Yes, this would be compatible with Thermo 90 ST - though there is not a specific circuit daigram available from Webasto for electrical connection. Included is the general wiring diagram, this frost stat is connected tro provide secondary switched power supply at frost imminent temperatures
Will this Frost stat work on a webasto Thermo 90st?
Question
Will this Frost stat work on a webasto Thermo 90st?
This question is related to Webasto and Eberspacher Frost Thermostat froststat Controller | 4111263A.
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Answered by Butler Technik's David Butler
Posted 27th January, 2026 at 10:29 by David Butler