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Worcester Bosch boilers

Our Worcester Bosch boiler range

As part of the Bosch Group, Worcester Bosch boilers are designed and built to exacting standards and constructed with only the highest quality materials, to provide the levels of quality and service that you would expect from a brand within the Bosch Group. Every single Worcester boiler is rigorously tested before it leaves the factory.

Understanding your boiler

There are a few things to consider when choosing a new boiler for your home, using the table below you can check the flow rate, the output, and the energy rating.

Flow rate

The flow rate refers to how much water can flow through the boiler and how fast it can come out of your tap or shower. It’s measured in litres per minute, and the higher the flow rate, the faster the boiler will be able to heat the water coming into your home.

Output

The output describes the amount of power the boiler can generate for your central heating. For example, a larger property may require heating output 17-20kw in comparison to a small property which may only require 9017kw.

Energy Rating

These EU regulated ratings start at A (meaning they are the most energy efficient) and descend to D (the least energy efficient). Choosing an appliance with an A rating or higher should mean your item uses a low amount of energy while still functioning well. This could result in lower gas and electricity bills[2]. That’s why we only install A-rated energy efficient boilers.

Our bestselling boilers

Best buy boiler

29CDi Classic

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) 12.3
Output kW 7.7-30.0
Energy rating
Best buy boiler

34CDi Classic

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) 14.3
Output kW 7.7-30.0
Energy rating
Best buy boiler

38CDi Classic

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) 16.4
Output kW 9.4-30.0
Energy rating

Or book a survey where your expert surveyor will find the perfect boiler for your home and lifestyle.

Get your instant quote online

With our Fixed Price Guarantee[28] what we say is what you’ll pay

Simply answer a few multiple choice questions about your existing boiler and we’ll give you a fixed price for a new boiler including all parts and installation.

With flexible finance available from just £17 a month[1].

Our full Worcester Bosch boiler range

42CDi Classic

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) 17.2
Output kW 7.7-30.0
Energy rating

28CDi Compact

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) 11.4
Output kW 7.03-24.0
Energy rating

32CDi Compact

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) 13.1
Output kW 7.03-24.0
Energy rating

36CDi Compact

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) 14.7
Output kW 7.03-24.0
Energy rating

25Si Compact

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) 10.2
Output kW 7.03-24.0
Energy rating

30Si Compact

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) 12.3
Output kW 7.03-24.0
Energy rating

25i

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) 10.2
Output kW 8.2-24.0
Energy rating

30i

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) 12.3
Output kW 8.2-24.0
Energy rating

Highflow 440CDi

Dimensions H: 850
W: 600
D: 600
Flow rate (Ltr per minute) 20
Output kW 7.4-29.2
Energy rating

Highflow 550CDi

Dimensions H: 850
W: 600
D: 600
Flow rate (Ltr per minute) 25
Output kW 9.7-30.6
Energy rating

30CDi Classic system

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) N/A
Output kW 7.7-30.0
Energy rating

35CDi Classic System

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) N/A
Output kW 7.7-34.0
Energy rating

9i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 3.1-9.2
Energy rating

12i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 3.1-12.2
Energy rating

18i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 4.6-15.3
Energy rating

21i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 4.6-18.4
Energy rating

24i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 7.2-21.6
Energy rating

27i System

Dimensions H: 710
W: 400
D: 330
Flow rate (Ltr per minute) N/A
Output kW 7.2-24.6
Energy rating

27i System

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) N/A
Output kW 7.03-27.0
Energy rating

30i System

Dimensions H: 690
W: 390
D: 280
Flow rate (Ltr per minute) N/A
Output kW 7.03-30.0
Energy rating

30CDi Classic Regular

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) N/A
Output kW 7.7-30.0
Energy rating

40CDi Classic Regular

Dimensions H: 760
W: 440
D: 360
Flow rate (Ltr per minute) N/A
Output kW 9.4-40.8
Energy rating

12Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 9.4-12.0
Energy rating

15Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 5.0-15.0
Energy rating

18Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 6.0-18.0
Energy rating

24Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 8.0-24.0
Energy rating

27Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 7.03-27.0
Energy rating

30Ri

Dimensions H: 600
W: 390
D: 270
Flow rate (Ltr per minute) N/A
Output kW 7.03-30.0
Energy rating

FS 30CDi Regular

Dimensions H: 850
W: 400
D: 600
Flow rate (Ltr per minute) N/A
Output kW 7.7-30.0
Energy rating

FS 42CDi Regular

Dimensions H: 850
W: 400
D: 600
Flow rate (Ltr per minute) N/A
Output kW 9.6-40.8
Energy rating

Book a survey where your expert surveyor will find the perfect boiler for your home and lifestyle.

Which Best Buy

In the last boiler survey in Which? Magazine (2015), Worcester Bosch were awarded Best Buys for their entire Greenstar range of gas boilers (33 models in total); and they are the only boiler manufacturer to achieve a Which? Best Buy for 6 consecutive years.

Get in touch with us today

If you know which boiler and central heating system is right for you, or if you need more information, fill in the form below or give us a call.

0203 763 2682

Simply fill in this form and we’ll call you straight back.

Book your free no obligation quote today.

[1] Representative Example: Cash Price £2246 less a deposit of £1070.50 Total Loan amount = £1175.50. Repayable by 120 monthly repayments of £17. Total Charge for credit = £864.50. Total Amount Repayable £3110.50 (includes £1070.50 deposit). Interest rate is 12.2% per annum fixed. Representative APR 12.9% fixed. Subject to status.

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

[28] Exclusions apply. See help-link.co.uk/FAQs