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The one I used is a Temro Zerostart (https://phillipsandtemro.com/wp-content/uploads/2016/11/LIT0014P_series8000_LR.pdf).What is the make of these things?
As an update to this it was -31 ambient this morning. Last night I used a pair of pinch off pliers on my Webasto coolant line to make sure the convection heater didn't backflow through that loop. My windshield was partially defrosted and it was warm enough my glow plugs hardly cycled before starting. I'm pretty happy, but whoever pays the power bill at my office may not be because I'm going to run it all day.Mine works, but not as well as yours. Mounted nice and low, but I think I need a check valve in the lines going to/from my webasto (mounted between block and heater valve) as it seems to be recirculating more in that smaller loop than through the engine.
Still started right up at -30 so I can't complain.
Premature failure because the coolant wont be "drawn up" efficiently and potentially having the heating element not bathed in coolant?Ideally these are mounted much further down, because yours is so high it may suffer a premature burn out.
Try getting it down to where the block drain was.