I am curious about your water tanks. Where are they located? Four of ours are under the cabin sole and one is under the saloon. While the one under the saloon could heat up to room/boat temp, I imagine the ones below the waterline should stay at water temp or close to it. Right now our water temp is about 85 degrees. Wouldn't this keep those tanks closure to that temp vs air temp? Additionally, our tanks are all vented, although there is one that is being rather fussy about this and this makes it harder to draw on then any of the others, we also have an overflow that leads to the head. Any overflow ends up in the head sump pump.
I do appreciate the heads up and will make a point to mention it to the Captain this evening.