So I take it yours won't default to a lower temperature once the Ranco turns it back on? Is it a model with a dial-setting for the thermostat?
I picked up an SMAL digital oil heater from Home Depot recently but it only has 70, 75, or 80F settings and I want 78F, since this'll require less energy. (I have UTH's with thermostats on the cages that keep the cage cool-temp at 80-82F). But when the heater is unpowered and then repowered it defaults to the 70F setting. Yours sounds like the ticket...