Not positive but I bet the OP's old ceramic heater was rated at 1500 watts when set on high. The same is probably true for the newer heater that the OP is looking at. As said, it will run on a 30 amp circuit. A person just has to be careful not to turn too much other stuff on at the same time.
Gary mentioned the thermostat on the heater,, Yes, wife had the microwave going when the thermostat on the heater called for heat. Those 2 things, along with probably the 450 watt water heating element cycling on at the wrong time, caused the circuit breaker to trip. You just have to be mindful of what all's running.
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E