Enjoying the heat output from this heater.  Assembly was straightforward, with all parts fitting together well.  The heating elements seem to be good quality and work well.  Slight angle to the unit requiring shim under one edge, but not sure if this is in vertical or base. After more than about 4 hours of constant use on high, the gas expansion in the propane tank causes it to freeze up.  We'll see if putting the tank in a container of water delays this.  Lighter than I expected, but very stable.