Greenstar CDi Classic overview

Our Greenstar CDi Classic combi is our top-of-the-range combi boiler with a market leading output of up to 42kW.

Suitable for all homes with one or two bathrooms, and hot water flow rates of 17.2 litres/min, this boiler is renowned for its ease of installation, advanced features and future-proof technology.

Advanced features include the ability to range-rate the CH output to perfectly match the home's requirement.

Greenstar CDi Classic Greenstar CDi Classic Greenstar CDi Classic
Greenstar CDi Classic Greenstar CDi Classic Greenstar CDi Classic

Features & Benefits

Wall mounting jig providing pre-plumbing and rear piping as standard
Highest hot water flow rate of the Greenstar combi wall mounted range
Interior space optimised for serviceability
Simple boiler control knobs with clear information display and one button commissioning mode
Engineer menus to optimise commissioning and support servicing
Plug & play optional Worcester controls available
Large siphon inside - eliminates risk of condensate pipe freezing*
Inbuilt keyless filling link provided as standard
Full range of Condensfit II™ horizontal and vertical flue options with optional plume management kit available
Scan and register the boiler using our FREE online registration app

Technical Details

Greenstar 29CDi Classic Greenstar 34CDi Classic Greenstar 38CDi Classic Greenstar 42CDi Classic
Part number 7 738 100 248 7 738 100 250 7 738 100 252 7 738 100 246
ErP Efficiency Rating
A
A
A
A
A
A
A
A
Solar Compatible
Wave Compatible
Control Options
Dimensions (mm) height x width x depth 760 x 440 x 360 760 x 440 x 360 760 x 440 x 360 760 x 440 x 360
Clearances (mm) above, sides, below and front 30, 5, 200, 600 30, 5, 200, 600 30, 5, 200, 600 30, 5, 200, 600
Maximum horizontal flue (mm) 7900 (29CDi) 7000 (34CDi) 6000 (38 + 42CDi) 7900 (29CDi) 7000 (34CDi) 6000 (38 + 42CDi) 7900 (29CDi) 7000 (34CDi) 6000 (38 + 42CDi) 7900 (29CDi) 7000 (34CDi) 6000 (38 + 42CDi)
Maximum vertical flue (mm) 9400 (29CDi) 8000 (34CDi) 7500 (38 + 42CDi) 9400 (29CDi) 8000 (34CDi) 7500 (38 + 42CDi) 9400 (29CDi) 8000 (34CDi) 7500 (38 + 42CDi) 9400 (29CDi) 8000 (34CDi) 7500 (38 + 42CDi)
Ingress protection rating X4D X4D X4D X4D
Wall mounting jig supplied
Central heating output (kW) 30 30 30 30
Max DHW output (kW) 30.9 35 40 42
Hot water flow rate (litres per minute) 12.3 @35°c ∆T 14.3 @ 35°c ∆T 16.4 @ 35°c ∆T 17.2 @ 35°c ∆T
Minimum inlet pressure (bar) 1.4 1.5 1.7 1.9
NOx emissions (mg/kWh) 33.3 33.3 21.8 21.8
Lift weight (kg) 47.5 47.5 47.5 47.5

*The Condensesure Siphon has been proven to be effective at preventing frozen condensate at -15°C for a sustained period of 48 hours. 32mm pipework must be used and should not exceed 3 metres in length

