Ariston DHW Heat Exchanger 16 Plates – Refurbished | Part No. 990685

Reduced hot water flow, lukewarm output, or fluctuating temperatures in an Ariston combi boiler are often traced back to a failing domestic hot water plate heat exchanger. When this component becomes worn or internally blocked, it can no longer transfer heat efficiently between circuits — directly impacting how quickly and consistently your taps and showers receive hot water. The Ariston DHW Heat Exchanger, 16 Plates (Part No. 990685) is the refurbished direct replacement, restoring reliable DHW performance across compatible Ariston ACO, Eco Combi, and Intesa boilers.

This 16-plate heat exchanger has been fully refurbished — cleaned, pressure-tested, and quality-checked — before dispatch, delivering proven performance at a significant saving over a new OEM part.

Compatible Boiler Models

OEM Quality. Proven Performance. Backed by Warranty.

Each refurbished Ariston plate heat exchanger in our range is cleaned, pressure-tested, and verified to confirm dependable operation before dispatch. This 990685 unit restores efficient heat transfer and helps resolve the hot water performance issues common to a worn or blocked exchanger. Supplied with a full 12-month warranty, it is a reliable, cost-effective alternative to a new replacement.

Delivery & Returns

Orders placed before 1:00 PM are dispatched the same working day, with standard and next-day delivery available at checkout. Returns are accepted within 30 days, provided the item is unused and in its original packaging.

Note: Please confirm that part number 990685 matches your existing unit and verify your boiler's GC number before ordering. Installation must be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.