Glowworm Ultracom HXI SXI Main Heat Exchanger – Refurbished | Part No. 801621 (15cm)

Heating inefficiency, insufficient hot water, or boiler overheating across the Glowworm 24CXI, 12–18HXI, 18SXI, or Ultracom CX/CXI/HXI/SXI range is often caused by a primary heat exchanger that's no longer transferring heat from the burner effectively. The Glowworm Ultracom HXI SXI Main Heat Exchanger, Part No. 801621 (15cm), is the genuine refurbished replacement that restores that transfer, improving energy efficiency and boiler reliability across this wide compatibility range.

This is a fully refurbished unit, made from durable materials for long-lasting performance, cleaned, inspected, and tested before dispatch. Also compatible with selected Betacom 3, Flexicom, and Ultracom 2 models using the same part number.

Compatible Boiler Models

Durable Construction. Improved Efficiency. Backed by Warranty.

This refurbished 801621 heat exchanger restores reliable heat transfer and improves energy efficiency, helping reduce heating bills while resolving performance issues. 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 801621 matches your existing unit before ordering. Installation must be carried out by a qualified heating engineer to ensure safety and warranty validity.