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Old 29-10-2015, 12:21   #46
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Re: Heating water without shore power?

Originally Posted by Gerrycooper56 View Post
12 volt heating element in water heater plus 500 watts of solar panels?
Sent from my iPad using Cruisers Sailing Forum

Is not much heat really, especially where he is
at least in this particular case the issue is trying to find a way to heat water less expensively than what shore power costs, and there just isn't any way, from a standpoint of energy, energy off the grid is the most inexpensive energy there is for 99% of people, 1% may have a waterfall in their backyard or something

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Old 30-10-2015, 13:23   #47
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Re: Heating water without shore power?

I've had an on demand propane water heater on one boat which is efficient in regards to propane but used a bit more water since it had to sense water flow before firing up, so the hot water isn't instantaneous. You have to run a bit before the hot water comes in, then you go from freezing to scalding.
My current boat has a generator I run to charge batteries, run refrigeration, make water and is also tied to the water heater so I do all at the same time when it's running. But of course this uses more diesel.
The most efficient was one of my first boats, it had a solar shower bag you laid in the sun to heat up but I guess it wouldn't be too good in northern winters.
Depends on what you can get more easily, water or fuel.

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heating, shore power, water

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