Gas Boiler Installations – Boiler Installation London

Contact us today to get your Gas Boiler Installations across London at competitive prices. Experienced Gas boiler installers of Baxi, Main, Vaillant, Worcester-Bosch, Glow-worm, Keston, Ideal and many others.

Are you planning to install a new efficient gas boiler for a rental property, your residential home or small commercial premises in London? We work with a range of manufacturers and products to provide you with a variety of solutions to meet your budget. Contact us today to get an immediate FREE QUOTE. As industry experts we have 10+ years of experience in all aspects of an Energy Efficient and modern gas boiler installation in London. Our experienced team of designers and installers will work with you to plan and install the most suitable and cost effective Gas Boilers.

What is the most suitable boiler for my property?

Choosing the right new or replacement boiler in your property can be a difficult task as there are so many options available. Luckily our team is at hand to guide you through this process to ensure you choose the best and most efficient option. When choosing a gas boiler there are 3 systems to consider which are listed below. The next factor is correctly sizing the boiler for the property. 

An undersized boiler will firstly not provide the correct output needed for hot water or heating and secondly will be less efficient as it is likely to be overworked. Another consideration is the brand, this can be decided based on personal preference, cost and the warranty period provided. We have extensive experience in installing Baxi, Main, Worcester Bosch, Vaillant, Ideal, Keston and many others. Contact us today to discuss your needs further.

There are three main types of condensing gas boilers

  • combination boilers (combi) 
  • heat only boilers (also known as conventional)
  • system boilers 

The type of boiler you choose is usually driven by a number of factors and the reasoning for the installation. In majority of cases a new boiler installation refers to replacing an existing boiler either due to the age and inefficiency or if it is beyond economical repair. In most of these circumstances the replacement is a like for like, ie an existing inefficient non-condensing combi boiler would be replaced with a modern A Rated Condensing Gas Boiler. Having 10+ years of experience in this industry our in-house team would be able to advise and guide you through this decision making. 

What is the difference between each type of Gas Boiler?

What is a combi boiler?

A combi boiler is able to supply both heating and hot water to a property from a single standalone unit without the need to have additional cylinders and tanks are no hot water tanks. Therefore there is a space saving advantage to having a combi boiler but a possible disadvantage for larger properties with multiple bathrooms. 

Our experienced inspectors and engineers can advise and guide further on your specific requirements. There is a wide range of combi boilers available on the market and individual choices can be based on price, size and the warranty period. This guide to the best combi boiler brands currently on the market may help providing further information. 

What is a heat only (conventional) boiler?

A heat only boiler (convectional) can only provide heating as stand alone but can be combined with a hot water cylinder. There are two variations of these systems, open vented and unvented (sealed) systems. Open vented systems are accompanied by a cold water feed tank which supplies the cold water to the hot water cylinder. These are placed at a higher level to the cylinder and utilise the force of gravity to displace the used hot water in the cylinder. 

In addition a smaller feed and expansion (F&E) tank is required to refill the central heating circuit. The disadvantages of this system are the additional space required for all components of the system and lack of pressure on the hot water supply. In most instances an additional shower pump is required to supply adequate pressure in the shower. Where feasible it would usually be recommended to upgrade these systems to a combi boiler or an unvented system. For more information and best available brands please see this guide.

What is a system boiler?

A system boiler is similar to a heat only boiler ie provides heating only and not hot water, but unlike a heat only boiler system boilers are fitted with an internal pump. System boilers are often combined with unvented cylinders to supply hot water and are a suitable option for larger properties with multiple bathrooms and hot water outlets. 

Unlike a combi boiler where simultaneous use of hot water and different points can significantly reduce the pressure and temperature this system can be set up and balanced in order to negate this issue.  A correctly sized system and correctly balanced would for example allow two occupants of said property to shower at the same time without loss of pressure or temperature. Please see this guide for further info and help choosing the best brand.

How many years should a Gas Boiler last? 

