Worcester Greenstar 4000 Heat Exchanger C/W Sump – Refurbished | Part No. 8716121449

Reduced heating output, inefficient hot water, or boiler lockouts in a Worcester Greenstar GR4700IW (Greenstar 4000) boiler — across 12s to 30c models in both NG and LPG variants — often trace back to a heat exchanger that's no longer transferring heat from the burner effectively. The Worcester Greenstar 4000 Heat Exchanger Complete With Sump, Part No. 8716121449, is the genuine professionally refurbished replacement that restores reliable heat transfer across this full Greenstar 4000 compatibility range.

This is a fully refurbished genuine Worcester Bosch component — professionally cleaned, inspected, and tested before dispatch. Supplied complete with sump.

Compatible Boiler Models

Complete With Sump. Professionally Tested. Backed by Warranty.

This refurbished 8716121449 heat exchanger (supplied complete with sump) restores reliable boiler operation, resolving heating failures, poor efficiency, and overheating lockouts in the full Greenstar 4000 / GR4700IW range. Supplied with a full 12-month warranty.

Delivery & Returns

Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day. Standard and next-day delivery options available. Returns accepted within 30 days.

Note: Please confirm that part number 8716121449 matches your existing unit before ordering. Installation must be carried out by a Gas Safe registered engineer.