For your Eberspacher Hydronic S3 D5E CL (CL model with LIN communication), the correct controller options are those specifically designed for LIN-based heaters. The EasyStart 7-Day Timer (Part No. 221000341500) is fully compatible with the Hydronic S3 CL, even though its description often mentions “H-Kit.” In this context, “H-Kit” refers to the older heater types and does not need to be considered for Airtronic S3 and Hydronic S3 heater types.
If you prefer alternative controls, the following LIN-compatible options will also work with your Hydronic S3 CL:
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Eberspacher EasyStart Select (LIN) – simple on/off and temperature control.
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Eberspacher EasyStart Remote+ (LIN) – wireless remote control with extended range.
The EasyStart Pro is not compatible with the CL (LIN) version, as it is designed for CS (CAN-bus) models.
If this controller is for a new installation and you have a requirement for the Easy Start Pro, you will need the Hydronic S3 D5E CS version of heater, [link to 252993050000]
In summary: For your Hydronic S3 D5E CL, choose the EasyStart 7-Day Timer (LIN), EasyStart Select (LIN), or EasyStart Remote+ (LIN) for reliable and fully compatible control.