Modern high-efficiency boilers should last 10-15 years if maintained and looked after. There is some dependency on the quality of the purchased boiler and like most things in life the better the build quality you should expect better life expectancy. Consideration should be given to brand and quality during the purchase as it might be more cost effective in the long run. 

In addition there a number of simple steps you can take to help increase the life expectancy and ensure the system runs trouble free

Annual Boiler Service – Even if your boiler is running smoothly an annual service is a good way of catching any issues early before any damage is caused to the system. In addition for all boilers under warranty the manufacturer requires an annual boiler service by a Gas Safe registered engineered as per terms of that warranty.

Prevent corrosion – Similar to many other systems, boilers are subject to rust and corrosion over time. This thus has the potential to cause boiler damage. Putting an inhibitor into your system would be the most effective means of preventing this. A protective covering will form around the metals, avoiding the accumulation of limescale and corrosion. 

Please note that an inhibitor is not a remedy for limescale build-up, but rather a preventative strategy.

Prevent  build up of sludge – Over time, sludge and debris can accumulate in the pipes and radiators connected to your central heating system, causing eventual harm to your boiler. By installing a magnetic filter, a small component that fits into the system’s pipes (usually the return pipe), sludge should be filtered before it reaches the boiler. 

During your annual service, the engineer can install and clean the magnetic filter, extending the life of your boiler.

Power-flushing the central heating system – If you have an older boiler or central heating system, limescale build-up and excessive sludge is likely to exist within the system. This can cause blockages and eventual corrosion in the central heating system, leading to the breakdown of the boiler. Simply put, sludge accumulation can severely shorten the life of your boiler. This issue can be resolved during the life of the boiler but also new boiler or central heating installations should be power-flushed prior to use.

Installing a Gas Boiler in a New Home

You can install gas boilers in new properties for now, but it is  unlikely that new build properties from 2025 will achieve the 75% – 80% carbon reduction targets given by installing a gas boiler. It is more likely that new build properties will be heated with a renewable source of heating such as a heat pump.

The UK government has announced plans to phase out the installation of new gas boilers from 2025 as part of its commitment to achieving net zero carbon emissions by 2050. This means that from 2025 property developers will not be able to install new gas boilers and will instead need to consider more environmentally friendly alternatives for heating new build homes.

This move is part of a broader strategy to reduce the UK’s carbon footprint and tackle climate change. Heating homes accounts for a significant proportion of the UK’s carbon emissions, and gas boilers are a major contributor to this.

It’s important to note that this ban only applies to new installations. If you already have a gas boiler in your home, you can continue to use it and have it serviced and repaired as necessary

If you’re concerned about the upcoming gas boiler ban in the UK, it’s important to note that this ban only applies to new-build properties from 2025. The government has no current plans to phase out gas boilers in existing homes so you won’t be required to replace your existing gas boiler.

However, in line with the UK’s commitment to reducing carbon emissions, the government is likely to encourage homeowners to consider more energy-efficient and low-carbon alternatives to traditional gas boilers. This could be through grants or incentives for home insulation improvements or the installation of low-carbon heating systems, such as heat pumps or solar thermal panels.

How is the gas boiler efficiency measured?

Until 2009, the UK used a grading system from SEDBUK (Seasonal Efficiency of Domestic Boilers in the UK). A modern gas boiler would typically score as an A whilst an old pilot-light boiler would typically be  G rated.

From 2009, the SEDBUK scale was replaced by the ErP (Energy-Related Products Directive) scale. On this scale, a new boiler would generally score an A or A+ whilst an older appliance with a pilot-light boiler would be more like a C or D.

What should I do if my Gas Boiler is not registered with Gas Safe?

If your gas boiler wasn’t registered with Gas Safe Register at the time of installation, you will need to contact the installer to notify the appliance, providing they are still able to do so.

