This combi boiler provides central heating and instantaneous domestic hot water generation for residential and light-commercial installations. It runs on natural gas and is designed for wall mounting, integrating with a compatible horizontal flue to expel combustion gases while condensing to recover heat from flue vapours.

Worcester Bosch Greenstar 4000 25 kW Natural Gas Combi Boiler 7733600371

Making specification and fitting simple, this complete boiler pack is built around the Worcester Bosch 4000 25kW boiler and a compatible flue.

Worcester Bosch Greenstar 4000 25kW NG combi boiler, flue and comfort pack

Worcester Bosch Greenstar 2000 25kW NG combi boiler and flue pack

Offering ErP A-rated heating and hot water delivery, the Worcester Bosch Greenstar 4000 GR4700iW 25 C NG combi boiler pack provides homeowners with economy, comfort and efficiency. Easy to install, this well-designed 25kW condensing combi boiler is supplied with a flue for quick fitting in one easy job. The Greenstar 4000 is designed with a simple, clear display panel for ease of use and fast troubleshooting.

Worcester Bosch Greenstar 4000 25kW NG combi boiler and flue pack

This combi boiler provides central heating and domestic hot water generation for oil-fired installations in buildings. Designed for floor‑standing installation, it integrates with Bosch parts and accessories and operates as a compact, heavy‑duty unit suited to technical installations where a robust heating source is required.

Worcester Bosch Heatslave II 2022+ 18/25 25 kW Oil Combi Boiler 7731600261 - Price Offer

This combi boiler is a wall-mounted LPG unit designed to provide central heating and instantaneous hot water for domestic and light commercial systems. It operates as a compact, single-appliance solution suited to properties that require a combined heating and hot-water source, offering an energy-focused approach to fuel use in installations where liquefied petroleum gas is the supply.

Worcester Bosch Greenstar 4000 25 kW LPG Combi Boiler 7733600372

This combi boiler provides oil-fired central heating and domestic hot water generation for commercial and industrial installations. Designed as a floor‑mounted unit, it integrates with Bosch parts and accessories to serve plant rooms and technical heating systems where continuous flow and a compact installation footprint are required.

Worcester Bosch Heatslave II 2022+ 18/25 25 kW Oil Combi Boiler 7731600264 - Price Offer

This combi boiler provides combined space heating and domestic hot water generation for buildings using oil as fuel. It is a floor-mounted unit designed for integration with compatible Bosch parts and accessories and is intended for use with Heatslave II 2022+ systems in industrial and commercial installations where compact, high-capacity oil-fired heating is required.

Worcester Bosch Heatslave II 2022+ 18/25 25 kW Oil Combi Boiler 7731600261

This combi boiler provides combined space heating and hot-water delivery for commercial and industrial settings using oil as its fuel source. It is a floor-standing unit designed for integration with compatible parts and accessories from the same manufacturer and suits installations where continuous hot-water flow rates and sustained heat output are required.

Worcester Bosch Heatslave II 2022+ 18/25 25 kW Oil Combi Boiler 7731600264

This combi boiler provides central heating and instantaneous hot water for domestic natural gas systems. Designed for wall mounting, it combines efficient heat generation with a compact white cabinet suited to plant rooms and service cupboards. The unit is intended for installations where space conservation and continuous hot-water delivery are required.

Worcester Bosch Greenstar 4000 25 kW Natural Gas Combi Boiler 7733600371 - Price Offer

This heat-only boiler provides oil-fired central heating for commercial or industrial settings, delivering steady thermal output for space-heating systems. Designed for floor installation, it integrates with existing hot-water circuits and can operate alongside renewable thermal inputs. The unit is intended for technical users who require a compact, energy-conscious source of heat that fits plant rooms and utility spaces.

Worcester Bosch Greenstar Danesmoor Utility 25 kW Oil Heat Only Boiler 7731600246 - Price Offer

This heat-only boiler provides oil-fired central heating for external installation, designed to serve domestic and light-commercial heating circuits. It is a floor-standing steel unit finished in white and intended to deliver steady heat output while operating outdoors, suitable for properties requiring a dedicated boiler that supplies radiators and hot-water cylinders via an independent system.

Worcester Bosch Greenstar Danesmoor External 25 kW Oil Heat Only Boiler 7731600249 - Price Offer

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Worcester Bosch 25 Kw Boiler