Homeowners Professionals

Gas System Boilers

Providing hot water on demand to multiple taps and showers.

Providing hot water on demand to multiple taps and showers

If you have more than one bathroom in your home or you have a high demand for hot water, our range of gas system boilers could be the ideal choice for your property. System boilers are able to provide high pressure hot water on demand to multiple taps or showers at the same time with an almost instant response.

How do system boilers work?

System boilers provide hot water directly to your central heating system and they produce hot water for a sealed storage cylinder within your home. Like a conventional boiler, they store hot water. However, unlike a conventional boiler, they take their water directly from the mains rather than from a tank in the loft. This means they take up less space.

All heating and hot water components in our system boilers are contained within one compact arrangement. The only external part of the system is the cylinder that stores the hot water. This makes the systems tidier and it also means that installation and servicing is easier and more efficient.

Because they feature a storage tank, system boilers give you a greater hot water capacity than combi boilers. They allow you to use multiple taps or showers at the same time without experiencing a reduction in pressure. This means the appliances are ideal for large or busy households with more than one bathroom. Another feature of system boilers is that they provide water at higher pressure than conventional boilers.

System boilers are extremely efficient to run as well, and they are compatible with solar water heating systems. 

Benefits of a Viessmann combi boiler

When you choose a Viessmann gas condensing combi boiler, you can rest assured you’re getting the highest standards of performance. Our models are exceptionally reliable and they are built to last. They are also highly efficient, converting up to 98 per cent of the natural gas they use into heat. This will help you to lower your energy bills and cut your carbon footprint.

Our gas combi boilers have also been created with smart technology in mind, allowing you to control them from wherever you happen to be.


Our range of gas condensing combi boilers also bring a range of other benefits. For example: 

Our range of system boilers

When you choose a Viessmann system boiler, you can be sure you’re benefiting from the very best in engineering and design. Our comprehensive range of models is built around our long-established reputation for creating high quality heating systems.

Utilising the latest heating technology, the Viessmann system boiler range defines the quality benchmark for other brands. With all of our boilers, we are focused on using energy efficiently, cutting costs, saving natural resources and protecting the environment. Each of our system boilers is rated class A for energy efficiency, and they are compatible with Viessmann solar thermal systems and other low carbon and renewable technologies. This gives you the opportunity to further lower your bills and reduce your carbon footprint.

Take your pick from models including our Vitodens 100-W, which is popular for smaller homes, and our Vitodens 200-W, which is designed for use in larger detached and semi-detached properties. Whichever model you go for, you’ll benefit from features such as a user-friendly touchscreen display and an optional tado° thermostat and smartphone app which allows you to control your heating system with ease no matter where you are.

All of our boilers are built to last and they come with features such as corrosion-resistant stainless steel Inox-Radial heat exchangers.

Benefits of a Viessmann system boiler

Ideal for delivering hot water to more than one bathroom in a property
Hot water is constantly supplied to any number of taps, baths or showers simultaneously
Space-saving, as there is no need for a feed or expansion cistern
Compatible with Viessmann solar thermal systems and other renewables and low carbon technologies
Comprehensive warranty on the entire range, as standard
Installed together with a Vitocell 200 or 300 unvented cylinder they are the perfect combination to meet G3 building regulation (heating and hot water)
Reduced costs of extra components needed on 2-pipe system boilers
Reduced running costs from weather compensation in heating mode
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