The smarter way to replace your boiler

  • Get FREE Quotes today
  • Compare quotes & save money
  • Over 5,000 engineers across the UK
Tell us about your job
Get Free Quotes

Worcester Bosch Greenstar CDi Classic Combi Boilers

Worcester Bosch Greenstar CDi Classic Combi boilers are Worcester Bosch’s top of the range heating appliances. With average prices ranging from between £800 – £1240 excluding VAT and installation, this boiler guarantees reliability, fuel efficiency and a user-friendly interface.

The Greenstar CDi Classic combi gas boiler is available in four heating outputs: 29, 34, 38 and 42KW; making it suitable for many property types. For instance, higher outputs of CDi Classic, 38CDi and 42CDi are perfect for larger properties with two or more bathrooms and a greater demand for hot water. Whereas the Classic Greenstar 29CDi and 34 CDi combi boilers are designed for smaller properties where demands are lower.

Key features include a choice of operating features for greater user comfort and economy, and market-leading boiler technology which significantly increases central heating outputs and hot water flow rates despite its compact dimensions.

Worcester Bosch Greenstar CDi Classic Combi boilers are also condenses in both heating and hot water modes, resulting in less fuel burned. Also, a modulating pump allows a reduction of electrical energy usage by up to 30%. It also has sophisticated intelligent controls which provide the ultimate in user convenience, performance and economy.

For peace of mind it also comes with up to a 5 year warranty.

Worcester Bosch Greenstar CDi Classic Combi Boilers Overview


ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Greenstar 29CDi ClassicCombiH – 760 mm
W – 440 mm
D – 360 mm
12.3 l/min29 kWA 90% and above£1018.8
Greenstar 34CDi ClassicCombiH – 760 mm
W – 440 mm
D – 360 mm
14.3 l/min34 kWA 90% and above£1062.46
Greenstar 38CDi ClassicCombiH – 760 mm
W – 440 mm
D – 360 mm
16.4 l/min38 kWA 90% and above£1274.21
Greenstar 42CDi ClassicCombiH – 760 mm
W – 440 mm
D – 360 mm
17.1 l/min42 kWA 90% and above£1435.01
Key Features & Benefits
SEDBUK Band AHigh energy efficiency Economy
Fullly condensing in both central heating and domestic hot water modesHigh energy efficiency Economy
Heat load and flow generated precisely to meet the heating system’s requirements using a modulating pumpHigh energy efficiency Economy
Extremely small standby electrical output of 3.5WSuitable for smaller properties
NOx Class 5Environmental friendly
Compact, modern design with wall mounting frame that hides pipework.Modern design
Compact dimensionsSiting flexibility
Multi-directional fluingSiting flexibility
Mechanical, digital and new generation intelligent controlsUser comfort Energy efficiency Boiler reliability Economy
Hot water and central heating temperatures can be controlledUser Comfort
Keep hot facility for instant hot waterConvenience
2 or 5 year Warranty until 30th June 2013 (terms & conditions apply) and 10 year guarantee on primary heat exchanger.Peace of mind
5 year anti-scale guarantee on domestic hot water heat exchangerPeace of mind

What We Think of the Worcester Greenstar CDi Classic

With four heat outputs, this range of hard-working boilers can cater for most properties (from a small to medium sized house). They go from the 29kW unit, right through to 42kW with two medium sized models, 34kW and 38kW. They are Combi boilers, meaning that hot water for the taps is provided on demand and is also sent to the radiators.

The smaller model delivers 12.3 litres of hot water a minute, whilst the larger a significant 17.1 litres. Because these are powerful models, they are ideal for older properties which many not be so well insulated.

Not unsurprisingly with all its power and abilities, these boilers are not the slimmest you’ll find and they weigh nearly 50kg and have a fair-sized case.

However, the boilers are not mean with their controls so the user can make it do most things, especially split the heating and hot water temperature levels.

They can run on LPG, as well as natural gas.

Getting a Competitive Boiler Quote

We suggest you ask for a few quotes from local boiler installers and a national installer and compare prices of the Greenstar CDi Classic for the best price on the market.

Also, make sure your engineer is Gas Safe Registered.

Get Worcester Boiler Quotes

Get quotes to supply a new Worcester boiler now


3 reviews for Worcester Bosch Greenstar CDi Classic Combi Boilers

What Customers Are Saying

Rated 5 out of 5
8 July 2016

No Title

Had the 38CDi installed May 13. It’s outstanding. Endless hot water on demand, which I was concerned about having never had a combi before, totally unfounded. Manages 12 radiators with ease. Uses 35% less gas then previous boiler. Only seen the engineer during the annual service, which is only about £35/£40. Reading other reviews, pleased to say we have a conventional programmer. Estimate with 7yr guarantee, (fitted by Bosch approved engineer), reduced gas bills, minimal servicing costs and no longer having to buy a B/Gas Plan, this will pay for itself before the warranty expires….

Rated 4 out of 5
14 May 2016

No Title

Have not had much time on the boiler itself but seems OK.
But as above comments by Stephen Yates, I bought the wave wi fi programmer.
It is indeed the most user Unfriendly device I have ever come across.
It is utter CRAP. For gods sake get it redesigned and make it easier to understand and use.

Roy Miller
Rated 4 out of 5
20 February 2014

No Title

Boiler is wonderful in every way, have seen the gas consumption drop dramatically.
The wiFi programmer however is another matter, it’s the worst device I’ve ever come across in terms of being user friendly, practical and fit for purpose.
It’s clearly not been thought out or thoroughly tested on Joe public that’s going to have to use it…
Even my plumber can’t explain it or use it confidently.
Send the team who devised it’s functionality and program and back to basics.

Stephen Yates