Our company will be able to come and notify the boiler for you if the original company that completed the installation is no longer in business. Make sure to explain the situation in detail and, if at all possible, have all the information regarding the prior installation on hand

We should then be able to notify the appropriate local authority via the Gas Safe Register website so that a Building Regulations Compliance Certificate can be issued. 

Gas Boiler’s Building Regulations Compliance Certificate

It’s easy to check if your gas boiler has been notified and issued with a Building Regulations Compliance Certificate. . You can order a replacement certificate through the Gas Safe Register. The Building Regulations Compliance Certificate is an important document for property owners. 

If the notification you are searching for relates to work carried out before 1 April 2009 you will need to contact CORGI Services Ltd on 01256 548040.

What is a Gas Safety Record?

Gas Safety Record is a document an engineer leaves behind after installing, servicing, or performing a safety inspection on an appliance. The only  documentation required by the law is a Landlord Gas Safety Record. It will specify precisely what inspections the engineer performed and whether or not the equipment inspected match the required safety requirements. 

Modern energy efficient Gas Boiler & reduction in Heating Costs?

Modern condensing gas boilers are deemed to be between 92-94% efficient or A-rated. Generally Boilers over 25 years old can be as little as 60% efficient, or G-rated. 

Just replacing your gas boiler alone will not guarantee achieving the desired efficiency. Most newly installed gas boilers operate 10-25% under their A rated efficiencies because many installers do not have the correct training to set up these boilers correctly. A correctly installed and set up system will massively improve the efficiency of your system.

Importance of Gas Boiler Energy Efficiency Rating 

The proportion of total energy used by a gas boiler to produce usable heating is known as the gas boiler’s “energy efficiency.” Only 8% of the energy used by a modern boiler with a 92% efficiency rate is “lost”. Only 70% of the energy used by an extremely old boiler with a 60% efficiency goes toward heating the home; a staggering 30% is lost.

Similar to other household appliances, gas boilers have efficiency ratings from A to G. Today’s modern condensing gas boilers must be A-rated and display this information on their literature. Older boilers’ efficiency ratings are difficult to ascertain.

Gas boiler rating and corresponding efficiencies:

A – 90% or more

B – 86-90%

C – 82-86%

D – 78-82%

E – 74-78%

G – under 70%

Why are modern gas boilers so much more efficient?

Condensing gas boilers are the only type allowed to be installed today. In order to pre-heat the heating system, they are able to recover heat that was previously lost through the flue with the help of a secondary heat exchanger. However it can only do this if the heat has returned as water vapour (hence the term condensing). As a result, the boiler must operate at a significantly lower temperature and this type of gas boiler is more effective at lower temperatures. 

It is important to remember the majority of boilers are kept at their factory settings (80 degrees Celsius), which prevents condensation and causes the majority of useful heat to be lost through the flue, therefore to perform optimally they do need to be set up correctly.

What is the Cost of a New Boiler Installation?

There are many factors that determine the cost of replacing a boiler. As seen above there are 3 different types of boilers and each are available in a variety of sizes, makes and models. Whilst it may be relatively straightforward to change like for like boilers, a system change overs can be complicated and may involve many other associated works eg. relocation of the boiler, re-running larger gas supply, re-running water supply pipes. 

Our like for like boiler installations range from £1500-£3500 plus VAT depending on the factors outlined previously. As an experienced company with 10 years plus experience in installing gas boilers in London we are able to provide the same day, no obligation desktop estimate by asking a few questions from the customer. Due to the complexity of this job to provide our customers with accurate quotations we carry out detailed site visits. Contact us today for further information. 

