.
2. Energy Savings: A cleaner heating system operates more efficiently, reducing energy consumption and lowering heating bills.
3. Enhanced Comfort: With improved heat distribution, rooms heat up more quickly and evenly, enhancing overall comfort levels in your home.
4. Prolonged System Lifespan: Regular power flushing helps prevent corrosion and damage to boiler components and radiator pipes, extending the lifespan of the heating system.
5. Quieter Operation: Power flushing can eliminate the noises associated with a poorly maintained heating system, such as banging or gurgling sounds.

Power flushing radiator pipes is a vital maintenance task that can significantly enhance the performance, efficiency, and longevity of your home’s heating system. By investing in regular power flushing, you can ensure that their heating systems operate at peak performance, providing reliable warmth and comfort throughout the colder months while reducing energy costs and minimising the risk of costly repairs. Consult with our qualified heating engineer to determine if power flushing is necessary for your home and schedule this essential maintenance service to keep your heating system in top condition.

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