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Last updated: 8th May, 2024


Do I Need to Do Anything Prior to My Boiler Installation?

Do I Need to Do Anything Prior to My Boiler Installation?

Key takeaways

  • Prepare for boiler installation by understanding different boiler types and assessing your current heating system.
  • Clear areas around your boiler and radiators and ensure easy access to doors for a smooth installation process.
  • Maintain your new boiler’s premium performance by arranging a service, carried out by a Gas Safe engineer.

Installing a new boiler is an important investment in your home, and there are several things you can do to prepare for the installation process. Our guide explores the steps you can take prior to your boiler installation, including clearing the installation area, checking your existing heating system, and arranging for any necessary upgrades or repairs.

Installing a new boiler in your home is a significant investment and an essential task to ensure the proper functioning of your heating system. 

As a homeowner, you might wonder if there's anything you need to do prior to the installation process. 

The answer is yes; there are a few simple steps you should take to prepare for your boiler installation, which will ensure a smooth and efficient experience for both you and the professional engineer working on the project.

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Before your boiler installation, it is crucial to understand the different types of boilers available and their suitability to your home's specific needs. 

Additionally, it's vital to assess your current boiler and heating system, noting any potential issues or areas for improvement. This information will help the professional engineer determine the most appropriate boiler and installation method for your home.

Lastly, preparing your home itself for the installation process is essential. Clearing the area around your current boiler and radiators, as well as providing easy access to your front and back doors, is crucial to accommodating the engineer's work efficiently.

Understanding Boiler Types-

Before getting a new boiler installed, it's essential to familiarise yourself with the various types of boilers available to choose the most suitable for your home. In this section, we will cover the four main categories: combi boilers, system boilers, regular boilers, and heat pumps.

Combi Boilers

Combi boilers, short for "combination" boilers, are compact and efficient units that provide both central heating and hot water on demand without the need for a separate storage tank. They are an excellent option for small to medium-sized homes with limited space and a lower demand for hot water. Combi boilers typically have an efficiency rating of around 93% and offer lower installation costs as they don't require complex pipework.

System Boilers

Unlike combi boilers, system boilers feature a separate hot water storage cylinder, which means they can supply a large volume of hot water as needed. These boilers are ideal for larger homes with multiple bathrooms or a higher demand for hot water. Although they take up more space than combi boilers, system boilers can still offer high efficiency, with many models boasting ratings similar to those of combi boilers.

Regular Boilers

Also known as conventional or heat-only boilers, regular boilers work by heating radiators directly and connecting to a separate hot water cylinder or tank. These boilers, often found in homes with 10 or fewer radiators, tend to be suitable for properties with a traditional heating system and can typically maintain a consistent water temperature. While they have been gradually replaced by combi and system boilers in modern homes, regular boilers still have their place in older properties or homes with more extensive heating infrastructures.

Heat Pumps

Heat pumps are an alternative to traditional boilers, working by extracting heat from the air, ground, or water outside your home and using it for central heating and hot water. These environmentally friendly systems offer low energy consumption, with many models having an efficiency rating of 99%-100%. While they may require a higher upfront investment, heat pumps offer long-term savings on energy costs and contribute to reducing your home's carbon footprint.

Pre-installation advice

Before scheduling a new boiler installation, it's important to consider the right size and power output (measured in kilowatts, or kW) suitable for your property. This depends on the number of radiators, bathrooms, and your hot water requirements. 

An efficient, consistent supply of hot water can be achieved with a well-selected boiler.

Researching and picking a reputable boiler brand, such as Worcester Bosch, is essential to ensure long-term performance and reliability. Be thorough in your search for the best boiler for your needs, focusing on efficiency ratings and customer reviews. It's wise not to base your decision solely on the lowest price, as the quality might not meet expectations.

When preparing for a new boiler installation, you may wish to consult with a Gas Safe registered engineer to discuss your home's specific requirements and receive guidance on choosing the appropriate boiler. They can check factors like water pressure, current boiler positioning, and flue locations, which impact installation.

Before the installation day, it's crucial to ensure that your central heating system is clean and free from any blockages or sludge buildup that could hinder the boiler's efficiency. 

Several flushing methods exist, such as chemical flushing, power flushing, and MagnaCleanse. A professional engineer should carry out this task according to British Standards guidelines.

In addition, familiarise yourself with the relevant building regulations for boiler installations, like efficiency and air supply requirements. 

Compliance with these regulations is vital to ensure your new boiler operates safely and efficiently. It also helps avoid costly and time-consuming issues down the line.

By considering these pre-installation factors, you'll be better equipped to choose the most suitable boiler for your needs, enhancing its performance and longevity.

Don't hesitate to consult experts and professionals for advice and support on making the best decision for your home.

The Role of the Professional Engineer

A boiler installation involves a crucial step of selecting and hiring a professional engineer. These engineers possess the necessary knowledge and expertise to install a boiler safely and efficiently, ensuring that it functions optimally and adheres to the appropriate regulations.