Why Invest in a New Boiler

The decision to buy a new boiler can be influenced by a variety of factors. Here are some of the key reasons why you might consider investing in a new boiler:

Frequent Faults and Failures: If your boiler is constantly breaking down and requiring costly repairs, it might be more cost effective to replace it. Boilers typically last between 10 and 15 years so if yours is nearing the end of its lifespan and starting to show signs of wear and tear a new boiler could be a wise investment

Changes to your requirements: If your current boiler is struggling to meet your heating and hot water needs or your requirements have changed, such as an increase in the number of occupants, a new boiler could provide a more efficient solution. Especially if your household uses a lot of hot water or if you use your heating frequently, a boiler with a higher kW output might be more suitable

Energy Efficiency and Running Costs: Older boilers tend to be less energy efficient than newer models. If your boiler has a low energy efficiency rating, you could be paying more than necessary for your energy bills. A new A-rated boiler could help to reduce your heating bills and lower your carbon footprint

Beyond Economical Repair: Sometimes, the cost of repairing an old or faulty boiler can exceed the cost of a new boiler. If your boiler is prone to faults and you’re constantly paying for repairs, it might be more economical to replace it. As boilers get older and less common the manufacturers limit the production of parts, this means that replacement costs can be extremely high. In some instances corrosion or other factors have damaged the boiler significantly and 2 or more parts need replacing. In these instances replacing the boiler can be more cost effective.

Relocating the Boiler: If you’re not happy with the current location of your boiler, installing a new one could give you the opportunity to move it to a more convenient or desirable location.

Selling or Renting Your Property: A new boiler could make your property more appealing to potential buyers or tenants. A home with a new, energy-efficient boiler could attract more interest and potentially command a higher selling price or rental income.

Remember, it’s important to consult with a qualified heating engineer or boiler specialist before making a decision to ensure that you choose the right boiler for your needs and circumstances. 

How long does it take to install a Gas Boiler?

Similar to the boiler costs mentioned above the boiler type can determine the time taken for a boiler install. The complexity of the boiler installation will also depend if the type of boiler installed is like for like boiler replacement or is a change of system e.g. a system boiler or conventional boiler (regular boiler) being changed to a combi boiler. A boiler install should be completed within one working day, whereas a boiler replacement requiring a change of system can take our installers 2-4 working days. 

Other factors to consider are any associated boiler works or gas works that are required or instructed as part of the new boiler replacement, these could include upgrading radiators, radiator controls, heating controls, power flushing, magnetic filters etc. 

Moving a Boiler to a New Location

We are able to accommodate and quote for relocating a boiler to a new location within your property.. There could be several reasons for wanting to do this, ranging from practical considerations to aesthetic preferences. For instance, you might want to free up space in a kitchen or a cupboard, or perhaps you’re renovating or adding a new extension and the boiler would be better suited elsewhere

However, it’s worth noting that installing a new boiler in the new location is often a more straightforward and cost effective process. You also have the added benefit of an extended guarantee as well as having to replace the old boiler in a few years and paying for the labour cost again.

If you’re considering moving your boiler, call us and book a survey with one of our experienced surveyors. They can assess your property and your heating needs, and advise you on the best location for your boiler. They’ll take into account factors such as the location of the flue and the accessibility of the necessary pipework and drainage

If you decide to proceed with moving your boiler, our team can certainly accommodate this. We have the expertise and experience to carry out boiler relocations, ensuring that the job is done safely and efficiently. We’ll also ensure that the new location complies with all relevant regulations and standards, giving you peace of mind that your boiler system is safe and reliable.

What happens after the gas boiler installation is complete?

Once the gas boiler has been installed it is commissioned according to the manufacturer’s instructions. All our installations are accompanied by a Gas Safety Certificate valid for 12 months. 

Each boiler installation is also registered with the manufacturers and notified to Building Control and Gas Safe Register. The commissioning checklist is completed and left for the user at the property. Completion documents are provided by building control and the manufacturer to the nominated address. 

In addition after the boiler install and commissioning we run through the boiler’s boiler controls with the user at the property. We also  provide post installation support and add the boiler installation to our system in order to automate boiler service reminders. Boiler warranties can vary from 2-10 years but do need to be serviced annually. 

Do you provide a Boiler Cover like British Gas or Homecare after the installation is completed?

