Worcester Bosch Boiler Guide

Matthew Knight

In this article

British manufacturer Worcester Bosch has been making domestic gas boilers since 1962. It employs more than 2,000 people in Worcester and Derbyshire and is part of the multinational Bosch Group.

Worcester Bosch offers four types of combi boilers that supply heat and instant hot water. The Greenstar Junior series is the basic-level range for apartments and one-bathroom properties. The Greenstar Si series is for slightly larger properties and offers a higher hot water flow rate. The top of the range Greenstar CDi range can cope with properties with two bathrooms and provide flow rates of up to 17.2 litres per minute. The Greenstar Highflow CDi series comprises of floor-standing combis for large properties.

For homes with a traditional heat-only boiler (those that use a cold water tank and hot water cylinder for the hot water supply), Worcester Bosch offers the Greenstar Ri series that can be installed in a cabinet, the higher powered CDi boilers for larger properties and the FS CDi regular for properties where a wall-mounting is not feasible.

The compact Greenstar 12i to 24i series and larger 30CDi system boiler provide a wide range of outputs for homes that use a hot water cylinder but no cold water tank.

You can find more details about the individual products in these ranges in our Worcester Bosch boiler reviews.

More than 7,000 members of the general public take part in our annual boiler brand reliability and customer satisfaction survey, enabling us guide you to the best and worst boiler brands. We also conduct a survey with more than 150 trusted boiler engineers to get their independent views on which boiler brands are the best.

Which? verdict on Worcester Bosch boilers

Here, you'll find all of our survey results for Worcester Bosch boilers, including how reliable Worcester Bosch boilers are, what Worcester Bosch owners really think of their boiler, what trusted engineers think of Worcester Bosch boilers' build quality, and much more.

The reliability and customer score are based on responses from a May and June 2020 survey of 7,500 boiler owners. Engineer recommendation, build quality, availability of parts and spares, and ease of fixing a common fault and ease of servicing are based on responses to a June 2020 survey of 153 Which? Trusted Traders heating engineers.

Which? members can log in to see what owners and engineers make of Worcester Bosch boilers. If you're not already a member, try Which? and get access to the scores in the table below.

Overall score
Reliability
Customer score
Engineer recommendation
Build quality
Availability of parts and spares
Ease of fixing a common fault
Ease of servicing

How much do Worcester Bosch boilers cost?

Worcester Bosch gas boilers cost between £570 and £1,500, depending on their type and size.

Choosing the best Worcester Bosch boiler

Worcester Bosch boilers are not sold directly by Worcester Bosch. Instead, they tend to be supplied through Worcester Accredited Installers. Many accredited installers specialise in Worcester products and most can offer extended guarantees. It's also possible for any installer in the country to install a Worcester Bosch boiler, even if they're not accredited, however you might not get as long a guarantee if this is the case.

If you have any problems with your new appliance during the manufacturer’s guarantee period, you should contact your installer first to ensure it is an appliance fault.

Worcester boilers are guaranteed against faulty materials or workmanship for five years from the date of installation. During this period, Bosch Thermotechnology Ltd (the Worcester parent company) will repair any components that are faulty or defective for free. The guarantee must be registered within 30 days of installation.

Unusually, Worcester offers a 10-year guarantee on the heat exchangers in its boilers, provided that the boiler’s installation meets strict criteria on the sizing and positioning of the boiler – basically following best-practice guidelines. Otherwise it offers a two-year parts and labour warranty.

Worcester servicing and repairs

Worcester claims to have 300 service engineers across the UK and Ireland.

Worcester offers its own Service Plan for boilers that are out of guarantee. This covers up to £1,500 of approved boiler repairs every year, carried out by Worcester boiler engineers. It also includes a yearly service to ensure your boiler is running efficiently and safely. Find out how Worcester's service plan customers rate the service they receive in our full .