How long can you leave your cummins block heater pluged in?

You can leave your Cummins block heater plugged in for several hours, typically around 2-4 hours before you plan to start your engine. However, it’s generally advisable not to leave it plugged in for extended periods, such as overnight, to avoid overheating or wasting electricity. Always refer to the manufacturer's guidelines for the best practices regarding your specific model.