Welcome!
Why are there fuses missing? Didn't the survey and purchase process require them to be replaced with the fused items checked for operation? No matter, just curious.
Make an educated guess! I just installed a new horn - a heavy duty 12-volt truck type - that draws a max of 12 amps. I used a 20-amp fuse (15 may have been sufficient).
Check the items you want to fuse for model numbers and research online to find their current draw.
What do you mean, 'replace the water heater?' Is there something wrong with the one you have? Please be as specific as you can with questions and include pictures which almost always help. Posting pictures can be a challenge for those new to this forum software, but there's a guide in the "How to use the Forum," sub forum.
As a new member with a new boat, post pictures of your boat!
Greg.
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