Can I install Mysa on a 30 Amp breaker?

The short answer is no. Mysa is rated, tested, and certified for controlling up to 16 Amps and can only be installed on a 20 Amp circuit breaker. If installed on a 30 Amp breaker, the thermostat could somehow get overloaded, or the heater could malfunction and draw more than 20A and ultimately result in device failure or damage.

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