Boiler Replacement

Small Combi Boilers

To keep your energy bills as low as possible, you need a boiler that will generate the necessary amount of power to provide you with the heating and hot water that you need. A boiler that is too powerful for your needs means you could be paying more than you need to.

Small combi boilers are great for smaller homes who do not have space for a water tank and don’t have a high demand for hot water.

They are still powerful enough to supply a small home or apartment without any problems at all.

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What is a combi boiler?

A combi boiler is one of the most common boilers in the UK. This is because they combine both a hot water and heating system in one unit making them convenient and efficient.

There is no need for a hot water tank as the water is heated via the mains so hot water is delivered on-demand.

The main benefits of a combi boiler system are:

  • They are great for smaller homes as no water tank is required;
  • Hot water is delivered quickly;
  • Water pressure is generally good;
  • They are very efficient;
  • You will not run out of how water and you do not have to wait for a tank to refill.

What is a small combination boiler?

Although combi boilers are generally compact, when referring to the size of a boiler this equates to the power output of the unit. A small combi-boiler is anything that is labelled 25kW or under.

A small combi boiler will work best in small houses, flats, and apartments and the number of radiators you have in your property will also determine which boiler is appropriate for your home.

Before deciding, think about the heating and hot water demands of your home and lifestyle, to ensure you get the boiler that is right for you.

What are the benefits of a small combi boiler?

Choosing the correct size boiler for your home is essential to ensure maximum efficiency and to help you save money on your energy bills. If you have decided that a small combi boiler is the best option for your property, here are some of the main benefits:

  • They are perfect for smaller properties
  • Your energy bills will be streamlined
  • Replacing an old, inefficient boiler is more cost-effective
  • They are very efficient and better for the environment
  • They are easy to install and can fit into compact spaces

When is a small combi boiler not suitable?

A small combi boiler may not be suitable if you have a medium or large-sized home. If you have a home with 4 or more bedrooms and more than 1 bathroom, your home is considered to be large.

A large home will have a higher demand for hot water, so a more powerful boiler is needed. Generally, a 35 kW output would be suitable for a home of this size. Similarly, if you have a 3 bedroom home but more than 3 occupants, a small combi boiler may not be powerful enough.

The number of radiators you have will also affect the kW output you need from a boiler.

Use the table below as a general guide to help you choose the right boiler.

  • Up to 10 radiators: 24-27 kW (Small boiler)
  • 10-15 radiators: 28-34 kW (Medium boiler)
  • 15-20 radiators: 35-42 kW (Larger boiler)

Examples of small combi boilers

The cost of your boiler will depend on the brand, the size, and the installer you choose. Here are some examples of small combi boilers from a range of manufacturers. These prices are subject to change and do not include installation.

Vaillant ecoTEC Plus 24 kW

Valliant is an international brand with over 140 years’ experience in the heating industry. They are a well-known manufacturer and are leading the way in renewable technologies and utilising sustainable sources of energy.

This 24 kW boiler costs around £1,000 and has 94% efficiency. It is compact and easy to install and access.

It is ultra-quiet and has two-stage frost protection to ensure maximum efficiency all year round.

Vaillant ecoTec Plus 24 kW

Baxi EcoBlue Advance 24 kW

Baxi is known for its highly efficient boilers and high-quality parts. This model is A-rated and is 93% efficient. The small dimensions mean it can be fitted in a space as small as a kitchen cupboard and it comes with a choice of flue lengths to suit most properties.

The EcoBlue Advance 24 kW costs around £1,250 and also comes with an exceptional 10-year warranty for added peace of mind.

Baxi EcoBlue Advance 24 kW

Daikin D2CND 24kW

Daikin has been producing highly reliable boilers for over 90 years. The D2CND 24kW model is A-rated and comes with a 2-year warranty. It is highly efficient and has an average price of £875.

It claims to be the world’s smallest combi so is perfect for homes that don’t have an excessive need for hot water. Maintenance is easy as all components are readily accessible.

Daikin D2CND 24kW

Get quotes from boiler installers

You will need to choose a professional installer to fit your small combi boiler. You may also want to discuss your options with them and take their advice.

You can use Warmerinside’s free quotation service, where you can compare costs and choose the best boiler installer for you.

Get in touch with local companies today, who will give you a quote to install your small combi boiler safely.