Worcester Bosch Greenstar 8000+ 35kW Gas System Boiler - 7736702591

Worcester Bosch Greenstar 8000+ 35kW Gas System Boiler - 7736702591 The Worcester Bosch Greenstar 8000+ 35kW Gas System Boiler - 7736702591 is a premium Natural Gas condensing system boiler designed for larger homes with substantial central heating and stored hot water requirements. Part of Worcester Bosch's latest Greenstar 8000+ range, the GR8701iW 35 S NG replaces the previous Greenstar 8000 Life generation and introduces an updated modern design, full-colour display, backlit touch controls, rear piping capability and an installer-friendly pre-plumbing jig. With a maximum central heating output of 33.7kW at 80/60°C and up to 35.0kW at 50/30°C, the Greenstar 8000+ 35kW System Boiler provides powerful heating performance for larger properties when correctly sized by a heating professional. As a system boiler, it is designed to work alongside a separate hot water cylinder, making it particularly suitable for homes requiring a stored supply of hot water and the ability to serve multiple hot water outlets. Key Features Latest-generation Worcester Bosch Greenstar 8000+ System Boiler Manufacturer part number: 7736702591 Model: GR8701iW 35 S NG Natural Gas condensing system boiler 35kW model Maximum CH output: 33.7kW at 80/60°C Maximum CH output: 35.0kW at 50/30°C ErP A-rated space heating performance 94% seasonal space heating efficiency Full-colour display Backlit touch controls Rear piping capability Installer-friendly pre-plumbing jig Large condensate siphon 10 litre integrated expansion vessel Integrated heating circulation pump Bosch EasyControl compatible Wireless smart control compatibility Solar compatible Low NOx Class 6 performance Only 5mm side clearance required Wall-mounted internal installation Designed as an easy replacement for selected Worcester CDi Classic installations Up to 12-year guarantee available subject to qualifying Worcester Bosch terms Technical Specification Brand: Worcester Bosch Range: Greenstar 8000+ Model: GR8701iW 35 S NG Product Type: Gas System Boiler Manufacturer Part Number: 7736702591 EAN / GTIN: 4069143014448 Gas Council Number: 41-800-28 Fuel Type: Natural Gas Boiler Type: Condensing System Boiler Rated Heat Output: 34kW Maximum CH Output at 80/60°C: 33.7kW Maximum CH Output at 50/30°C: 35.0kW Maximum CH Output at 40/30°C: 35.2kW Rated Output Adjustment Range at 80/60°C: 16.9 - 33.7kW Heat Input Modulation Range: 5.1 - 34.4kW Maximum Flow Temperature: 70°C standard / up to 82°C possible Maximum Operating Pressure: 2.5 bar ErP Space Heating Class: A Seasonal Space Heating Efficiency: 94% Useful Efficiency at Rated Output: 88.8% Useful Efficiency at 30% Load: 98.8% Sound Power Level: 53dB NOx Class: 6 NOx Emissions at Declared Range Rating: 25mg/kWh Maximum Condensate Rate: 4.1L/h Expansion Vessel Capacity: 10 litres Expansion Vessel Pre-Charge: 0.75 bar Nominal Appliance Water Capacity: 5.2 litres Electrical Supply: 230V AC / 50Hz Maximum Heating Power Consumption: 120W Standby Power Consumption: 1W Protection Rating: IPX4D Mounting: Wall Mounted Installation Location: Internal Colour: White Height: 780mm Width: 440mm Depth: 365mm Appliance Weight: 46kg Lift Weight: 40kg with front and side panels removed Total Packaged Weight: 54kg Designed for Larger Homes The Worcester Bosch Greenstar 8000+ 35kW System Boiler provides up to 33.7kW of central heating output at an 80/60°C flow and return temperature, making it particularly suitable for larger properties and heating systems with higher calculated heat losses. Correct boiler sizing should always be based on a professional room-by-room or whole-property heat-loss calculation rather than simply selecting a boiler by the number of bedrooms or radiators. Ideal for Stored Hot Water Systems Unlike a combination boiler, the Greenstar 8000+ System Boiler works alongside a separate hot water cylinder. This allows a suitably designed system to store a substantial quantity of hot water ready for use around the property. This configuration can be particularly beneficial for larger households where baths, showers and other hot water outlets may be required within a short period. 94% Seasonal Heating Efficiency The Greenstar 8000+ 35kW achieves an ErP A rating and a seasonal space heating efficiency of 94%, helping provide efficient heating performance when correctly installed, commissioned and controlled. Full-Colour Touch Display The updated Greenstar 8000+ features a modern full-colour display with backlit touch buttons, providing clear access to boiler information, settings and diagnostic functions. Smart Heating Compatibility The Greenstar 8000+ is compatible with Bosch EasyControl and selected Worcester Bosch controls, providing options for advanced heating control and wireless smart thermostat functionality. Installer-Friendly Greenstar 8000+ Design Pre-plumbing jig Rear piping capability Large condensate siphon Full-colour diagnostic display Backlit touch controls Accessible internal components 40kg reduced lift weight with casing panels removed Only 5mm side clearance required SimpleSwitch design for easier replacement of selected CDi Classic boilers S Plan & Y Plan Installation Information Important: Worcester Bosch advises that Greenstar 8000+ System Boilers using Worcester Bosch control options without the Greenstar Wiring Centre are not directly compatible with traditional S Plan or Y Plan configurations unless the appropriate optional Worcester Bosch Diverter Valve Kit is fitted. The optional diverter valve kit for the Greenstar 8000+ 30kW and 35kW System Boilers is Worcester Bosch part number 7738112913. The heating engineer should confirm the intended system configuration and required controls before ordering. Guarantee Information The Worcester Bosch Greenstar 8000+ System range carries a standard 8-year manufacturer guarantee. 8 years: Standard qualifying guarantee 10 years: Available with a qualifying Worcester Bosch Greenstar System Filter Up to 12 years: Available on qualifying installations subject to Worcester Bosch installer, loyalty programme, registration and current promotional terms Always check Worcester Bosch's current guarantee conditions at the point of installation. Important Product Information This listing is for the new-generation Worcester Bosch Greenstar 8000+ 35kW Natural Gas System Boiler - 7736702591. This is not the older Greenstar 8000 Life 35kW System Boiler 7738100808. Flue kit, hot water cylinder, system filter, heating controls, wiring centre, diverter valve kit, chemicals, pipework and installation accessories are not included unless specifically stated elsewhere in this listing. Professional Installation Required This Natural Gas boiler must be installed, commissioned and registered by a suitably qualified Gas Safe registered engineer. The installer must confirm the property heat loss, system configuration, cylinder requirements, controls, flue arrangement, water treatment and all required installation accessories before installation.