Quote Originally Posted by The Serpent Merchant View Post
The Herpstat 1 is slightly safer because of the safety relay, but the proportional control circuit is the same in both models so 99% of the time there would be no difference between them.


The Herpstat basic has 1 less way of preventing a catastrophic thermostat failure.
Can you explain what the safety relay is and what it does? My biggest fear is catastrophic thermostat failure (hence back up t-stats).