Gas Safe Registered Engineers

Gas Safe Registered engineers are specialists in installing gas boilers. They are accredited by the Gas Safe Register, which is the official gas registration body for the United Kingdom. The purpose of the Gas Safe Register is to ensure that engineers have the requisite skills and knowledge to work with gas appliances safely. Thus, when you hire a Gas Safe registered engineer, you can be confident that they are proficient in their field and will adhere to strict safety standards during installation.

Easy with iHeat

At iHeat, all of our engineers are Gas Safe registered, ensuring a professional service. Time, price and safety are all key aspects of an iHeat boiler installation, meaning you don’t have to worry about anything.

All we ask is that our customers please make sure all rooms that will be used during an installation (the room in which a boiler is being removed from/being installed in and any rooms with a radiator) are fully accessible, clear and clean prior to our engineer’s arrival.

iHeat quotes are another reason getting a new boiler installed as fast as the next day is as easy as possible with us. iHeat quotes are free, fixed price and take 60 seconds! Instead of time delaying site quotes and long drawn out back and forths, all you need to do is answer a few questions about your home and current boiler, then you can select your new boiler and checkout securely.

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Assessing Your Current Boiler and Heating System

Before installing a new boiler, it is crucial to assess your current boiler and heating system. This evaluation will help determine the need for any repairs or upgrades, ensuring that your new boiler operates efficiently and effectively.

Start by inspecting your old boiler for any signs of wear and tear, such as rust or leaks. An ageing boiler can cause a decline in performance, leading to inefficiency, poor heating and, ultimately, a boiler breakdown. By replacing the old boiler with a modern, energy-efficient unit, you can avoid costly repairs and even reduce your energy bills.

Next, check the radiators throughout your home to ensure they're functioning correctly. Look for cold spots, which could indicate clogged or damaged pipes, restricting the flow of hot water. Bleeding your radiators can help remove trapped air and improve heating performance. Additionally, consider upgrading to thermostatic radiator valves (TRVs) for better temperature control and energy efficiency.

Your home's central heating system also plays a vital role in your boiler's performance. Examine the system for any faults, such as malfunctioning thermostats or leaky pipes. A properly functioning thermostat is essential for maintaining a comfortable temperature in your home, as well as running your boiler more efficiently. Address any issues prior to installation to ensure your new boiler delivers optimal performance.

Listen for any unusual noises coming from your heating system, as these could signify a problem, such as air trapped in the pipes or a failing pump. Investigating and resolving these issues will improve the efficiency and effectiveness of your new boiler.

In summary, conducting a thorough assessment of your current boiler and heating system will help to identify any necessary repairs or upgrades, maximising the performance of your new boiler and ensuring a comfortable and efficient home.

The Installation Process and Cost

New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Boiler costs can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat.

Installation Type

Price (inc VAT)

Combi to combi swap


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Some location factors that can influence the price of your new boiler

You will be given a specific quote from the boiler installation company based on:

  • The type of home you have (i.e. terraced, semi-detached, etc.)

  • How many bedrooms you have

  • How many bathrooms you have

  • Your postcode and specific location

Replacing Your Existing Boiler

When upgrading or replacing your existing boiler, several factors come into play. Firstly, a Gas Safe engineer will assess your home to determine the appropriate boiler system. They'll consider the number of radiators, water pressure, and the number of bathrooms, along with the position of the current boiler and flue.

If the new boiler can be installed in the same location as the old one, the installation process is straightforward and costs can be minimised. However, if any pipework alterations or relocating the boiler to a different location are necessary, the installation cost might increase. A replacement boiler's lifespan is typically around 10 - 15 years, and new models can be more than 90% efficient, whereas older models can have efficiencies as low as 50%.

To summarise, the installation process and cost for a new or replacement boiler depend on the boiler type, existing pipework, and location. Always consult with a reliable installer like British Gas to get an accurate quote and ensure your home's specific needs are met.

Post-Installation Care and Maintenance

Warranty and Guarantee

After installing your boiler, it's essential to understand the warranty and guarantee terms. Most boiler manufacturers provide warranties that cover any defects or malfunctions within a specific period. Ensure you register the warranty upon installation and familiarise yourself with its terms and conditions. A guarantee, usually offered by the installer, ensures the quality of their work and may cover potential issues with the installation itself.

Boiler Servicing

To keep your boiler running safely and efficiently, an annual boiler service is recommended. Don't worry; it usually takes just an hour for a Gas Safe registered engineer to inspect the boiler and its surrounding pipework for any visual problems such as cracks, leaks, or corrosion. The engineer will test the boiler and its controls, check the flame picture, inspect the inlet working gas pressure, and conduct a gas rate test or verify the gas burner pressure. It's a good idea to schedule your boiler service during the summer months, as this keeps you ahead of any potential issues that could arise during the colder seasons.

Repairs and Breakdowns

Despite regular servicing, boilers may still experience occasional breakdowns or require central heating repairs. To minimise potential disruptions, it's vital to keep an eye on any signs that your boiler may be malfunctioning. Some common issues include unusual noises, drops in pressure, or inefficient heating. In case of a boiler breakdown, it’s crucial to contact a professional engineer for prompt resolution and repairs.

