Received new after long wait because of backorder. Once received the startup was easy and the heater was putting ample heat. Installed APP "AirHeaterCC" that was problematic at first but eventually installed. However, once running with the heater working the APP disconnected. After reconnecting it lasted only a few minutes then disconnected. Contacted support and after several contacts I was informed that the APp could only remain connectedvfor a few minutes. After additional complaints and discussions Support agreed to modify the APP so that the heater could be continously monitored by the APP. Once that was fixed I have been totally satisfied with the heater and the APP.