Worcester Bosch Combi boilers - Everything you need to know

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Discover the award winning range of Worcester Bosch combi boilers.

Worcester boilers boilers come in different sizes both physically and hot water power, so you can be sure that there is a boiler to fit your needs. In this article, we'll explain which combi boilers are available and the key facts to help you understand which boiler is right for you.

Average Combi boiler sizes need for your home.

Size / Type
of house
Number of
bedrooms
Number of
radiators
Boiler
Size
Small terrace,
flat or bungalow
1-2 Up to 10 24-27kW
Semi-detacted house,
Medium Tarrace or
bungalow
3-4 Up to 15 28-34kW
Large semi-detacted
or detached house
4+ Up to 20 35-42kW

Worcester Bosch Greenstar range of combi boilers

Greenstar i (25i, 30i)

The Greenstar i is perfect for small to medium sized homes with one bathroom. This model replaced a well-established award-winning boiler that has been installed in over 1 million homes across the UK. The latest model now has a user friendly control that allows you to adjust your heating and hot water to meet your exact requirements.

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Some key characteristics of this boiler are:

  • Zero risk of condensate pipe freezing in severe weather
  • Wide choice of controls enables greater comfort and economy
  • Low energy pump reduces electrical usage
  • Central heating output (kW) 24
  • 10.2 litres or 12.3 litres of hot water per minute

Dimensions:
Height: 710mm
Depth: 330mm max
Width: 400mm

Energy rating:
Class A - 94%


Greenstar Si Compact (25Si, 30Si)

This boiler will fit perfectly in a kitchen cupboard and has an easy to use timer with simple controls that allow you to fine tune your temperatures.

Some key characteristics of this boiler are:

  • A wide choice of controls enable greater comfort and economy
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Low energy pump reduces electrical usage
  • 10.2 or 12.3 litres of hot water per minute
  • Central heating output (kW) 24

Dimensions:
Height: 690mm
Depth: 280mm
Width: 390mm

Energy rating:
Class A - 94%


Greenstar CDi Classic (29CDI, 34CDI, 38CDI, 42CDI) overview

The Greenstar CDi Classic boiler is a top of the range combi boiler offering the highest levels of hot water comfort.

This boiler is known for its efficiency and reliability.

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Some key characteristics of this boiler are:

  • Highest hot water flow rate of the Greenstar combi wall mounted range, for example, 12.3, 14.3, 16.4, 17.2 litres per minute (in order above).
  • Low energy pump reduces electrical usage
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Wide choice of controls enables greater comfort and economy

Dimensions:
Height 760mm
Depth 360mm
Width 440mm

Energy rating:
Class A - 92%

Greenstar CDi Compact (28CDi, 32CDi, 36CDi) overview
This boiler is designed to fit within a standard kitchen cupboard. Despite its compact size, the high outputs make it suitable for homes with more than one bathroom.

Some key characteristics of this boiler are:

  • User-friendly displays for ease of use
  • Hot water can be adjusted to fine tune your comfort
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Wide choice of controls enables greater comfort and economy
  • Low energy pump reduces electrical usage

Dimensions:
Height 690mm
Depth 280mm
Width 390mm

Energy rating: Class A - 94%

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Greenstar Highflow CDi (440CDi, 550CDi) overview

The Greenstar Highflow CDi is a well-established floor standing combi boiler that is renowned for industry-leading hot water flow rates.

Some key characteristics of this boiler are:

  • Fits underneath a standard kitchen worktop
  • Wide choice of controls enables greater comfort economy
  • Frost protection is included, reducing frost risk if installed in a garage or a cellar
  • Simple boiler control knobs with temperature display
  • Instantaneous hot water, always available
  • Central heating output (kW) 29 & 30

Dimensions:
Height 850mm
Depth 600mm
Width 600mm

Energy rating:
Class A - 92%

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