Keeping your boiler's maintenance in check will not only enhance its overall performance but also prolong its lifespan. Remember, a little care goes a long way in preventing costly future repairs.

Making the Most of Your Boiler

Installing a new boiler for your central heating system ensures that you have a reliable source of hot water for everyday needs. To maximise performance and efficiency, there are several things to consider before and during the installation process.

One essential aspect is selecting the right boiler to suit your water supply and household demand. Ideally, it should offer sufficient hot water capacity while being energy efficient.

Utilising smart heating controls can significantly improve your boiler's efficiency. These allow you to adjust the temperature and heating schedule according to your needs and preferences. Check the compatibility of your new boiler with smart heating systems for seamless integration.

Ensuring proper installation plays a critical role in the lifespan and efficiency of your boiler. Choosing a trustworthy installer, like British Gas, guarantees high-quality workmanship. Don't forget to read Trustpilot reviews for a better understanding of their services. Remember, a well-installed boiler minimises the likelihood of future breakdowns, saving on costly repairs.

Finally, consider whether the boiler you choose aligns with your budget and priorities. Investing in a high-quality and reliable boiler may initially seem expensive, but it could save you money in the long run due to its extended lifespan and better energy efficiency.

In summary, make sure to weigh up your options and conduct thorough research before installing a new boiler. By taking these factors into consideration, you can create an efficient heating system that meets your household's needs, delivers consistent hot water supply, and ensures long-term cost savings.

Benefits of a New Boiler

Investing in a new boiler has its advantages. To start, energy efficiency is a top reason people opt for a modern boiler. At the forefront of technology, new boilers are designed to consume less fuel while providing optimal heat. As a result, homeowners can enjoy reduced fuel bills – up to 20% savings, in some cases.

In addition to cost savings, a new boiler installation offers reliability. While older boilers are prone to frequent breakdowns and costly repairs, newer models are tailored for durability and problem-free usage. Consequently, homeowners can avoid the stress and expenses associated with faulty boilers. Most new boilers come with a five-year warranty, with some providers offering up to 10 years of coverage.

Another remarkable advantage is the environmental impact. As new boilers use less fuel and produce fewer emissions, they can significantly reduce a household's carbon footprint. This aspect is particularly important as society moves towards greener energy alternatives.

Furthermore, new boilers can contribute to improving the comfort of your home. Advanced technology makes them more responsive and precise in maintaining desired room temperatures, providing a more comfortable living environment. Moreover, modern boilers often have quieter operation, resulting in less noise pollution.

Finally, a compact design is an inherent feature of newer boilers. Many models are designed with space-saving measures in mind, making them an ideal choice for homeowners with limited space. This compactness also enables easier installation and maintenance.

In summary, there are various benefits to installing a new boiler, including increased energy efficiency, reliability, and environmental impact. New models also provide enhanced comfort and a more compact design. While the investment may seem considerable, it can save homeowners money, reduce their carbon footprint, and enhance their living conditions.

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Frequently Asked Questions

  • How much does boiler installation cost?

    The cost of boiler installation can vary depending on factors such as the type and size of the boiler, the complexity of the installation process, and your location. Generally, it can range from several hundred to a few thousand pounds. It is advisable to get multiple quotes from various installers before making a decision, as this may help you find a competitive price.

  • How much does it cost to install a boiler in the UK?

    In the UK, the cost of installing a boiler typically ranges between £1,500 and £3,500. However, this can vary depending on the type of boiler, the complexity of the installation process, and labour costs in your region. It is wise to gather several estimates from reputable installers before making a final decision.

  • Can I legally install my own boiler?

    No, it is not legal to install a boiler yourself unless you are a Gas Safe registered engineer. In the UK, boiler installation must be carried out by a certified professional to ensure safety and compliance with building regulations. Attempting to install a boiler yourself could be dangerous and may invalidate your warranty or insurance.

  • Do I need to do anything before a boiler service?

    Before a boiler service, it's a good idea to make sure that the area around your boiler is clear and easily accessible. Removing any clutter or items that may be blocking the boiler will help the engineer work more efficiently. Additionally, take note of any issues or changes in the boiler's performance that you can report to the engineer during the service.

  • What documents do you need when a new boiler is installed?

    When a new boiler is installed, you should receive a number of important documents from your installer. These include the building regulations compliance certificate, the Gas Safe notification, the boiler's user manual and guarantee, and a benchmark checklist. Make sure to keep these documents in a safe place for future reference.

  • Can a handyman install a boiler?

    A handyman should not install a boiler, as only Gas Safe registered engineers are legally allowed to carry out boiler installations in the UK. Utilising a non-certified person for the job could pose a safety risk and also invalidate any warranties or insurance policies related to your boiler.

  • Does a plumber install a boiler?

    A plumber can install a boiler, but only if they are Gas Safe registered. This certification ensures that the plumber has the necessary skills and knowledge to safely and properly install the boiler according to UK regulations. When hiring a plumber for a boiler installation, always check their Gas Safe credentials to ensure a safe and compliant installation.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.