For support call: 0330 100 3143
Find an Installer

System Boilers from Vaillant

Choose the right system boiler for your home

System boilers, also known as sealed system boilers, are the perfect solution for larger family homes where you might have many people using multiple sources of hot water at the same time. System boilers store a large reservoir of hot water, at temperature, in a hot water cylinder so you have a constant supply of hot water around the clock.

With a system boiler everything you need for your heating and hot water systems is built into this compact yet powerful and highly efficient package. In addition to this, most of our boilers are Quiet Mark accredited meaning that those peaceful nights will never be interrupted by the sound of a Vaillant boiler.

Learn more about the Vaillant system boiler range below, or learn more about our range of gas boilers including combi boilers and conventional boilers.

1 - 5 of 5 Results


ecoTEC plus system boiler

Introducing the new Smart Home Ready and hydrogen prepared* ecoTEC plus

  • Precise heating control and energy optimisation using our myVAILLANT app
  • Apple Homekit and Amazon Alexa integration for even more convenience
  • New built-in IoniDetect technology provides even greater efficiency, lower gas consumption and less wear and tear

ecoTEC exclusive with Green iQ system

The premium system boiler

  • The best in boiler performance, control and efficiency
  • Fully compatible with our vSMART™ heating control for optimum performance and smartphone app control
  • Eco-friendly and 85% recyclable

ecoTEC plus system (discontinued)

The flexible system boiler for any home

  • High performance, control and efficiency
  • Precision heating to reduce your fuel bills
  • Hand-built in our award-winning Derbyshire manufacturing plant

ecoTEC plus 48 and 64kW

High output wall-hung boiler range

  • Compact design for large domestic properties
  • Suitable for natural gas and LPG applications
  • High efficiency enables lower running costs

ecoFIT pure system

The cupboard-size system boiler for any home

  • High performance build, smart controls and efficiency
  • Compact enough to fit in a kitchen cupboard
  • Hand-built in our award-winning Derbyshire manufacturing plant

1 - 5 of 5 Results

How does a system boiler work?

Unlike combi boilers, system boilers are not connected to the cold mains. A coil in the cylinder carries the central heating water at high temperature through the cylinder, heating it's contents.

The hot water cylinder stores a large reservoir of hot water at all times so a steady supply of hot water can be delivered across your home, even when multiple taps and showers are in use.

What are the benefits of a system boiler?

System boilers are a popular choice for larger households in the UK due to their compact yet powerful nature, economical running costs, and efficient delivery of heating and hot water.

Whilst we’ve designed all of our boilers to be as sleek and aesthetically pleasing as possible, products such as our ecoFIT pure system have been created to have a small footprint without compromising on performance or power. The ecoFIT pure is so compact that it will fit inside a standard cupboard; perfect for homeowners who don’t want their boilers to be seen or heard.

Unlike conventional boilers, a system boiler doesn’t require a cold water storage tank, so it needs considerably less space to be installed. They do, however, require a hot water cylinder. The hot water cylinder means that you’ll have access to a constant stream of hot water, even when multiple people are using it. This comes as music to the ears of those who live in a household with multiple bathrooms and don’t enjoy their showers being cut short due to lack of supply. Finally, our range of system boilers are incredibly efficient to run; contributing towards lower energy consumption and lower bills.

How much does a system boiler cost?

System boilers can cost between £500 and £2000 for the boiler itself.

Keep in mind that installation will be on top of this, along with any further materials required such as pipework and your hot water cylinder. We recommend gathering three quotes during your research. This provides you with enough information to make an informed decision, but not so much that you become overwhelmed.

There are significant benefits to booking a Vaillant Advance Installer; not only do they know the products inside out, but using an accredited installer also extends your guarantee up to ten years!

Learn more about system boilers

When it comes to boilers, we’re the experts but this is your home. This is why we’ve asked our experts to share their knowledge with you to help you make the right decision for you, your home, and your family.

System boilers if you're looking for further information, like the difference between a system and a combi boiler and much more.

If you're wondering what size boiler do you need for your home, we'll help you understand how the different types of gas boilers work, and what the right choice is for you. Read our guide here

Articles you may be interested in