Vokèra Unica i28

Type Combi boiler
Fuel Gas
Efficiency Rating A
Standard Warranty 7 years***
Weight 40kg
Width x Height x Depth 400mm x 780mm x 358mm
Max kW Output 28kw
Flow rate 11.5l/min


The Unica i28 is a condensing combi boiler that is designed to provide excellent energy-efficiency under a typically lengthy manufacturer’s warranty***. Manufactured to be compact in size, it could be an ideal choice for smaller homes that are tight on space.

Typically set up to serve homes with 2 or 3 bedrooms and one bathroom, the Unica i28 is a modern unit that is designed to deliver the central heating you need and manufactured to help lower energy wastage by reducing its own power output when appropriate.

Product description

As an A rated boiler with an efficiency rating of 98 per cent, the Unica i28 could be a suitable unit to power the central heating in a small to medium sized home with low to average hot-water requirements.

It has intuitive controls that make it easy to manage your hot-water supply and heating around the house, so you may be able to minimise energy wastage. The modulation ratio of the Unica i28 is a class-leading 10:1, which means that it could reduce its own power down to just 10%of its full capacity. Doing so when it identifies that your home doesn’t need as much heat could potentially help you reduce energy wastage and lower your energy bills**.

The unit is also manufactured to be easy to maintain thanks to the front-mounted heat exchanger; such features are designed to make the Unica 28i an ideal heating solution for the modern home.


Reviews and accolades

The Vokera Unica i28 has received a number of reviews and ratings. These include:

  • 5 stars for energy-efficiency rating
  • 3 star brand customer score
  • 3 stars for ease of repair
  • 3 stars for ease of service
  • 3 stars for availability of parts and spares


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Similar Alternative Models

If you are comparing your choices, take a look through some of our alternative options to the Unica i28 to get the most out of your central heating system:

1. Worcester Bosch Greenstar 30i

  • Typically suitable for medium-sized homes with an average demand for hot water, the Greenstar 30i has a lower flow rate of 10.8 litres per minute
  • Efficiency rating: A
  • Up to 10-years' manufacturer-backed warranty through HomeServe***

2. Worcester Bosch Greenstar 25i

  • Maximum power output of 25kW makes it suitable for smaller homes with a lower demand for hot water
  • Smaller unit with a height of just 710mm
  • Lower flow rate of 9 litres per minute

3. Vokèra Unica i32

  • A typically suitable choice for houses with 3-4 bedrooms, approximately 15 radiators and an average demand for hot-water
  • Energy Saving trust endorsed
  • Large digital display

You can get a free online quote for the installation of a new boiler with us today.


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**Source: energysavingtrust.org.uk. Saving calculated when replacing G-rated with A-rated boiler in a semi-detached house.

***Subject to an annual service at the customer's expense. Warranty extension from 5-years to 10-years only available on Worcester Bosch and Ideal gas boilers.