Glowworm Ultracom HXI SXI Main Heat Exchanger 801621 15CM – Refurbished

The main heat exchanger in a Glowworm Ultracom or compact HXI/SXI/CXI boiler transfers heat from the burner to the heating and hot water system — and a worn unit results in reduced efficiency, inconsistent temperatures, or complete heating failure. The Glowworm Ultracom HXI SXI Main Heat Exchanger 801621 (15CM) is the direct, compact replacement that restores efficient heat transfer across the compatible Ultracom range.

This professionally refurbished unit is made from durable materials, built to last, and supplied with a full 12-month warranty. Its compact 15CM design fits the following models without modification.

Compatible Boiler Models

Compact Design. Durable. Backed by Warranty.

Improves energy transfer efficiency and helps maintain consistent heat output. Supplied with a full 12-month warranty. Gas Safe engineer installation required.

Delivery & Returns

Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day. Returns accepted within 30 days if unused and in original packaging.

Note: Confirm part number 801621 matches your existing unit before ordering. This is the 15CM variant — a separate 18CM version (801837) is also available. All prices include VAT.