Combi Boiler Installation – Designer Tips for Optimal Placement

a white laundry room with large cupboards

Your combi boiler, the heart of your home’s heating and hot water system, deserves a comfy spot to reside. Yet even if you have the best combi boiler, you won’t enjoy it to the fullest if it’s an eye sore or disrupts the aesthetic harmony of your living spaces.

In this guide, we’ll navigate various locations around the house, offering insights and tips to help you find the ideal spot for your combi boiler installation. We’ll also delve into situations where specific options might not be the best fit for your home’s layout or lifestyle.

Combi Boiler Installation

Before delving into the tips, it’s crucial to understand what a combi boiler is and how it functions.

Combi boilers are space-saving units that heat water directly from the mains whenever you turn on a hot tap, meaning there’s no need for a hot water storage cylinder or a cold water tank in the loft. This makes them ideal for homes with limited space.

When deciding where to install your combi boiler, consider the following factors:

  • Accessibility: For maintenance and repairs, ensure the boiler is easily accessible. It shouldn’t be hidden away in a spot that’s hard to reach.
  • Ventilation: Boilers need a good supply of air to operate efficiently. The chosen location should have adequate ventilation to prevent overheating and ensure safety.
  • Noise: Although modern combi boilers are relatively quiet, they do make some noise when in operation. Avoid placing them near bedrooms or living spaces where noise could be an issue.
  • Aesthetics: Boilers aren’t typically designed to be focal points in a room. Consider ways to conceal or integrate the boiler into your home’s design without compromising accessibility or ventilation.
  • Building Regulations: Ensure your chosen location complies with local building codes and regulations, including clearance distances from windows and doors.

Where Do I Place My Boiler?

As a kid, when I visited my grandparents, I would always marvel at why they had their boiler in their bedroom. It looked rather out of place: like a metal birdfeeder on lovely Victorian patterned walls. 

Later on, it turned out that my grandma and grandpa would constantly fight over the temperature at home: my grandma was always cold and my grandpa always felt parched. Therefore, to find the most optimal temperature during nighttime and avoid running back and forth, they decided to keep their boiler by their bedside!

However now, when boilers can be controlled from our phones, locating the boiler is possible anywhere we prefer. Let’s take a look at some common ways to place a combi boiler. 

Kitchen Integration

a sage green kitchen with persian rug on the floor and oak flooring
Create extra cupboards in your kitchen to hide a boiler

Consider integrating the combi boiler into your kitchen. It’s convenient for hot water access, and with clever cabinetry design, you can maintain a sleek look.

Despite its utilitarian purpose, the boiler can be seamlessly integrated into the kitchen’s décor. Custom cabinetry or built-in enclosures can effectively conceal the boiler, creating a clean and uncluttered look.

Opt for cabinetry that complements the existing kitchen style, whether it’s a modern, sleek aesthetic or a classic, traditional feel. Ensure proper ventilation, and if space allows, position it near the sink for efficiency.

Utility Room Utilization

hiding a combi boiler in a utility room

The utility room is a natural fit for a combi boiler. Find a dedicated space, keeping in mind ventilation requirements. This location ensures easy access for maintenance while minimizing its visual impact on the overall design.

Moreover, the utility room placement simplifies maintenance access for technicians. This allows for regular servicing and repairs without disrupting the main living areas.

The utility room often serves as a catch-all for various household items. By incorporating the boiler into this space, you can optimize the use of available space while maintaining functionality and aesthetics.

If your utility room houses other appliances, such as washing machines or dryers, consider positioning the boiler near or adjacent to these appliances to minimize pipe runs and reduce the risk of hot water leaks.

Under-Stair Storage

Since the under-stair area often goes unused, utilize this space for a discreet combi boiler placement. Design custom cabinets for a seamless look. However, be cautious with smaller spaces, as proper ventilation is crucial, and accessibility might be limited.

If the under-stairs area is particularly cramped, consider opting for a smaller combi boiler model. Smaller boilers are designed to be more compact and efficient, making them better suited for limited spaces.

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Bathroom Concealment

Integrate the combi boiler into a bathroom cupboard, especially in larger bathrooms. Ensure excellent ventilation and consider its impact on the room’s aesthetic.

However, avoid this option in smaller bathrooms where space constraints and moisture issues may arise.


For homeowners with a garage, placing the combi boiler in this space can be practical. Incorporate shelving or built-in cabinets for organization. Be cautious in colder climates, as the garage may not be an ideal location due to potential freezing.

However, the garage placement might pose limited accessibility for maintenance access. Regular servicing and repairs require technicians to enter the garage, which could be inconvenient or impractical.

Cloakroom Conversions

Converting a small cloakroom or cupboard into a boiler room is an efficient use of space. This can be particularly effective in smaller homes where space is at a premium.

Ensure the room is well-ventilated and that the boiler is easily accessible for servicing.

Integrated Furniture Design

a blue kitchen with white marble worktops
A boiler can easily be hidden in custom-built cabinetry

In modern designs, integrate the combi boiler within custom-built furniture for a contemporary look. This is ideal for larger living spaces but may not suit smaller rooms, as the furniture might dominate the space.

However, always strive to reach a balance between sleek design and safety. Remember that some boiler scenarios are highly recommended to avoid:

  • Limited ventilation space: If a chosen space lacks proper ventilation, it’s not suitable for a combi boiler. Inadequate airflow can lead to overheating and reduce the boiler’s efficiency.
  • High moisture areas: Placing a combi boiler in a high-moisture environment, such as directly within a bathroom without proper ventilation, can lead to maintenance issues and potential damage.
  • Freezing temperatures in the garage: While a garage may seem like a suitable location, in extremely cold climates, the risk of freezing pipes may make this option less practical.
  • Limited accessibility for maintenance: Avoid locations that hinder easy access for maintenance. A hidden spot that becomes difficult to reach can result in challenges when repairs or servicing are required.

All in all, selecting the right spot for your combi boiler involves a delicate balance between practicality and design aesthetics.

Consider the specific needs of your home and potential challenges in each location to make an informed decision that not only optimizes the boiler’s functionality but also enhances the overall design of your living spaces.

Always prioritize ventilation, accessibility, and the unique characteristics of each room when deciding on the perfect placement for your combi boiler.

Disclosure: Some of the links above are affiliate links, meaning that at no additional cost to you, I will receive a very small commission if you click through and make a purchase. These links help to pay the editorial costs of writing a blog. For more information, please read my full affiliate disclosure here

I also use Artificial Intelligence Image generators to create some of my images. These are to show you examples of my ideas and inspiration when I cannot produce the real images myself.

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