Vaillant Ecotec Plus 831 12 Plate Heat Exchanger – Refurbished | Part No. 178973

If your Vaillant Ecotec Plus boiler is struggling with inconsistent hot water temperatures or reduced flow, a failing domestic hot water (DHW) plate heat exchanger is a common culprit. The Vaillant Ecotec Plus 831 12 Plate Heat Exchanger (Part No. 178973) is a professionally refurbished direct replacement that restores efficient heat transfer, helping your boiler deliver stable, reliable hot water once more.

Each unit is thoroughly cleaned, tested, and performance-verified before dispatch, offering genuine manufacturer-grade quality at a substantially lower cost than a new component. The 12-plate design provides a precise like-for-like replacement for compatible Vaillant Ecotec Plus 824, 831, and 837 models, fitting without modification.

Compatible Boiler Models

Key Features

• Genuine Vaillant part number 178973 — direct OEM replacement for Ecotec Plus DHW circuit
• 12-plate design for fast and efficient heat exchange to the domestic hot water supply
• Professionally refurbished: cleaned, tested, and performance-verified
• Compatible with Vaillant Ecotec Plus 824, 831, and 837 model variants (2005–2013)
• 12-month warranty included

Why Choose This Refurbished Unit?

Replacing a worn heat exchanger with this refurbished 178973 unit restores optimal DHW delivery and helps improve overall boiler efficiency. Because every unit is cleaned and performance-tested to original Vaillant standards, you benefit from genuine reliability without the premium price of a new component. It is a smart, cost-effective repair option that extends the life of your Vaillant Ecotec Plus boiler.

Delivery & Returns

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

Note: Always verify that part number 178973 matches your existing unit before ordering. Installation must be carried out by a Gas Safe registered engineer.