Worcester Bosch 18Ri Heat Only Boiler Including Flue & 15mm Scale Reducer

The Worcester Bosch 18Ri Heat Only Boiler Including Flue & 15mm Scale Reducer is a compact, energy-efficient heating package designed for homes with a traditional open-vent or conventional heating system. Supplied with a horizontal flue kit and a 15mm Scale Reducer, this complete solution delivers reliable central heating while helping protect the boiler against limescale build-up in hard water areas. Combining Worcester Bosch's renowned engineering with a space-saving design, the Greenstar 18Ri offers dependable performance, low running costs, and long-term reliability.

Part of the trusted Worcester Bosch Greenstar Ri range, the 18Ri is designed to work alongside a separate hot water cylinder and cold water storage tank. Its compact cupboard-fit dimensions, quiet operation, and installer-friendly design make it an excellent replacement for older regular boilers while improving overall heating efficiency.

Key Features

• 18kW Heat Only (Regular) Boiler
• Includes Horizontal Flue Kit
• Includes 15mm Scale Reducer
• Fuel Type: Natural Gas
• Designed for open-vent and conventional heating systems
• Requires a separate hot water cylinder and cold water storage tank
• ErP A Rated heating efficiency
• Up to 92% seasonal efficiency
• Compact cupboard-fit design
• Quiet operation
• Multi-directional flue compatibility
• Compatible with Worcester Bosch heating controls
• Solar compatible
• Simple fascia-mounted temperature controls
• Up to 10-Year manufacturer's warranty (subject to installation, registration, and manufacturer's terms)

Ideal for Traditional Heating Systems

The Worcester Bosch 18Ri Heat Only Boiler is ideal for small to medium-sized homes with an existing conventional heating system, separate hot water cylinder, and cold water storage tank. It provides an efficient upgrade for older regular boilers while allowing homeowners to retain their existing heating system layout.

The included 15mm Scale Reducer helps minimise limescale build-up, making this package particularly suitable for properties located in hard water areas.

Reliable Central Heating Performance

With an 18kW central heating output, the Greenstar 18Ri delivers dependable and efficient heating throughout the home. As a Heat Only (Regular) Boiler, it is designed exclusively for central heating and works with a separate hot water cylinder to provide stored domestic hot water.

Its advanced condensing technology maximises seasonal efficiency while helping reduce fuel consumption and lower household heating costs.

Compact Design

Designed to fit neatly inside a standard kitchen cupboard, the Greenstar 18Ri offers excellent installation flexibility without compromising heating performance.

Dimensions

• Height: 600mm
• Width: 390mm
• Depth: 270mm

The included horizontal flue and 15mm Scale Reducer provide a complete installation package while helping maintain long-term boiler efficiency.

Advanced Energy Efficiency

Rated ErP A with 92% seasonal heating efficiency, the Greenstar 18Ri uses advanced condensing technology to maximise heating performance while reducing energy consumption. Its efficient operation helps lower running costs while maintaining consistent comfort throughout the home.

Smart Heating Control Compatibility

The Greenstar 18Ri is compatible with a range of Worcester Bosch heating controls, allowing homeowners to optimise comfort, improve energy efficiency, and better manage heating schedules. It is also compatible with solar thermal systems for greater future flexibility.

Reliable Performance & Easy Maintenance

Built with Worcester Bosch's renowned engineering quality, the Greenstar 18Ri features a durable, installer-friendly design with simple controls and convenient servicing access.

Its compact dimensions and flexible flue options make installation straightforward in both replacement projects and new heating system installations.

Warranty & Peace of Mind

The Worcester Bosch 18Ri Heat Only Boiler Including Flue & 15mm Scale Reducer includes up to a 10-Year manufacturer's warranty when installed and registered in accordance with Worcester Bosch's warranty requirements, providing long-term confidence and dependable after-sales support.

Why Choose the Worcester Bosch 18Ri Heat Only Boiler Including Flue & 15mm Scale Reducer?

• Complete boiler, flue, and scale protection package
• Efficient 18kW heat only boiler
• Natural Gas compatible
• Designed for traditional heating systems
• Includes Horizontal Flue
• Includes 15mm Scale Reducer
• Compact cupboard-fit design
• Solar compatible
• Compatible with Worcester Bosch heating controls
• Up to 10-Year manufacturer's warranty