I love this unit. Simple and very effective. I didn't think the app and bluetooth was going to be any use, but in fact I really like it. The app isn't intuitive, but still provides good information and control. The unit starts up quickly and is extremely efficient. We use this to overwinter in an RV and keep our pipes intact and floors warm by heating underneath our RV skirt. We use 1/2 - 3/4 gal of Diesel/night. The electronic display can detach to fit into the area you're heating and it contains the thermostat. I wish the cord for the control was longer, as long as the heater vent would be great.My only tip to users would be to crack open the fuel cap to relieve pressure and not collapse the fuel tank from the suction of the fuel pump.I am going to purchase another unit to have a backup.Edit: The unit is still heating well. I purchased a 12 gallon fuel tank and a length of fuel hose. I removed the stock fuel tank and attached the external fuel tank with the 3’ long fuel line after bleeding out the air. Tightened hose clamps and checked for leaks. Unit runs for a week without refueling and I’m able to stuff the unit completely under the rig. The external fuel tank was purchased from USplastics.com and is the CORRECT type of plastic for diesel. This makes it very convenient to refuel without pulling my RV skirt apart.