Would it be possible to design a wireless switch for a 240V baseboard heater similar to the Honeywell Econnect? And also integrate the power monitoring like on the POW2? I think something like this would work nicely with the Sonoff SC, or even something smaller, that could just monitor temp and humidity. Not exactly a feature request, more of a product request... :)
Could you not just get TH16 with the SI7021 sensor to control the baseboard? The max wattage is 3500W for TH16 so as long as you stay below it, it should be fine.