Mine is completely different than most on the market. The local shop has one of the HF ones, and won't use it anymore. He says it's a real pain in the butt to keep clean.
Mine is made in Walla Walla,Wash so no freight, and it's designed by farmers!
It has a variable speed pump for the oil, and a variable speed blower for cumbustion air, plus a 3 speed blower for the warm air.
I've been around a few waste oil heaters, and I wouldn't trade any of them for the one I bought, and it even works with waste veggie oil.................