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Does the 20kw generator have water circulated in it from the aqua-hot system to warm up in cold weather?

So it’s generally not a big issue of starting the gens in the cold. Not sure if you are aware, but if you hold the generator start switch in the stop position it should run the glow plugs as well as run the fuel pump to prime the system. If you do this for a minute or so before starting in the cold the gen should fire up fairly easily. It would be nice to preheat the gen but it would be a bit of a project to do the tie in, and I would do as Gordon suggested tie it in with a heat exchanger so that you are not mixing the two coolants.