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Greenstar 12i System

Mother and son with Greenstar boiler in background
Greenstar i System boiler

Description

Which? Best Buy logoGreenstar i System boilers are a good option for small to medium sized properties. They have compact dimensions which means that they can be installed in a variety of places.

The Greenstar i System boilers are used with heating systems that include stored hot water in a cylinder.

These boilers are also compatible with a wide range of optional digital controls.

For further peace of mind, every boiler in Worcester’s Greenstar gas and LPG condensing boiler range has been awarded a Which? Best Buy accreditation.

10 year guarantee on primary heat exchanger.

Central heating output: 12kW

Efficiency

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Features and benefits

  • Best official boiler efficiency rating (SEDBUK band A)
  • 2 year guarantee with 10 year guarantee on primary heat exchanger (subject to terms and conditions)
  • Compact dimensions – space saving and siting flexibility
  • Compatible with Greenskies solar water heating
  • Metal wall mounting frame with pipes behind - no exposed pipework

  • Vertical pre-piping kit

  • Below boiler pipe cover
  • Earth bonding strip

  • Low NOx and CO2 emissions - environmentally friendly

  • One-man-lift: 27kg

Technical data table

Technical data
Title Value
NOx classification with low NOx code plug (mg/kWh) 39
NOx classifications (mg/kWh) 44
Height (mm) 710mm (max)
Width (mm) 400mm
Depth (mm) 330mm (max)
Weight 27.1kg
Output to central heating 3-12.0kW (13,650-40,950 Btu's/hr)
Solar compatible Yes
Maximum horizontal flue (100mm Ø) 4,600mm (inc terminal)
Maximum vertical flue (100mm Ø) 6,400mm (inc terminal)
Maximum horizontal flue (125mm Ø) 13,000 (inc terminal)
Maximum vertical flue (125mm Ø) 15,000 (inc terminal)
Gas connection 22mm compression
Pressure relief valve 15mm Ø
Heating flow and return connections 22mm compression
Condensate connection 22mm plastic pipe
Primary water content 3.9 litres
NOx class Class 5
Wall mounting jig Yes
Plug-in timers Yes (optional)
Optimising room temperature controller Yes (optional)
Ingress protection rating X4D
SEDBUK value %/band - natural gas 90.1%/Band A
SEDBUK value %/band - LPG 91.4%/Band A

Literature

Product guides and brochures
Title/description Part number Order
Greenstar gas boiler brochure

A guide to our gas boilers and choosing the best boiler for your home.

8 716 109 642

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Product guide for gas boilers and solar heating

Quick pocket-sized reference for trade professionals on gas boilers and solar water heating.

8 716 116 255

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Product literature
Title/description Part number Order
Diverter valve instructions 8 716 115 701

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Gas boiler wiring guide 6 720 646 965

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Installation and servicing instructions for Greenstar I System (manufactured April 2005 - July 2008) 8 716 112 055

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Installation and servicing instructions for Greenstar i System (manufactured Aug 08 - July 09) 8 716 115 167

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Installation and servicing instructions for Greenstar i System (manufactured from Feb 2011) 6 720 644 743

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Installation and servicing manual for Greenstar i System (manufactured Aug 09 - Jan 11) 8 716 115 664

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Product bulletin: new low NOx boilers, new Greenstar Si and i System controls Gas PB 01/2011

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Tech and spec for wall mounted gas system boiler 8 716 115 775

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User manual for Greenstar i System (manufactured Aug 08 - July 09) 8 716 115 171

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User manual for Greenstar i System (manufactured Aug 09 - Jan 11) 8 716 115 663

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User manual for Greenstar i System (manufactured from Feb 2011) 6 720 644 864

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User manual for I System (manufactured April 2005 to July 2008) 8 716 107 376

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Accessory literature
Title/description Part number Order
DT10RF Digistat (MK 2) instructions 8 716 115 493

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DT10RF Digistat and digistat optimiser (MK 1) instructions 8 716 106 652

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DT20 Twin Channel Digital Timer user instructions 8 716 106 647

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DT20RF Digital RF thermostat with twin channel programmer (MK 1) instructions 8 716 106 659

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DT20RF Digital RF thermostat with twin channel programmer (MK 2) instructions 8 716 115 495

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Expansion vessel hose and syphon assembly 8 716 113 893

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Greenstar low loss header bulletin L-loss PB 12/2011

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Vertical pre-piping assembly fitting instructions 8 718 681 432

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Flue literature
Title/description Part number Order
60/100mm horizontal flue instruction manual 6 720 644 842

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60/100mm Vertical flue kit instructions 6 720 611 739

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80/125mm 45° flue duct kit instructions 6 720 641 098

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80/125mm 90° flue duct kit instructions 6 720 641 097

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80/125mm flue extension kit instructions 6 720 641 099

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80/125mm vertical flue kit instructions 6 720 611 740

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