I have bought several of these heaters but different brands.This brand was the best, the quality is better being all metal unit and powder coated with nicer hardware and easier to read intuction manual. The thermostat/ temp control is a simple lit up dial which makes using the unit very simple.Works great and is very efficient and easy to work.Note: make sure you run ground wire all the way to battery terminal, had a small issue with grounding on body of vehicle and couldnt get unit to start up but once grounded to battery runs like a champ!!!!