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Vokera evolve S Boiler

Natural gas and LPG compatible out of the box, the Vokera evolve S is a high-efficiency system boiler with space-saving dimensions.

The Vokera evolve S wall-mountable gas condensing system boiler is for central heating only and can provide hot water when installed with a separate cylinder, which is usually located in an airing cupboard near a bathroom. It offers best in class performance, can run on natural gas or LPG, and comes in a range of outputs to suit your heating and hot water requirements.

How Much Does this Boiler Cost?

Vokera’s evolve S is available in four outputs, including 18kW, 24kW, 30kW and 35kW. It’s an affordable system boiler that will set you back anything between £900 and £1,060, depending on the size you require. You also need to pay for the boiler to be installed by a Gas Safe registered engineer, and installation costs vary based on who you hire and the amount of work involved. Getting a fixed-price quote from local and national installers should help you find the best price. 

How will I know if this Boiler is Suitable for My Home?

System boilers, like the Vokera evolve S, take water directly from the mains and require a separate cylinder for storing hot water. That means they need a bit more space than combi boilers but less space than regular boilers. The evolve S from Vokera is ideal for homes with limited loft space and a high demand for hot water. 

You must pick a boiler that can meet the heating and hot water demands within your home, so we recommend you contact a Gas Safe registered engineer who can help you select the correct boiler type and size for your needs. 

Is it a High Efficiency Boiler?

Yes. The Vokera evolve S is A-rated and has an ErP space heating efficiency of 94%, making it one of the top-performing system boilers on the market. It’s fully compliant with the Energy-related Products Directive and can achieve further efficiency when installed with an OpenTherm control or a weather compensation sensor. 

Does this Boiler have a Good Range of Controls and Features?

This system boiler from Vokera has a liquid crystal display user interface, text menu and a set of controls that let you view, change and adjust the operating modes with ease. It comes complete with a built-in carbon monoxide monitor, ACC (active combustion control) to reduce emissions and frost protection to protect the unit from damage during the winter. The evolve S also has an anti-seize function, self-start programming and an enhanced auto-stop disabling function with four optional modes of operation. 

How long is the Warranty on this Boiler?

The Vokera evolve S System boiler comes with a 10-year warranty as standard to give you peace of mind that you’re covered should something go wrong with your appliance. 

Summary of Important Information

  • Expect to pay between £900 and £1,060
  • Heating output of 18kW, 24kW, 30kW or 35kW
  • 18kW and 24kW unit dimensions: 740mm (H) x 420mm (W) x 275mm (D)
  • 30kW and 35kW unit dimensions: 740mm (H) x 420mm (W) x 350mm (D)
  • Uses natural gas or LPG as its fuel source
  • A-rated for efficiency
  • 10-year warranty as standard

Pros and Cons

Vokera’s evolve S System certainly seems to have everything you could want from a reliable and efficient boiler, plus it comes with a generous warranty. It’s worth pointing out that the 18kW and 24kW models can be sited almost anywhere in your home, including within a kitchen cupboard. Check out our list of pros and cons below to help you decide whether this system boiler is a contender for your home.  


  • Considerably cheaper than some other boiler brands
  • Suited to small, medium and large-sized homes 
  • Easy to install, use and service
  • High modulation ratio of 1:7 – maximises efficiency and user comfort
  • Built-in carbon monoxide monitor – enhances safety
  • Text driven menu – easy setup and adjustment
  • Built-in frost protection
  • Anti-seize function – protects the pump and motorised valve from sticking
  • OpenTherm inside
  • Versatile flue options
  • Excellent rating on Trustpilot – correct at the time of writing – January 2022
  • 10-year warranty


  • Requires separate cylinder
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