A little late to reply, But I also use a many years old Delonghi oil filled heater,it has a knob dial not a digital thermostat, and I have a Herpstat HP thermostat (they are not on the website anymore).
In a maybe 10x12 room, I can keep it set on the 600w setting (it has 3 settings). It keep the room at 76* to 78* no problem.
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