We do not provide boiler cover such as those provided by British Gas or Homecare but as an approved installer of many of the best brands such as Vaillant, Baxi, Main, Ideal and others we are able to offer gas boilers with warranties extending 7-10 years. 

The only requirement for these manufacturers to offer a comprehensive warranty is to ensure the boiler installed is serviced annually and the correct inhibitor chemicals are added to the system. This in turn ensures that other than the servicing cost as a user and customer you are not hit with any unexpected boiler repair bills for up to 10 years

Is the Boiler Installer qualified and registered with the Gas Safe Register?

All our installers are registered gas engineers and we ensure every installer is kept up to date with the latest training provided by the boiler manufacturers. We also ensure all our installers carry out the relevant gas training courses every 5 years as required by the governing body

What devices or controls should be fitted during my boiler installation?

If you do not have one these fitted already below are 3 of the main ways you can ensure your new boiler installation continues to work at maximum efficiency:

Thermostat: A thermostat allows you to set a desired temperature and automatically turns the heating on and off to maintain that temperature. In addition a correctly set up thermostat can help to save energy and reduce your heating bills.

Magnetic Filter: This device will remove unwanted debris, sludge and dirt from your heating system. Not only will this protect your boiler and radiators, it will also ensure your system is running efficiently.

Thermostatic Radiator Valves (TRVs): These allow the user to individually control the temperature of each room which means unused rooms or spaces can be turned down or off. This increases efficiency and also reduces heating cost. 

Do you provide any other boiler related services?

Gas Safety Certificate:

A certificate issued after inspection and testing of the complete gas installation within a property, including the gas appliances. The installation is checked for both correct operation and safety. In the UK a Gas Safety Certificate is a legal requirement to rent a property and needs to be renewed every 12 months.

Boiler Servicing: 

An annual boiler service is carrying out a series of checks and cleaning to the boiler in order to maintain and increase the life of a boiler. It is also a requirement by the manufacturer to honour any boiler guarantees 

Power flushing: 

A method of deep cleaning your central heating system, including pipework, radiators and boiler. Power flushing improves the quality of the water contained within the system by removing the sludge and rust build up that can cause boiler breakdown or long term damage to your boiler and radiators.

Magnetic Filters: 

A device that collects debris and rust from the heating system. It can prevent damage to the boiler, leaking radiators and sludge build up within the central heating system.It is now a legal requirement to have a magnetic filter fitted with every new boiler installation

Boiler Servicing: 

An annual boiler service is carrying out a series of checks and cleaning to the boiler in order to maintain and increase the life of a boiler. It is also a requirement by the manufacturer to honour any boiler guarantees. Don’t neglect servicing your new boiler at least once a year as this could invalidate your warranty 

Gas Appliance Installation:

Installing and servicing a variety of water heating and cooking appliances. Including pipework and all associated works 

Gas Leak Repair:

Locating and repairing gas leaks from your gas pipework or gas appliances.

Frequently Asked Questions

Do I need a new gas boiler installation? 

If you have an older gas boiler that is inefficient, has stopped working or is problematic and requires regular repairs, you may want to consider replacing it with a new more efficient model with an extended warranty from the manufacturer. 

Can I install a gas boiler myself?

Installation of gas boilers are only permitted by Gas Safe registered engineers who are competent on boiler installations. It is illegal for anyone else to initiate or complete a gas boiler installation.

How do I choose the right gas boiler for my home?

When selecting a gas boiler for your property, consider the size of your property, your hot water and heating requirements and your overall budget. Consider the boiler’s efficiency as well, as a more efficient model will cost less to operate in the long run. In addition some boilers may cost more but the additional extended warranty (some up to 10 years) can save you a significant some of meony on repairs in the future.

Do I need a gas safety certificate for my gas boiler installation?

Yes, a gas safety certificate is required by law for the installation of a gas boiler. This certificate, issued by a gas safe registered engineer, confirms that the installation was completed safely and in accordance with all applicable regulations. It is important to note the gas safety certificate is issued for the appliance installed and unless agreed otherwise, will not test existing appliances or equipment. A gas Safe registered engineer however does have a duty of care to comment on or in cases disconnect other appliances if deemed dangerous.

