I'm not sure if this question belongs here or in heating.

My house has electric radiant ceiling heat. Some rooms are on a double 20 amp circuit breaker and some on a 30 amp double breaker. The 20 amp thermostats appear to be single pole and the 30 amp thermostats appear to be double pole. I would like to replace the existing thermostats with modern programmable thermostats. I can't find any modern thermostats rated at more than 16 amps. Can someone please point me in the right direction?

Thank you.