Description
Viessmann 7875503 20-Plate Secondary Heat Exchanger
The Viessmann 7875503 is a high-capacity 20-plate secondary heat exchanger, specifically engineered for the 30kW and 35kW versions of the Vitodens 100-W series. This component is responsible for transferring heat from the primary circuit (boiler water) to your domestic tap water. With 20 internal plates, this unit offers a superior surface area, ensuring your boiler can meet high hot water demands without temperature fluctuations.
This 20-plate heat exchanger is verified for use with the following high-output Viessmann appliances:
Viessmann Vitodens 100-W WB1B Series
Vitodens 100-W WB1B 30kW Combi NG
Vitodens 100-W WB1B 35kW Combi NG
Viessmann Vitodens 100-W WB1C Series
Vitodens 100-W WB1C 30kW Combi NG
Why Choose This Product?
This Viessmann DHW 20 plate heat exchanger helps restore strong and consistent hot water performance. Moreover, it supports efficient heat transfer, so your boiler heats water faster and more reliably. If your hot water runs lukewarm or fluctuates, then replacing the heat exchanger often solves the issue. In addition, we offer refurbished and brand new choices, therefore you can balance cost and preference while still getting dependable performance.
Delivery and Return
Orders placed before 1 PM are dispatched on the same working day, so you get your part sooner. Additionally, you can choose standard delivery or next-day courier service at checkout. If you are not fully satisfied, return the item within 30 days in its original condition. Finally, always use a Gas Safe registered engineer for safe installation and correct boiler operation.










