Which type of boiler do I need

April 12, 2023 | News

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The Ultimate Guide to Choosing the Perfect Boiler for Your Home

Making the right choice for your home’s boiler is a critical decision that can have long-lasting effects on your energy consumption and bills. To help you make an informed decision, we have compiled a comprehensive guide that covers the types of boilers, factors to consider, and recommendations based on various property sizes. In this guide, we’ll help you answer the question, “which type of boiler do I need?”

Understanding the Different Types of Boilers

Before diving into the details of selecting the right boiler for your home, it’s essential to understand the various types of boilers available in the market.

Conventional Boilers

Conventional boilers, also known as regular or heat-only boilers, heat water and store it in a hot water cylinder. These boilers are suitable for larger homes with multiple bathrooms and numerous radiators. However, the hot water storage tank can occupy a significant amount of space. If you’re wondering, “which type of boiler do I need?” and have a larger property, a conventional boiler might be the right choice.

Combination Boilers

Combination boilers, commonly referred to as combi boilers, are the UK’s most popular boiler choice. They provide hot water on demand directly from the mains without needing a storage tank. Combi boilers are ideal for properties with limited space since all components are housed within a single unit. If you have a smaller home and need to save space, this might be the answer to “which type of boiler do I need?”

System Boilers

System boilers directly supply hot water to a storage cylinder and the radiators in your home. Like combi boilers, the main components are housed in one unit, simplifying installation and maintenance. These boilers are ideal for properties with multiple bathrooms or those requiring more hot water than a combi boiler can provide. If your hot water needs are greater than a combi boiler can handle, a system boiler might be the solution to “which type of boiler do I need?”

Factors to Consider When Choosing a Boiler

Once you’re familiar with the different types of boilers, consider the following factors to help you make the right choice:

Available Space

The space available in your home may dictate the type of boiler you can install. Smaller properties with limited storage space may benefit from a combi boiler, while larger properties might prefer a conventional or system boiler.

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Existing System

Evaluate your current heating system and consider whether you want to maintain the same setup. While it’s usually more cost-effective and practical to retain the existing system, older homes may benefit from switching to a more efficient boiler type.

Hot Water Demand

Determine your household’s hot water usage. If multiple outlets require hot water simultaneously, a system or conventional boiler with a hot water cylinder may be more suitable.

Selecting the Right Boiler Size

Choosing the correct boiler size for your home is crucial for ensuring it meets your heating and hot water needs. Factors influencing the right boiler size include hot water demand, property size, and heat loss.

Hot Water Demand

For most households with a single bath and shower, a 24-30 kW boiler is generally recommended. For properties with an additional en-suite bathroom, consider a 30-35 kW boiler. Homes with multiple bathrooms in use simultaneously may benefit from a system boiler.

Size of Property

The boiler size should correspond to your property size, as it directly affects the heat output needed to warm your home. Domestic boiler sizes typically range from 5 to 35 kW.

Heat Loss

It’s essential to account for heat loss when selecting a boiler size. An expert can calculate the heat loss on the coldest day of the year and determine the optimal boiler size for your home.

Choosing the Right Fuel Type

Consider the fuel type for your boiler based on availability and your property’s location.

Mains Gas

Mains gas is the most common fuel type in the UK and is considered the cleanest non-renewable energy source. If your home is connected to the gas network, this may be the most convenient and cost-effective option for you.


Oil boilers are an alternative for properties not connected to the gas network. They tend to be non-condensing, floor-standing, and may require more space. If you live in a rural area without access to mains gas, an oil boiler may be the answer to “which type of boiler do I need?”

Biomass and Alternative Energy

Biomass boilers and other alternative energy sources are increasingly popular choices for homeowners who want to reduce their environmental impact. By using sustainable fuel sources such as wood pellets, chips or logs, these systems can help lower your carbon footprint and save on energy bills. If you’re looking for a more eco-friendly heating solution, a biomass boiler could be the answer to “which type of boiler do I need?”

Air Source Heat Pumps

Air source heat pumps are another eco-friendly option for homeowners. These systems absorb heat from the outside air to heat your home and provide hot water. They can even work efficiently in cold temperatures, making them a viable choice for the UK climate. Air source heat pumps can be integrated with your existing heating system or installed as part of a new build. If you’re interested in a renewable energy solution, this could be the answer to “which type of boiler do I need?”

Ground Source Heat Pumps

Ground source heat pumps utilise heat from the ground to provide heating and hot water for your home. They work by extracting heat from the ground through a network of pipes buried in your garden. Like air source heat pumps, they can be integrated with your existing heating system or installed in a new build. If you have the space and budget for a ground source heat pump, it may be the solution to “which type of boiler do I need?”

Fuel Cell Technology

Fuel cell technology is an innovative and increasingly popular alternative energy source for heating and hot water. Fuel cells generate electricity through a chemical reaction, with the only by-products being water and heat. This makes them an environmentally-friendly option for homeowners looking to reduce their carbon footprint. If you’re interested in cutting-edge technology and sustainable energy, a fuel cell system might be the answer to “which type of boiler do I need?”

How to Choose the Right Boiler for Your Home

When it comes to selecting the perfect boiler for your home, there are several factors to consider. Here are some key points to help you make an informed decision:

  1. Property size: Consider the size of your property and the number of radiators and bathrooms you have. This will help you determine the required heat output and hot water demand for your home.
  2. Available space: If you have limited space, a combi boiler may be the best option, as it doesn’t require a separate hot water cylinder or storage tank.
  3. Existing system: If you’re replacing an old boiler, it’s often more cost-effective to stick with the same type of system. However, if you’re looking to improve efficiency or switch to a more eco-friendly option, it may be worth considering an alternative.
  4. Hot water usage: Assess your household’s hot water usage to determine the best type of boiler for your needs. If you have multiple bathrooms or require hot water from multiple outlets simultaneously, a system or conventional boiler may be more suitable.
  5. Fuel type: Consider the fuel type available to you – mains gas, oil, or alternative energy sources. This will influence the type of boiler you can install.
  6. Energy efficiency: Energy-efficient boilers can save you money on your energy bills and reduce your carbon footprint. Look for boilers with high efficiency ratings (A-rated) and low emissions.

Consult a Professional

Ultimately, it’s essential to consult a qualified heating engineer to assess your home’s heating and hot water requirements. They can advise on the best type and size of boiler for your property, ensuring optimal efficiency and performance.

By considering all these factors and seeking professional guidance, you can confidently answer the question, “which type of boiler do I need?” and choose the right boiler for your home, ensuring comfort, efficiency, and long-term savings.


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