Hello, can a on/off push switch be added to the wiring of the Easy Start Pro to provide a secondary position to start the hydronic heater.thanks

Question

Hello, can a on/off push switch be added to the wiring of the Easy Start Pro to provide a secondary position to start the hydronic heater.thanks

This question is related to Eberspacher or Webasto Water Heater On Off Push Switch Kit | E3535.

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Answers (1)

Answered by Butler Technik's Matthew Varlow
Posted 23rd October, 2026 at 16:00 by Matthew Varlow

It is possible to connect the push switch as a secondary switching option on Hydronic S3 heaters combined with the Easy Start Pro Controller. 

You do not connect this directly to the Pro, instead you connect it across the Red (+ve) and Yellow (S+) wires. 

Please see wiring diagram attached. 

When the heater has been switched on via the push swiotch, the easy start pro will say 'operation unavailable' 

If the heater has been started with the Easy Start Pro Controller, you can override the controller by pressing the switch on, and then off, this will shut the heater down. 

 

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