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The fact that Dometic actually makes a plastic holder is itself troubling! These furnaces are a mini version of a condensing type burner found in residential furnaces. They draw in outdoor air for combustion and in the heating process will create condensate. I suspect this is the source of the water and the designers at Dometic didn't incorporate a system to drain it.
It might not help, but certainly can't hurt is a little maintenance on your furnace. Remove the outer cover and check the air inlet and exhaust ports. These are notorious havens for insects that build nests in there during warmer months. Take a shop vac and maybe a bottle brush and clean them out completely. As short as the exhaust tube is, it should be able to push the moisture out before it starts to condense; but if it's partially blocked it might not be able to.
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