How long does a gas boiler installation take? 

The time it takes to install a gas boiler depends on the complexity of the installation as well as the size of your home. It may also depend on addition of devices or alterations to the system. A gas boiler installation can take between 1 and 2 days on average.

Are gas boilers more efficient than electric boilers? 

Gas boilers are generally more efficient than electric boilers because they can use the heat from natural gas or propane combustion to heat water more efficiently. The overall efficiency of a gas boiler, on the other hand, can vary depending on the model and how well it is maintained.

Can I use a gas boiler with renewable energy sources? 

Yes. It is possible to use a  traditional gas boiler with renewable energy sources such as solar panels or wind turbines. This can be achieved through the use of a hybrid heating system. A hybrid green system combines a gas boiler with a renewable energy source to provide both hot water and heating for your property . You can use a lot of different combinations of hybrid systems, but different combinations will work best for different kinds of homes.

Can I switch from oil to gas for my boiler installation? 

It is possible to install a gas boiler in place of an oil one. This will require installing a new gas boiler and switching your heating system to natural gas. A qualified gas engineer or gas safe registered business should be consulted to make sure the conversion is secure and complies with all applicable laws.

What is the best way to care  for my gas boiler after installation? 

After installation, you should maintain and clean your gas boiler according to the manufacturer’s instructions. The system may need to be flushed, the filters examined and changed, and the pressure and temperature levels verified. To make sure your gas boiler is operating safely and effectively, you should also have it inspected and serviced by a qualified gas engineer once a year.

What are the best gas boiler brands in the UK? 

Some of the best gas boiler brands in the UK include Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm and Main. These brands are known for their build quality and reliability.  These are also brands that are backed by strong warranties and customer support.

Can I get a grant or financial assistance for a gas boiler installation? 

As part of the UK government’s Energy Company Obligation (ECO), if you get a benefit that qualifies and your boiler is 10 years old or older, you may be eligible for a grant to help pay for a new and efficient A rated boiler. UK energy companies pay for the free boiler grants, which do not have to be paid back.

How do I find a gas engineer near me for my boiler installation? 

Toi find a gas engineer qualified to carry out a boiler installation refer to the Gas Safe Registers find an engineer. It is important to check the qualifications of the business or engineer to make sure they match your requirements. 

What  is a fixed price boiler installation and do you offer this service? 

A fixed price boiler installation is a service in which the price is set in advance and will not change regardless of any additional work that may be required. This type of service can give homeowners or landlords peace of mind because it allows them to budget for the boiler installation with certainty. Yes we do offer a fixed price service on like for like boiler replacements 

Will my boiler be covered by warranty after installation? 

The majority of boiler manufacturers provide a warranty period for their products. The length of the warranty period varies according to the manufacturer. 

Can a new boiler be fitted to existing pipework and radiators? 

Yes,. Boiler fitting can be to new or existing systems but it is highly recommended to inspect the radiators and pipework in order to ensure they are suitable and with excessive corrosion or any damage. A full power flush is highly recommended on older systems.  

How do I know what size boiler I require for my home? 

The size of the boiler required for a property is determined by the heating and hot water demands of the property. A qualified professional can assess the property and recommend the best size for your needs. 

Will my energy bills go down after I install a new boiler? 

Lowering energy bills can be achieved by fitting  a new  energy efficient boiler, but this is dependent on the efficiency of the old boiler and the efficiency of the new one.

How do I know if I have a condensing Gas Boiler already?

Since 2005, condensing gas boilers have been installed almost exclusively in the UK, 

There are two main characteristics visible externally on a condensing boiler:

If the flue is plastic your boiler will be a condensing boiler. It’s unlikely to be a condensing boiler if it’s made of metal.

A plastic pipe is visible below the boiler and usually passes  through the wall or enters a drain internally.

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