Combi Boilers

What is a combi boiler?

A combi boiler is a compact, gas-powered water heating unit that provides both hot water to your taps and your central heating system directly from the mains. Unlike some older systems, there’s no need for separate tanks or cylinders to store the hot water in, making them ideal for almost all homes, especially if space is limited.

By heating water only when it’s needed, a combi boiler heating system delivers instant hot water on demand. Modern compact boilers also use advanced Intergas-developed technology, like our unique bithermic heat exchanger, to increase efficiency, reduce moving parts and ensure long-term reliability.

Our range of combi boilers and how they work

Our Intergas combi boilers are all expertly designed to be efficient, compact and reliable in the long term, offering a perfect solution for every home. From the everyday efficiency of the ECO RF model to the feature-rich Xclusive model and Xtreme model, our range makes combi boiler installation and replacement straightforward, while helping to reduce your running costs. Here are the essentials:

Key Components:

Compact Efficiency

Smart Controls and Tech

Reliable Hot Water

Why choose a combi boiler from Intergas?

We’ve been innovating in the hot water sector since 1939. When it comes to choosing the right combi boiler replacement or installation, experience makes all the difference to comfort, efficiency and reliability. With Intergas, you benefit from extensive experience in innovative design, a proven track record in performance and expert support from the home heating specialists.

Expert Knowledge

Pioneers in combination boiler design
Products tailored for UK homes
Trusted by installers and homeowners

Hassle-Free Installation

Compact boiler units to save space
Simple combi boiler replacement process
Fast setup with minimal disruption

Proven Reliability

Warranties up to 10 years (+2 years when installed with an Intergas filter)
Innovative bithermic heat exchanger
Fewer moving parts for long-term reliability

Backed by Intergas Innovation

Innovating in heating since 1939
Developed in the Netherlands
Future-ready combi boiler options

Is A Combi Boiler
Right For Me?

Combi boilers remain incredibly popular across the UK and are designed to provide reliable hot water to heating systems and household taps in a single unit. A combi boiler heating system could be the right choice for your home if:

You Want Space-Saving Design: No tanks or cylinders needed, perfect for any home.

You Need Hot Water On Demand: Enjoy an instant supply directly from the mains.

You’re Planning a Switch: Combi boiler replacement is simpler, with fewer parts to install.

You Want Reliability: Modern Intergas combi boilers come with warranties up to 10 years.

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FAQs about combination boilers

Our combi boiler installation experts are ready to answer any questions you may have, or you can browse below for answers to some of our most commonly asked queries.

How does a combi boiler work?

Intergas combination boilers deliver for both heating systems and hot water supply to taps, all in a single, highly efficient unit. Cold water enters directly from the mains and passes through our unique bithermic heat exchanger, where it is rapidly heated by the gas burner. This exchanger has two separate copper circuits in a single aluminium block, which means fewer moving parts and faster heat transfer. Their efficiency is boosted by a larger surface area and increased waterway path through the unit. Because it only heats water when you need it, a combi boiler heating system delivers instant hot water and efficient home heating without storage tanks or cylinders.

How much does a combi boiler cost to install?

This is always a tough question to answer as there are so many variables, such as the unit that best suits your needs, the size of your home and whether the installation is part of an existing hybrid system. A straightforward replacement is usually more affordable than a full system installation, as fewer parts are needed. Intergas offers a wide range of compact boilers to suit different budgets.

What size combi boiler do I need?

Getting the right size of combination boiler depends on your home’s size, heating and hot water needs. Intergas offers a wide choice of models, from compact boilers for smaller households to higher-capacity systems for larger homes. The best way to ensure you choose the perfect system is to speak with an installer or one of our heating specialists, who can assess your property and recommend the most suitable size from our extensive range.

Are combi boilers energy efficient?

Yes. By only heating water when you need it, combi boilers avoid the energy loss associated with storage tanks or cylinders. Intergas units go further, using our innovative bithermic heat exchanger to improve performance, reduce moving parts and lower energy consumption. We also provide hybrid air source heat pump systems that work hand in hand with our hybrid combi boilers to significantly reduce your reliance on gas.

Do combi boilers need servicing?

Just like any heating system, combination boilers need annual servicing to stay safe, efficient and reliable. An annual check helps spot developing issues, protects your warranty and ensures long-term performance. You can book your annual boiler servicing directly with Intergas through our servicing page.

Find a combi boiler

What is a combi boiler?

Our range of combi boilers and how they work

Compact Efficiency

Smart Controls and Tech

Reliable Hot Water