Worcester Bosch Greenstar 15 RI Regular Gas Boilers
Cupboard-Sized Comfort
The Worcester Bosch Greenstar Ri delivers reliable heating and hot water in a compact design. Available in outputs from 12kW to 24kW, it fits neatly into a kitchen cupboard and is solar compatible, helping you cut energy bills while supporting a greener lifestyle.
With its simple, user-friendly display for easy control and the reassurance of up to a 10-year guarantee. The Greenstar Ri combines comfort, efficiency, and long-term peace of mind.
- Gas
- Regualr
Compact design – Fits neatly inside a standard kitchen cupboard
Bosch quality – Trusted performance and reliability for your home
Added efficiency – Compatible with solar panels to help reduce energy bills
Simple controls – Straightforward temperature control for easy adjustments
Flexible outputs – Available in 12kW–24kW to suit a wide range of homes
Greenstar 12Ri
ErP Efficiency Rating: A
Fuel Type: Natural Gas (NG)
Control Options: EasyControl compatible†
Solar Compatible: Yes
Central Heating Output: 12kW
Dimensions (H x W x D): 600 x 390 x 270mm
Greenstar 15Ri
ErP Efficiency Rating: A
Fuel Type: Natural Gas (NG)
Control Options: EasyControl compatible†
Solar Compatible: Yes
Central Heating Output: 15kW
Dimensions (H x W x D): 600 x 390 x 270mm
Greenstar 21Ri
ErP Efficiency Rating: A
Fuel Type: Natural Gas (NG)
Control Options: EasyControl compatible†
Solar Compatible: Yes
Central Heating Output: 21kW
Dimensions (H x W x D): 600 x 390 x 270mm
Greenstar 24Ri
ErP Efficiency Rating: A
Fuel Type: Natural Gas (NG)
Control Options: EasyControl compatible†
Solar Compatible: Yes
Central Heating Output: 24kW
Dimensions (H x W x D): 600 x 390 x 270mm
Additional Note:
The Condensesure Siphon has been proven to prevent frozen condensate at -15°C for up to 48 hours, provided 32mm pipework (no longer than 3m) is used.
†An EasyControl adaptor is required for Bosch EasyControl to work with Greenstar regular boilers.
10-Year Guarantee – enjoy complete peace of mind with reliability
Compact design – Fits neatly inside a standard kitchen cupboard without taking up valuable space
Flexible outputs – Available in 12kW, 15kW, 21kW and 24kW to suit small, medium, and large homes
High efficiency – ErP A-rated for energy efficiency, helping to reduce heating bills
Solar compatible – Works with solar panels for even greater energy savings and sustainability
Smart control ready – Compatible with Bosch EasyControl† for intelligent, app-based heating management
Reliable heating & hot water – Perfect for busy households with high heating demands
Proven winter protection – Condensesure Siphon helps prevent frozen condensate in extreme cold (-15°C for 48 hours)
What’s Included with The Boiler Team Installation?
- Installed by a local Gas Safe engineer
- Old boiler & tanks removed (if applicable)
- All waste cleared, including the old boiler
- Flue installation for optimal performance
- Magnetic filter to protect your system
- System cleanse + protective treatments included
- Pipework upgrades were required
- Premium copper & fittings supplied
- Electrical setup, including wireless thermostat (if applicable)
- Delivery & setup arranged for you
- Warranty registration & certification handled
- Manufacturer parts & labour warranty included
- 10-Year workmanship guarantee from The Boiler Team
Frequently Asked Questions About Worcester Bosch
Get all the essential information you need to choose the perfect Worcester Bosch boiler for your home, from efficiency and size to features and installation tips.
It’s a regular boiler (conventional), working with a hot water cylinder and cold water tank, ideal for homes with high hot water use.
It’s available in 12kW, 15kW, 21kW, and 24kW models to suit different home sizes and heating needs..
Yes, its compact size (600 x 390 x 270mm) is designed to fit neatly into a standard kitchen cupboard
Yes – it’s ErP A-rated, meaning it delivers efficient heating while helping to lower energy bills and carbon footprint.
Yes, it’s solar compatible, making it a greener, more cost-effective option for households with renewable energy systems.
Yes, it works with Bosch EasyControl†, allowing you to control your heating from your smartphone or tablet.
It’s best suited to medium to large homes with multiple bathrooms, where hot water demand is higher.
Backed by Bosch engineering, it’s highly reliable and comes with up to a 10-year guarantee† when professionally installed.
†Adaptor required for Bosch EasyControl compatibility. Guarantee terms apply.
Yes – the Condensesure Siphon prevents frozen condensate pipes, keeping the boiler running even at -15°C for 48 hours.
It offers a compact design, flexible outputs, energy efficiency, solar compatibility, and Bosch quality, making it one of the UK’s most trusted boilers.
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