The Greenstar 4000 System Boiler is Worcester Bosch's most popular range, combining a modern appearance with reliable performance. It features a stylish design with an LCD full-colour display and is fully compatible with solar panels.

These boilers utilize an aluminium silicon heat exchanger and a top flue outlet. They are designed to work with unvented cylinders for your hot water supply and come with a manufacturer's guarantee of up to 10 years (registration required).

• Available in a wide range of outputs – from 12kW to 24kW in both LPG and Natural Gas
• Modern design – stylish unit with an LCD full-colour display
• Eco-friendly – compatible with solar panels for greener energy
• Durable components – built with an aluminium silicon heat exchanger
• System ready – compatible with unvented cylinders for hot water

• This product should only be installed by a Gas Safe registered engineer.

• Unfortunately due to the nature of the products and for safety reasons, we cannot accept returns on unwanted boilers (your statutory rights are not affected). Please see the website for more details.

This item will be delivered directly by our supplier. Lead times are shown on the product and trolley pages and are always advertised in working days (Monday to Friday).

• If your order contains items stocked by us and items that come direct from the supplier, your order will be automatically split and processed accordingly.
• We will pass the details you give us, including delivery details, your email address and your phone number, to the relevant supplier.
• Most of our suppliers can deliver to any UK address. Delivery to remote or offshore postcodes may take a little longer than the advertised lead time. If the supplier cannot deliver to your postcode or we believe your order may take longer, we will try to tell you beforehand.
• Items that come direct from a supplier will be delivered by the courier chosen by the supplier. Where possible, suppliers will update you with delivery information. This may be by email, phone call or text message.
• Items delivered direct from suppliers cannot be returned through a store. You would need to return these items direct to the supplier, unused and in their original packaging, at your expense. You can arrange for most items to be collected by contacting our Customer Services team. A fee of £9* will be taken off your refund. There is no charge for faulty items being collected. *For big and bulky items, additional charges may apply.
• Please note, you cannot return bespoke or made-to-measure items unless they are faulty.