How Much Does Combi Boiler Installation Cost? 

Combi boilers have become a popular choice for homeowners looking for efficient and cost-effective heating solutions. The experts at Boiler Central have helped us explore the cost of combi boilers, their benefits, and factors that can influence their price. Read on to learn about combi boiler installation cost.

Combi Boiler Installation Cost

Combi boilers ( short for combination boilers) are an all-round heating system that provides both hot water and central heating.

They have recently gained popularity due to their space-saving design and their energy efficiency, which makes them a reliable option when looking for the right boiler.

The main quality of combi boilers is the fact they can produce hot water on demand, which separates them from the previous types of boilers like the system for example. In a combi boiler,  hot water is delivered at mains pressure, which ultimately means that you could get a powerful shower, without the need for a separate pump.

What Is a Combi Boiler?

A combi boiler is a compact unit, perfect for smaller properties, or even little to zero loft space. A new combi boiler installation eliminates the need for a separate water heater and boiler, but rather heats water directly from the mains, ensuring you have hot water whenever you need it.

Combi boilers are also known for their efficiency as they heat water on demand, reducing overall energy wastage meaning that if you do decide to purchase a combi, the energy saved can cut costs for you in the long run.

Benefits of Combi Boilers

  • Space-saving design
  • Energy efficiency
  • Instant hot water
  • Reduced energy bills
  • Lower carbon footprint
  • Easy to install
  • No cold water tank
  • quicker installation
  • Cheaper installation

Factors Affecting the Cost of Combi Boilers

Size and Capacity

The size and capacity of the combi boiler you choose will have a high impact on the cost. Larger homes may require more powerful units, which can be more expensive.

Efficiency Rating

The efficiency rating of a combi boiler is also an important point to take on board when thinking about purchasing a combi boiler. Higher-rated boilers may come with a higher price tag but can lead to long-term energy savings.

Brand and Model

Different brands and models offer varying features and quality. Premium brands such as Worcester Bosch and Viesmann may cost more upfront, however are often more reliable and come with better warranties.

Installation Costs

The installation of a combi boiler involves labour and the cost of the boiler itself. Professional installation is very important to ensure safety and efficiency, getting a qualified engineer with a gas safe id card is highly important to make sure everything is done properly.

Additional Features

Some combi boilers come with additional features like smart controls, wireless thermostats, or advanced filtration systems. These features can also end up increasing the cost.

Average Cost of Combi Boilers

On average, the cost of a combi boiler, including installation, can range from £500 to £3000 ( excluding installation) or even more, depending on the factors mentioned above.

Cost Savings with Combi Boilers

While the initial cost of a combi boiler may seem high, the long-term savings on energy bills can make it worthwhile in the long run. Combi boilers are highly efficient and can lead to  cost savings over time.

Comparison with Traditional Boilers

Combi boilers are often more cost-effective than traditional boilers due to their energy efficiency and space-saving design. Traditional boilers require separate hot water tanks, taking up more space and increasing installation costs.

Installation Process

The installation of a combi boiler is a job best left to professionals who are gas safe. Proper installation ensures safety and efficiency, making it worth the investment.

Maintenance and Repair Costs

Maintenance is important in order for a combi boiler to run efficiently. Maintenance costs are usually low, and combi boilers are known for being reliable. You should service your boiler at least once every 12 months, as the warranty on your boiler can expire if this is not done.

Environmental Benefits

Combi boilers are environmentally friendly, as they produce less carbon emissions compared to traditional boilers. Choosing a combi boiler can contribute to a greener and more sustainable home overall.

Choosing the Right Combi Boiler

Selecting the right combi boiler involves considering your home’s size, hot water demand (amount of taps, showers etc) and also budget. We would advise you to Consult with a professional to determine the best option for your specific needs.


Combi boilers offer an efficient and cost-effective solution for heating and hot water needs. While the upfront cost may vary depending on several factors, the long-term savings and benefits make them a worthwhile investment for homeowners.

Frequently Asked Questions

  • What is the lifespan of a combi boiler?

Combi boilers typically have a lifespan of 10 to 15 years, depending on usage and maintenance. If you get a Boiler cover plan, your boiler will be looked after and made sure it is all running correctly, ultimately this will save huge repair costs down the line and would also lead to a longer lasting boiler.

  • What are the most popular brands of combi boilers?

There are many brands you may have heard of in regards to combi boilers. For example some of the most popular ones being Worcester Bosch, Viessmann, Valiant and Baxi. The price of these can range, depending on which brand you chose and size of the boiler.

  • Are there government incentives for installing combi boilers?

In some regions, there are energy efficiency incentives that may apply to combi boiler installations.There was a scheme designed to help low income households, basically replacing their current unreliable boilers with more energy-efficient ones.This would help reduce energy bills and keep their homes warm in winter.

  • Do combi boilers work with renewable energy sources?

Combi boilers can be compatible with renewable energy sources like solar panels, further reducing energy costs in the long run.

  • Can I install a combi boiler myself?

The simple answer is no, this is both illegal and dangerous to do so. Installation should be carried out by a qualified professional, who is gas safe, to ensure safety and so the job is done to the correct standard.