ENERGY EFFICIENCY
A rated · 94%
Published ErP seasonal space-heating efficiency for the Greenstar 4000 25kW and 30kW combi models. Actual household consumption depends on the installation and how it is used.
Technical information ↗THE GAS MAN / Worcester Bosch
Worcester Bosch boilers in Newcastle.
Know your options.
Explore the Greenstar range with clear advice on heating output, hot water and ongoing care. Joe can help assess your existing Worcester Bosch boiler or discuss a suitable replacement.
Talk to Joe
A CLOSER LOOK
Combi boiler
Greenstar 4000 Combi
The Greenstar 4000 combi is offered in 25kW and 30kW hot-water variants. A colour text display and compatibility with Worcester Bosch controls make everyday operation straightforward.
Features worth knowing
Colour display, modulating output and compatible wireless heating controls. The range also includes system models for use with a cylinder.
Manufacturer product information ↗SERVICE INTERVAL
Every year
Arrange an annual service following the manufacturer’s instructions. Keep the service record with your commissioning paperwork to support ongoing warranty cover.
Manufacturer servicing advice ↗GUARANTEE / WARRANTY
7 years standard
Worcester publishes seven years standard, eight with a Greenstar System Filter and up to ten through qualifying installer/loyalty arrangements. Annual servicing and guarantee terms apply. Joe will confirm the cover available with your quotation.
Check cover and conditions ↗Manufacturer information checked 17 October 2026. Specifications and offers can change; the exact model, product code and confirmed quotation determine what is supplied. Product photography: Worcester Bosch.
THE WIDER PICTURE
Other options and existing boilers.
The right size matters more than the biggest number.
A suitable boiler needs to match your home’s heat loss and hot-water demand. Joe can check your existing setup, available space, water supply and controls before recommending an installation. Efficiency labels compare products under defined conditions; they are not a promise of a particular saving on your bill.
How we approach a new boiler installation ↗LOCAL CARE, FROM INSTALLATION ONWARDS
Help with your Worcester Bosch boiler.
Manufacturer warranties cover qualifying defects under their own terms. They do not automatically include annual servicing or every fault in the wider heating system. If your boiler is already under cover, check the manufacturer’s claim process before arranging a chargeable repair.