Frequently Asked Questions

Question
Can I use artificially softened water in the heating circuit with my boiler?
Can Worcester products be used with underfloor heating?
What ventilation do I need?
Do you recommend treatment of the central heating water?
How does part L of the Building Regulations affect my boiler installation?
What is ErP?
What is Energy Labelling?
How will ErP affect me and my business?
How will ErP benefit me and my business?
Under ErP, what about systems that contain different products?
How do controls affect ErP?
As an installer, am I required to print the efficiency label? Or am I required to make a label and send it out?
Can you advise where to find and learn more on how to calculate and provide an ErP label?
What if I install a system with a programmer or other non-Worcester components? Will I still be able to use the Worcester ErP online tool?
Why is it necessary when we already have an appliance label and a home Energy Performance Certificate both of which are based on the well understood A-G scale?
Which programmers are compatible with my gas boiler?
Can I put flue elbows straight on top of the boiler?
Do I need a standoff kit to pipe up the back of your boilers?
Why is the boiler blowing fuses?
Why is the pump running constantly on a Greenstar CDi boiler?
Where can I find the FD (serial) number on a Greenstar boiler?
Can I fit your controls to an external oil boiler?
Can I run boiler flues outside?
Does an external condensate pipe have to be insulated?
Can I use third party controls with your boilers?
Why is the controller on a combi boiler twin channel?
Do I remove the link wire in the boiler when fitting a Worcester control?
Which connector block do I use on a Greenstar boiler when wiring a Wave smart internet connected controller?
Find answer to more frequently asked questions

Related Accessories

Boiler Accessories Part number
Greenstar Comfort wall mounting plate
Greenstar Comfort wall mounting plate 7 733 600 039
Greenstar System Filter
Greenstar System Filter 7 716 192 609
Vertical Pre-piping Assembly Kits
Vertical Pre-piping Assembly Kits 7 716 192 607
Keyless Filling Link
Keyless Filling Link 7 716 192 610
Condensesure
Condensesure 7 716 192 746
Remote pressure relief valve kit
Remote pressure relief valve kit 7 716 161 071
Below boiler pipe cover
Below boiler pipe cover 7 716 192 608
Earth bonding strip
Earth bonding strip 7 716 192 686
Flashing Kits Part number
Pitched roof flashing kit (100mm & 125mm dia)
Pitched roof flashing kit (100mm & 125mm dia) 7 716 191 091
Flat roof flashing kit (100mm & 125mm dia.)
Flat roof flashing kit (100mm & 125mm dia.) 7 716 191 090
Flue Part number
Support bracket kit 6 pack (100mm dia.)
Support bracket kit 6 pack (100mm dia.) 7 716 191 173
Support bracket kit (125mm dia.)
Support bracket kit (125mm dia.) 7 716 191 174
60/100mm (x2) 45º bends
60/100mm (x2) 45º bends 7 716 191 085
Horizontal flue kit (125mm dia.)
Horizontal flue kit (125mm dia.) 7 719 003 702
1000mm extension (125mm dia.)
1000mm extension (125mm dia.) 7 719 003 666
Long telescopic flue kit (100mm dia.)
Long telescopic flue kit (100mm dia.) 7 716 191 171
90º bend (125mm dia.)
90º bend (125mm dia.) 7 719 003 664
45 degree bend (100mm dia.)
45 degree bend (100mm dia.) 7 719 003 665
Vertical BF kit (125mm)
Vertical BF kit (125mm) 7 719 002 431
Vertical BF kit (100mm)
Vertical BF kit (100mm) 7 719 002 430
Support bracket kit (100mm dia)
Support bracket kit (100mm dia) 7 716 191 092
90º bend (100mm dia.)
90º bend (100mm dia.) 7 716 191 084
1000mm extension kit (100mm dia.)
1000mm extension kit (100mm dia.) 7 716 191 083
Short flue extension, 220mm (100mm dia)
Short flue extension, 220mm (100mm dia) 7 716 191 133
2m flue extension (100mm dia.)
2m flue extension (100mm dia.) 7 716 191 172
High level horizontal flue adaptor (125mm dia)
High level horizontal flue adaptor (125mm dia) 7 719 002 433
High level horizontal flue adaptor (100mm dia)
High level horizontal flue adaptor (100mm dia) 7 719 002 432
Standard telescopic horizontal flue kit (100mm dia)
Standard telescopic horizontal flue kit (100mm dia) 7 716 191 082
Plume Part number
Plume management kit (60mm dia)
Plume management kit (60mm dia) 7 716 191 086
Plume management terminal guard round (60mm dia.)
Plume management terminal guard round (60mm dia.) 7 716 191 176
90º bend
90º bend 7 716 191 088
45º bend (x2)
45º bend (x2) 7 716 191 089

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