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25kW Combi Boilers

A 25kW combi boiler from Intergas will deliver reliable heating and fast-flow hot water for homes with up to 15 radiators, all engineered by the home heating experts. Our Rapid and Rapid Plus models are designed for easy maintenance and long-term performance, with just four moving parts at their core.

  • Easy to use, just fit and forget
  • Compact and space-saving design
  • Excellent parts and unit warranties
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Benefits of Our 25kW Combi Boilers

Bithermic Heat Exchanger
All our combi boilers are built around our pioneering bithermic heat exchanger, which was created by our engineers in 1996 and remains cutting-edge today. Its simple design lessens the number of moving parts, reducing wear and faults. It is covered by a minimum 7-year warranty, ensuring a long life for your combi boiler at 25kW.

 

Energy Efficiency
We engineer our combi boilers to deliver excellent energy performance, with 93% efficiency for central heating and 87% efficiency for hot water on our Rapid and Rapid Plus models, which are both rated A for efficiency. This helps reduce wasted energy and makes heating more cost effective.

 

Compact Size and Flexible Placement
Designed with real homes in mind, Intergas combi boilers are compact and flexible to install. Rapid and Rapid Plus models measure 810mm x 450mm x 270mm and feature a central flue with up to 10 metres of flueing distance, allowing greater freedom when positioning the boiler.

 

Ideal for Smaller to Medium Homes
These systems are typically ideal for properties in the smaller to medium size range, though they can still support up to two bathrooms and between 10 and 15 radiators, delivering dependable everyday heating performance.

Combi boilers
Combi Boiler - Intergas

How Intergas 25kW Combi Boiler Installation Works

Our 25kW combi boilers are simple to install and must be fitted by Intergas-approved engineers, who we support with dedicated training across the UK.

Key Components:

  • Get in touch to choose your ideal 25kW combi boiler
  • Find a Gas Safe-registered, Intergas-approved installer
  • Register your new boiler with us and activate your warranty
01

Order your ideal 25kW combi boiler

Select the ideal combi boiler from our 25kW models, with UK-wide delivery and access to expert advice to help you make the right choice.

02

Book installation with an Intergas-approved installer

Use our simple postcode search tool to find a local Gas Safe-registered installer.

03

Register your boiler

Register your new boiler with Intergas to activate your warranty, with 3 years on Rapid models and 6 years on Rapid Plus units, giving you peace of mind.

Why Choose a 25kW Combi Boiler from Intergas?

Since 1939, Intergas has been engineering and designing efficient, dependable boilers for everyday home heating needs, leading the industry with innovation.

Efficient Everyday Performance

  • High heating and hot water efficiency
  • Consistent output for daily use
  • Reduced unnecessary energy use

Simple, Proven Engineering

  • Innovative bithermic heat exchanger part
  • Just 12 components and 4 moving parts (Rapid)
  • Designed to minimise faults, delivering long-term reliability

Flexible Installation Options

  • Compact, space-saving dimensions
  • Up to 10m flueing distance
  • Easily concealed for aesthetics

Trusted Intergas Support

  • Boiler unit and parts warranties
  • UK-based technical support
  • Expert aftercare when you need it
A-rated efficiency
80+ years of engineering expertise
Fast hot water flow rates
Built-in frost protection
Quiet, reliable operation
Easy to service and maintain
IP44 Safety Class (Rapid)

Is a 25kW Combi Boiler
Right For Me?

An Intergas combi boiler of 25kW rating could be ideal for your home if:

  • You have a small to medium-sized home with between 10 and 15 radiators
  • Your hot water demand needs to support up to two bathrooms
  • You want fast flow rates and frost protection built in
Get a Free Quote
Combi Boiler - Intergas

FAQs about25kW Combi Boilers

Choosing the right combi boiler size helps ensure reliable heating and consistent hot water for your home. A boiler that is too small can struggle at peak times, while an oversized unit may use more energy than needed and cost you more money. As a guide, our engineers recommend:

We know that choosing the right new boiler can be confusing, so we’re here to help with our expert guidance and friendly team. Just call 01527 888000 or contact us at sales@intergas-heating.co.uk for advice.

When choosing a combi boiler, the number of radiators and bathrooms in your house is usually a more reliable metric than bedroom count. If you’re unsure which size suits your home, get in touch with our team or refer to our combi boiler sizing guide for clear, engineer-led guidance.

These boilers are perfect for running between 10 and 15 radiators, approximately, with up to two bathrooms in use at the same time.

The best 25kW combi boiler for your home will depend entirely on your heating requirements, hot water usage and the size of your home. Intergas’ range of innovative, efficient combi boilers has been designed and engineered to provide a balance of efficiency, performance and reliability for everyday use. So, if you’re not sure which boiler size is best for your home, get in touch with us.

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Unit 2, Easter Park
Worcester Road
Kidderminster
DY11 7AR
T 01527 888000

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