Bests & Worsts Reviews from Amazon

This is a good heater for the money. Easy to install, simple circuitry, heating elements vs. spiral wire, SState thermostat, etc. The elements run about 350 degrees at 5000 watts, and the air flow at the face is around 8.5 mph. I use two of these units to heat a double insulated 2000 sq.ft. metal building with three roll-up doors. They can maintain a temperature difference of between 20 and 30 degrees, which is what I was hoping to accomplish with 34,000 btu’s of heat in a 35,000 cf building. Note that this heater does NOT have a fan circuit that continues circulation when the thermostat cuts off. This is a good thing if you plan on using an external thermostat to cut the power as an off and on control. (Originally, I reported that the overheat circuit allowed the fan to run after shutting off the heating elements. However, that was incorrect. The overheat circuit interrupts power to the elements and the fan motor.) As so many have mentioned here, the fan blades are usually loose when this heater arrives. If they aren’t, they will be. Just assume that you are going to need to treat this as a kit that you are going to have to rebuild. Of the two units I ordered, one spun the fan off within 10 hours of use. So I decided to re-build both. I found that the second one also had a loose fan nut, though it hadn’t yet loosened to the point of dropping off. I also discovered that the unit that spun the fan off was missing a washer. There should be two washers; a notched washer behind the fan, and a standard washer in front of the fan. Mine was missing the standard flat washer. Of course, I didn’t know that until I onpened up and rebuilt the second one. As one reviewer mentioned, the fans are not formed accurately, and you need to make sure that the blade edges are even and track properly. I also found one of the fan blades to be well out of balance. After adjusting the blade pitch and balancing the fans, I reassembled the fan and motor assembly using BLUE locktite, and then remounted everything, again using blue locktite all around. As a final note, I just ordered a third unit to have as a back-up in case one of my units fail. Yes - I will rebuild this one without a second thought. So, overall, this gets five stars for value and utility, minus one star for the fan being assembled poorly. LATEST UPDATE: I purchased a fourth unit for use in my soon-to-be-built shop. I ‘reassembled’ my third unit and found that the fan was completely detached when new in box. This unit didn’t even include any of the fan washers! ( Yes - I searched the box and packing materials thoroughly.) Lucikily, the LHT nut and fan hub were in the unit, and I was able to find one suitable washer in my spare stuff, so I was able to get the heater rebuilt. As for the fourth unit, I found the fan assembly complete but the fan nut was barely finger tight. I easily removed the nut with no tools. I believe it would have spun off within a few hours of use (as one of my two original units did). However, all the parts were there, so I reassembled with blue locktite and all was good... until I found two broken rivets on the access door of the unit! So, two spare machine screws and nuts later, the unit was ready to use. So, in summary, of the four units I received, the fan was completely off of one, the fan spun off of another, the third and fourth had loose fan nuts (with the fourth having two broken rivets as well).