How to Find the Right Type and Size of Boiler

water boiler

Written by Adrian

Hot water and heating are essential in everyday life, which is why a boiler is a vital part of any property today. Without heat, you will be left cold and miserable. If you need a boiler, how do you know what to choose exactly? You see, there are various types and sizes of boilers, and you need to select the right one that is suited best to the type of property that you have. How? 

It all starts with knowing the type of boiler that you need.

The Types of Boiler

It’s important to note that there is a wide range of boiler types to choose from. Here are your options: 

  • Conventional – Also referred to as “standard” or “traditional” boiler, it uses hot and cold water storage tanks to heat water. This type of boiler runs on fuel, and it travels to your taps. 
  • Combi – A popular boiler choice, combination boilers heat hot water only when you need it. It will not store hot water, which is why many property owners prefer it because they get to save more money on electricity bills. It is called a combi boiler because it also provides central heating. The downside to this is that it can only deliver water one outlet at a time, which means you either have to use it for heating or hot water, but not at the same time. 
  • System – It is ideal for bigger properties, such as commercial ones that require large quantities of water. A system boiler takes water directly from the main supply and heats it in a storage cylinder. It doesn’t need a cold water tank. With a system boiler, you will always have access to instant hot water. 

The Boiler Size

The boiler size is known as an output that is measured in kilowatts (kW). Generally, the higher number of kW, the more powerful the boiler will be. For residential boilers, the size ranges between 24kW and 42kW. 

Finding the right size of boiler is essential because if it’s too big, it means it will generate more power, therefore more fuel consumption. On the other hand, a too-small boiler may not be able to meet your heating needs at home. 

To determine the boiler size suited to your property, here are the factors to consider: 

  • Property size – This is pretty straightforward. If you have a big property, then you need a more powerful boiler that is bigger in size. 
  • Number of radiators – The number of radiators in the property will determine the amount of water to keep them warm. 
  • Number of bathrooms – Consider the number of bathrooms in the property and the frequency of use of baths and showers. 
  • Boiler usage – If there’s a lot of people in the property, the demand for hot water and heating is high. 
  • Number of floors – If the property is spread out over several different levels, you need a powerful boiler to ensure the water pressure is maintained throughout all the floors. 


Choosing a boiler may be tedious for first-timers. These tips will help you find the right type and size of boiler that will work best for your property and budget. 

Adrian Plumbing and Heating can help you with boiler installation and other services. Our experts can also help you choose the right boiler for your needs. Contact us today!

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