I would not lose any sleep over it. All espresso machines get hot inside. The electronics of the LR, such as they are, are pretty simple and bulletproof. There is no complicated brain box or PID. Mine has been on 24/7 for 3 months. Eventually, I will get around to installing the WiFi timer control thing I purchased. Mine is plumbed in 230V version. If you have a reservoir, and you leave it plugged in continuously, you will need to male sure to check the water level in the reservoir, as this will slowly deplete from boiler evaporative losses through the VB and OPV.