The Stiebel Eltron electrical assembly “Electronic IWS II / IW – part no. 287820” is a replacement electronic control module used in several Stiebel Eltron instantaneous water heaters (IWS / IW series).

The essential point: it’s the main electronic control board that manages heating, flow detection, and safety functions, and it is sold as an OEM spare part through specialist heating‑equipment distributors.

• Stiebel Eltron 287820 — OEM electronic control assembly for IWS II and IW series instantaneous water heaters.

• Controls heating output, temperature regulation, flow monitoring, and internal safety logic.

• Typically installed inside the main housing behind the front cover.

Compatibility

This module is used in multiple IWS II and IW instantaneous water heater variants.