Baxi System Main Heat Exchanger 4E – Refurbished | Part No. 5122147

When a Baxi system or combi boiler suffers reduced heating efficiency, inconsistent temperatures, or complete heat output failure, the primary heat exchanger is often responsible. The Baxi System Main Heat Exchanger 5122147 – 4 Element is a fully refurbished replacement covering an extensive range of Baxi Duo-Tec ErP, Platinum Combi, 15–24 HE System, Megaflo HE, and System ErP boilers — making it one of the most versatile Baxi heat exchangers available.

This is a fully refurbished Seller-Refurbished unit, fully tested by our technicians before dispatch. Unlike the 5E (5114687) above, this 4-element version is the correct replacement for later-serial and ErP-generation Baxi and associated models.

Compatible Boiler Models

Key Features

• Baxi part number 5122147 — 4-element (4E) primary heat exchanger (different from the 5E 5114687 variant)
• Fully refurbished and tested by our technicians before dispatch
• Covers Baxi Duo-Tec ErP, Platinum Combi HE, 15–24 HE System, Megaflo HE A, and System ErP series
• Resolves reduced heating output and heat exchange failure across later-serial Baxi boilers
• 12-month warranty included

Delivery & Returns

Orders placed before 1:00 PM (Monday–Friday) are dispatched the same working day. Standard and next-day delivery options available at checkout. Next-day orders placed on Fridays arrive Monday — select Saturday delivery at checkout for weekend delivery. Returns accepted within 30 days if unused and in original packaging.

Note: Installation must be carried out by a Gas Safe registered engineer.