Worcester Bosch Greenstar i System Boiler

The Worcester Bosch Greenstar i Gas System Boiler is a model from the company’s Greenstar range. It is a little different though – as a system boiler it works like a regular conventional boiler but takes water directly from the mains supply to retain in a storage cylinder.

Price (Installed): From £1900 (inc. VAT)

Worcester Bosch Greenstar i Gas System Boiler Technical Specification

ManufacturerWorcester Bosch
ModelGreenstar I System 
CondensingYes
Efficiency Rating94%
Energy Efficiency ClassA Rated
LPG CompatibleYes
WarrantyUp to 7 years when installed by an accredited engineer
Central Heating Max. Output9.4 – 24.6 kW
MountingWall mounted
Weight30.9kg
Dimensions710mm (Height) x 400 (Width) x 330mm (Depth)

The Worcester Bosch Greenstar i Gas System is available in the following sizes – 9, 12, 15, 18, 21 and 24 kW.

Worcester Bosch Greenstar i Gas System Boiler Key Features

  • The Worcester Bosch Greenstar i Gas System is suitable for houses that have a hot water cylinder that needs to be incorporated into the heating system
  • It’s a simple, no-frills model
  • Like the other models in the Greenstar range, it has an ‘A’ energy efficiency rating and is 94% efficient
  • Can be used with some renewable energy generation devices, like solar panels

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About the Worcester Bosch Greenstar i Gas System Boiler

The Worcester Bosch Greenstar i Gas System is the company’s most popular system boiler. The range covers different sizes suitable for flats and small homes. One of the benefits of a system boiler is that you can access hot water from different parts of your home simultaneously without impacting the flow rate.

  • It’s a small size, which can fit in an airing cupboard, or fit on the wall in a kitchen or bathroom
  • Includes frost risk protection via the Large Condensesure-style siphon that is integrated into the boiler’s design
  • Integrates with smart technology, including Worcester Bosch’s EasyControl smart thermostat
  • Available with an extended warranty period
  • Part of the energy-efficient Greenstar range which has won the Which? ‘Best Buy’ award for ten years

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Our thoughts on the Worcester Bosch Greenstar i Gas System Boiler

The Worcester Bosch Greenstar i Gas System Boiler comes in a range of sizes – for smaller homes, all the way up to larger homes with more than 1 bathroom.

This range comes in four sizes which will suit any household. This style of boiler can generally provide more hot water than an equivalent standard combi-boiler. 

Reliable choice

The Greenstar i Gas System Boiler comes from Worcester Bosch and is really centred on reliability and energy efficiency. This boiler works by heating the water in your central heating system as well as by storing hot water in a domestic cylinder. When it comes to using water – it means that hot water is always available when you need it, even from different parts of your home simultaneously.

This boiler has an A ErP rating and operates at 94% efficiency – so your energy bills will initially stay low with this model.

Unfortunately, though, this efficiency won’t last forever. Whilst you will be able to benefit from excellent energy efficiency for a while, the components used within this boiler means they will be greatly affected after prolonged use. The biggest reason for this is because of the aluminium heat exchanger.

Aluminium heat exchanger 

An aluminium heat exchanger will offer great efficiency when the boiler is first installed. However, after a few years aluminium will start to corrode and corrosion equals a drop in efficiency. So whilst this boiler offers up to 94% efficiency from installation, this won’t last forever. 

It should be noted that the heat exchanger is covered by the guarantee but once out of warranty the repair costs for this will be costly.

Engage with new technology

You can use the Greenstar i Gas System Boiler via the conventional programmable control panel or thermostat. You also have the option to upgrade to a smart energy system which can improve the energy efficiency of the boiler even further. This model is compatible with the Worcester Bosch smart energy management system – EasyControl – as well as with other brands such as Nest and Tado. Smart thermostats integrate with your mobile device so you can control your heating wherever you are.

Assembled in Worcestershire

The Worcester Bosch Greenstar i Gas System Boiler is assembled in the Worcester Bosch production facility in Worcestershire. However, whilst it is assembled in Worcester, it is made up of many components from third party companies. This is a negative as there are equivalent boilers at a similar price point that utilise components that are all made in-house. The benefit from these competitors is that their components are designed to work efficiently with each other.

Wide availability of parts 

The parts for this boiler are widely available though. If you need a replacement item you can find spare parts at Screwfix, Plumbase and other plumbing merchants both in-store and online.

Plastic parts

With that said, a downside to the Worcester Bosch Greenstar i Gas System Boiler is that many of the parts utilised within it are made from plastic and are more prone to perishing than boilers containing higher quality brass parts.

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