I use the proportional dimming mode with my CHE. Apparently the pulse proportional mode is used for metal racks and would illuminate a possible humming sound. On off is good for controlling fans, and (like mentioned above), small heaters or even A/C provided the units are under 500watt peaks. Personally I don't like pushing limits on control devices. It is asking for trouble. Always best to check with the manufacturer to be sure. Dion is really good and I had an answer very quickly when I contacted him with a few questions.

Is there a way to use the oil heaters built in thermostat just to keep a decent ambient and use the herpstat to control your hotspot?