Greenstar Si Compact overview

Our Greenstar Si Compact combi boiler is suitable for small to medium sized homes with one bathroom.

With hot water flow rates of up to 12.3 litres/min, the Greenstar Si has a host of design features for ease of installation, use and servicing and can also fit within a standard kitchen cupboard.
Greenstar Si Compact Greenstar Si Compact Greenstar Si Compact
Greenstar Si Compact Greenstar Si Compact Greenstar Si Compact

Features & Benefits

Wall mounting jig providing pre-plumbing and rear piping as standard
Low lift weight
Fits in a standard kitchen cupboard
Central heating flow and hot water temperatures can be adjusted using simple control knobs
Plug & play optional Worcester controls available
Commissiong information for easier completion of the Benchmark checklist
Clear operational information and diagnostic display
High efficiency and greater reliability with our innovative WB7 heat exchanger
Colour-coded wiring connectors for error free connection and removal
Compatible with CondenseSure accessory - eliminates risk of condensate pipe freezing*
Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet connected control
Scan and register the boiler using our FREE online registration app

Technical Details

Greenstar 25Si Compact Greenstar 30Si Compact
Part number 7 733 600 050 7 733 600 052
ErP Efficiency Rating
A
A
A
A
Solar Compatible
Wave Compatible
Control Options
Dimensions (mm) height x width x depth 690 x 390 x 280 690 x 390 x 280
Clearances (mm) above, sides, below and front 30, 5, 200, 600 (fixed surface) & 20 (cupboard door) 30, 5, 200, 600 (fixed surface) & 20 (cupboard door)
Maximum horizontal flue (mm) 6000 6000
Maximum vertical flue (mm) 6000 6000
Ingress protection rating X4D X4D
Wall mounting jig supplied
Central heating output (kW) 24 24
Max DHW output (kW) 25 30
Hot water flow rate (litres per minute) 10.2 @ 35°c ∆T 12.3 @ 35°c ∆T
Minimum inlet pressure (bar) 1.6 1.6
NOx emissions (mg/kWh) 35 35
Lift weight (kg) 32.9 32.9

*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
Flue Gas Heat Recovery Unit
Flue Gas Heat Recovery Unit 7 733 600 047
Keyless Filling Link
Keyless Filling Link 7 716 192 610
Greenstar System Filter
Greenstar System Filter 7 716 192 609
Condensesure
Condensesure 7 716 192 746
Below boiler pipe cover
Below boiler pipe cover 7 716 192 608
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
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
Horizontal flue kit (125mm dia.)
Horizontal flue kit (125mm dia.) 7 719 003 702
Long telescopic flue kit (100mm dia.)
Long telescopic flue kit (100mm dia.) 7 716 191 171
Support bracket kit (100mm dia.)
Support bracket kit (100mm dia.) 7 716 191 177
High level horizontal telescopic 60/100mm flue kit
High level horizontal telescopic 60/100mm flue kit 7 733 600 048
Support bracket 6 pack (100mm dia.)
Support bracket 6 pack (100mm dia.) 7 716 191 178
Support bracket (125mm dia.)
Support bracket (125mm dia.) 7 716 191 179
60/100mm (x2) 45º bends
60/100mm (x2) 45º bends 7 716 191 085
Vertical BF kit (125mm)
Vertical BF kit (125mm) 7 719 002 431
Short flue extension, 220mm (100mm dia)
Short flue extension, 220mm (100mm dia) 7 716 191 133
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
2m flue extension (100mm dia.)
2m flue extension (100mm dia.) 7 716 191 172
High level horizontal flue adaptor (100mm dia)
High level horizontal flue adaptor (100mm dia) 7 719 002 432
Vertical BF kit (100mm)
Vertical BF kit (100mm) 7 719 002 430
High level horizontal flue adaptor (125mm dia)
High level horizontal flue adaptor (125mm dia) 7 719 002 433
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

Can't find the literature you're looking for?

Visit our dedicated literature section where you can search by product name, serial number and more.