Info@sparesdirect.ie
02895 434 399
Trustpilot
Worcester
Worcester Bosch Greenstar 8000+ 35kW Gas System Boiler - 7736702591
Worcester
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.
Delivery Times
All our deliveries are made by some of the countries most trusted couriers, including Royal Mail, PacelForce, DHL , Fastway Curriers. For most larger sized deliveries, you will receive a call from the courier an hour before the scheduled delivery time.
Free Delivery
Free delivery when you spend £150+ on all our stocked items, up to the maximum 20kg in weight (UK & Ireland Only) To be eligible for this service, you must place your order before 1pm on the previous day.
Delivery Drop Off
It is important to note that we use external shipping couriers. They are responsible for delivering the item(s) to the kerb-side. They are not responsible for delivering items into your home*.
*Please note, for large orders we advise that you seek assistance from friends or neighbours to assist with moving your order, as often the driver will not be able to assist you. Some items may be delivered on a pallet. It is your responsibility to dispose of the pallet, however, we recommend keeping it for the first 14 days in case you need to return your item(s).
Failed Deliveries
In the unlikely event that delivery is attempted when you are not at home, we will contact you by phone and re-book another time that suits you. Please note, there may be a re-delivery charge added at our discretion, which will be reviewed on a case by case basis.
Direct Deliveries from Distribution Centers
To help you receive your items as quickly as possible, parts of your order may be dispatched directly from a distribution center (Ie) Amazon. If this is the case, you will be contacted directly by them to arrange delivery for the products concerned. Please note, these items will arrive at a different time to products dispatched from our head warehouse. Some distribution centers may take between 2-3 days to deliver items.
Non-Stocked Items
Some items are ordered into our warehouse especially for your orders. This means there may be additional lead times on your order arriving. The estimated delivery time for non-stocked items is 5-7 working days.
For orders that contain a mixture of stock and non-stock items, excluding items delivered directly from distribution centers, we will deliver all items together. We will make you aware of this when we phone or email you to confirm the delivery date. You will be given the option to receive them separately as well, however there may be additional shipping charges.
Shipping Rates
All Orders to the UK & Ireland *ONLY*up to 20kg £150+ is Free
Pallet Rates are priced on application and order... delivery lead times will also vary based on post code.
Returns
Returns are subject too a 50% re-stocking charge.
- Items installed/fitted without professional understanding IE Oftec/SafeGas Registered Installer certificates, invalidate any warranty of said item bought.. This is however is at the companies discretion.
- All products must be inspected within 24hrs. Goods are non-returnable after this period.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Goods including but not limited to printed circuit boards, control boxes, chemicals, hazardous materials, flammable liquids or gases. Please ask if you are unsure if you can return your goods.
Some items are not returnable such as PCB Boards and Boilers if they are opened, There also will be a 25% Handling fee for All Items if accepted for return.
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer unless otherwise instructed by Spares Direct.
There are certain situations where only partial refunds are granted (if applicable):
- Any item not in its original condition, is damaged or missing parts for reasons not due to manufacturer / supplier error.
- Any item that is returned more than 30 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund, please contact us at info@sparesdirect.ie
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@sparesdirect.ie and send your item to: Unit 5 Dargan Industrial Park, 62 Dargan Crescent, Belfast BT3 9JP.
Unwanted goods or Failed deliveries of items bought
If for any reason you order from us and the item has been shipped, but you no longer wish to have the item, the goods should be returned to us at the consumers cost. The price of goods will be refunded upon delivery/inspection (please note carriage cost will NOT be refunded. This also applies to missed deliveries/collection of goods from currier depot.
Shipping
To return your product, you should mail your product to: Unit 5 Dargan Industrial Park, 62 Dargan Crescent, Belfast BT3 9JP.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over £50, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.