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[QUOT
Just to add a note: We never leave block heaters on unmonitored unless it's below -25C, and even then someone checks every 4 hours. .[/QUOTE]
Good quality immersion engine heaters are really nothing more than hot water heaters. Does anyone check their hot water heater for the fresh water system every four hours? Maintenance, maintenance. Fortunately I have used mine on this boat for the last 12 years without incident. If they are installed properly they should not air lock. If proper maintenance is performed wires should not come loose, and briitle ones replaced. IMO with a proper breaker in line, engine heaters are like any other 110v electrical system aboard. Just my 2 cents
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