Greenstar 28i Junior
Description
The Greenstar i Juniors are our ‘entry level’ boilers. They’re suited to apartments and small to medium sized properties with 1 bathroom.
Compact in size, the Greenstar i Junior combi boilers can be installed in a number of locations and are compatible with a choice of optional heating 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: 24kW
Domestic hot water flow rate: 11.4 litres per minute at 35 degree temperature rise (provided adequate mains pressure is available)
Efficiency
Print a handy summary about this product
Features and benefits
- Best official boiler efficiency rating (SEDBUK band A)
- 2 year guarantee, 10 year guarantee on primary heat exchanger and 5 year anti-scale guarantee on domestic hot water heat exchanger (subject to terms and conditions)
- Compact dimensions – space saving and siting flexibility
- Central heating temperature control
- Keep hot facility - instantly heated hot water
Metal wall mounting frame allows pipework to be hidden from view
Vertical pre-piping kit
- Below boiler pipe cover
Earth bonding strip
Multi-directional fluing means the boiler can be sited in a wider variety of places
Low NOx and CO2 emissions - environmentally friendly
Mechanical and digital controls all compatible
Technical data table
| Technical data | |
|---|---|
| Title | Value |
| Ingress protection (IP) | X4D |
| NOx classification with low NOx code plug (mg/kWh) | 38 |
| NOx classifications (mg/kWh) | 66 |
| Height (mm) | 710mm (max) |
| Width (mm) | 400mm |
| Depth (mm) | 330mm (max) |
| Weight | 27.1kg |
| DHW flow rate @ 35°C rise | 11.4 l/min |
| Output to central heating | 7.2 - 24kW (24,566 - 82,000Btu/hr) |
| Solar compatible | No |
| Maximum horizontal flue (100mm Ø) | 4,600mm (inc. terminal) |
| Maximum vertical flue (100mm Ø) | 6,400mm (inc. terminal) |
| Maximum horizontal flue (125mm Ø) | 13,000mm (inc terminal) |
| Maximum vertical flue (125mm Ø) | 15,000mm (inc. terminal) |
| Mains cold water inlet | 15mm compression |
| Domestic hot water outlet | 15mm compression |
| Gas connection | 22mm compression |
| Pressure relief valve | 15mm |
| Heating flow and return connections | 22mm compression |
| Condensate connection | 22mm plastic pipe |
| Maximum domestic water inlet pressure | 10bar |
| Minimum domestic water inlet pressure for maximum DHW rate | 1.3bar |
| Minimum domestic water inlet pressure to operate the appliance | 0.2bar |
| Primary water content | 3.9 litres |
| NOx class | Class 5 |
| Wall mounting jig | Yes |
| Filling link | Optional |
| Plug-in timers | Yes (optional) |
| Optimising room temperature controller | N/A |
| Condensing in DHW mode | No |
| SEDBUK value %/band - natural gas | 90.1%/Band A |
| SEDBUK value %/band - LPG | 91.8%/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 | |||
| 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 | |||
Download (1.24 Mb)
Order a printed copy| Accessory literature | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| DT10RF Digistat (MK 2) instructions | 8 716 115 493 | |||
| DT10RF Digistat and digistat optimiser (MK 1) instructions | 8 716 106 652 | |||
| DT20 Twin Channel Digital Timer user instructions | 8 716 106 647 | |||
| DT20RF Digital RF thermostat with twin channel programmer (MK 1) instructions | 8 716 106 659 | |||
| DT20RF Digital RF thermostat with twin channel programmer (MK 2) instructions | 8 716 115 495 | |||
| Expansion vessel hose and syphon assembly | 8 716 113 893 | |||
| Integral charging link fitting and user instructions | 8 716 114 661 | |||
| MT10 instructions | 8 716 106 641 | |||
| MT10RF mechanical RF thermostat instruction manual | 8 716 107 486 | |||
| MT10RF user instructions (MK II models from Aug 09) | 8 716 115 752 | |||
| Quick start guide for MT10RF | 8 716 115 007 | |||
| Tech and spec for heating controls | 8 716 115 653 | |||
| Vertical pre-piping assembly fitting instructions | 8 718 681 432 | |||
| Flue literature | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| 60/100mm horizontal flue instruction manual | 6 720 644 842 | |||
| 60/100mm Vertical flue kit instructions | 6 720 611 739 | |||
| 80/125mm 45° flue duct kit instructions | 6 720 641 098 | |||
| 80/125mm 90° flue duct kit instructions | 6 720 641 097 | |||
| 80/125mm flue extension kit instructions | 6 720 641 099 | |||
| 80/125mm horizontal flue instructions | 6 720 611 436 | |||
| 80/125mm vertical flue kit instructions | 6 720 611 740 | |||
PDF files can be read with
Adobe Acrobat Reader
Social media