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A system boiler works together with a hot water cylinder to provide central heating and hot water to our homes. The boiler heats water directly from the mains to warm up our radiators, and fills the cylinder with boiling water that’s used for our sinks, showers and more.


Due to the use of condensing technology, system boilers are very efficient. They can achieve up to 90% efficiency in ideal conditions. Taps and showers receive immediate hot water at the same pressure. As a result, they can also improve water consumption in your home.

This factor is determined by the capacity of your hot water cylinder. You should consider how much water you need for taps, baths and showers when choosing the right size. However, you should keep in mind that the size of your cylinder will rely on the space available. A system engineer will help you design the hot water tank and the system to your ultimate satisfaction and your hot water demand. If calculated correctly, you wouldn’t run out of hot water.


Hot water isn’t always instant in busier times

Once you use all the stored hot water in your cylinder, you have to wait for some time to be able to use hot water again. Always buy a cylinder with the capacity to meet your hot water demands and needs.

Needs lots of space

Regular boilers need space for the water tank and the hot water cylinder. That’s why it’s not a good choice for smaller homes that don’t have much space. For smaller homes, a combi boiler is more suitable.

Installation can be costly

Because there are many parts to be installed around the house, a new boiler installation can be pricy. Aside from being expensive it can also take a lot of time.

To get what you exactly need, you should take a look at the pros and cons of regular boilers. There are a lot of things to think of when it comes to choosing the most suitable boiler for you.

It is all pretty simple. Basically, a regular boiler will take water from the tank to provide heating. It is important to place your tank as high as possible to have a better water flow in all the system.

A heat exchanger warms up the cold water once you turn on the hot tap or switch on the heating. After that the hot water moves to the hot water storage cylinder where it is kept and circulated. Then valves will direct hot water to the heating system or the taps and outlets.

Cold water runs through the combi boilers directly from the main water source. In order to produce heat, the gas fuel is burned. The heat is then transformed from the combustion chamber to the water through a heat exchanger.

Your thermostat would know when the temperatures drop in your house. Subsequently, it will send a signal to the combi boiler which would fire up and heat your home.

The minute the required heat is reached, your combi boiler would decrease the produced heat and keep the status quo. As a result, it will reduce your energy waste as well as keep your house warm.

A Combi boiler directs hot water to any outlet you are using such as a hot tap, a shower or a bath. When you turn off the tap, the central heating duties will be back in action.

Keep in mind that your Combi boiler directs hot water to the water outlets or the central heating, but not both at the same time.

Combi Boilers take water directly from the mains water supply in your home. To provide an appropriate water flow, they rely on the pressure coming from the mains.

So if the pressure from the mains is not strong enough, a combi boiler is not, therefore, suitable for your home.

A combi Boiler comes with two outputs; one for how water and the other is for home heating. Hot water for central heating takes less effort than on-demand hot water. That’s why it’s crucial to choose a boiler that corresponds with your hot water demands.

Another key point is that if you live in large home with many bathrooms, then a system boiler is what you need.

When we talk about boiler size, we do not mean its dimensions, but rather its power output.

The unit of measurement, used for Combi Boilers, is the kilowatt (kW). To clarify, the bigger the kilowatts, the greater the capacity of the boiler to match your demands for hot water and central heating.

We advise that you get a small (low power) combi boiler if you have a small home with only one bathroom.

On the other hand, you will need a much bigger boiler if you live in larger property with more than one bathroom.

Here’s what you need to know about Minimum kW Size:

NO. OF BEDRROMS1 bath & shower2 baths & showers 
2-beedrom house26 kW29 kWGet Quotes
3-bedroom house29 KW35 kWGet Quotes
4-bedroom house29 KW35 KWGet Quotes
5-bedrrom house35 KW35 KWGet Quotes

When it comes to relying on a hot water storage cylinder, then both systems are very similar. Both of them keep a store of hot water ready for your use. However, the main difference is that a system boiler draws water directly from the mains. While, a regular boiler will take its water supply from a tank in the attic. In short, with the system boiler you do not need a cold water tank high up in the attic.

Firstly, a heat exchanger heats the water. Then it moves energy from the gas jets to the water. Once the water is heated, it is moved to the hot water cylinder where it will be stored. Even when you are using multiple taps and showers, a constant supply of hot water is always available.

There are many things to consider but one of the most crucial points is how much space do you need for a system boiler. In general, a system boiler is larger than a regular boiler so you need to make sure that you have sufficient space. What makes a system boiler bigger is the fact that it has a pump and an expansion tank. It’s worth mentioning that the additional parts would be covered by the manufacturer warranty. An airing cupboard is where the hot water cylinder most likely to be installed.

System boilers are perfect for homes with limited space because they do not need a header tank.


Without a doubt, you will get the same quality for your boiler as if you have paid for it in cash. This is something you shouldn’t worry about in the first place.

How you choose to pay for your new boiler has nothing to do with the quality of the service and the boiler.

Needless to say that you will receive the same warranty protection for the same period and quality regardless of the brand you go with. This includes the Alpha boiler, the Worcester Bosch boiler or the Viessmann boiler.

There are certain conditions that must be met before you apply for a loan with Duologi:

  1. Be 18 years or over at the date of the application. Back to contents
  2. Be no older than 75 years at the end of the loan term.
  3. Be a UK resident.
  4. Have 3 years of UK address history.
  5. Have an annual income of at least £10,000.
  6. Have a valid personal phone number and e-mail address.
  7. Have a good credit history with no late payments, county court judgements (CCJs), debt relief orders, individual voluntary arrangement (IVA) or bankruptcies.

Of course, it does. The cost of the installation can be included in your monthly plan.

In other words, you don’t have to worry about financing the installation cost. We will remove your old boiler, get you a new one and install it. And all the installation fees will be part of your monthly payment plan.

Having a bad credit history will not necessarily disqualify you from getting a finance plan. Pass rates for boilers on finance are high if you don’t have any recent CCJs or IVAs in the last 5 years.

Sub-prime lenders often help those with poor credit history. But they would charge a much higher APR % rate due to the risks involved.

*Offered subject to status and successful credit assessment. Terms and conditions apply.

What is a credit check?

• A credit search, otherwise known as a credit check, is when a company reviews your credit report.  This is to see how well you’ve managed money or credit in the past.

• A credit check shows details about your finances, such as your existing debts and credit available to you. It can also show any financial links you have with other people.

• A credit check will also show court records.  This can include bankruptcies, payment defaults, County Court Judgements (CCJs) and Individual Voluntary Arrangements (IVAs).

• Lenders use credit checks to help them decide whether to accept you for their credit products.


* information collected from our finance provider Duologi.

Still got a question?

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