My Mysa feels hot/warm to the touch, is this normal?

Yes. As the Mysa thermostat pulls current to power your heater, the unit itself warms up a little bit. The regular temperature of a thermostat housing normally varies between 35°C and 50°C (95°F and 122°F). So it's perfectly normal for the Mysa to be warm while it's controlling your heating system.

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