What about having a self-sufficient boat? You can use solar cells for the power and hot water I suppose?
Yes there are many new possibilities as technology applies to systems. I read about a very smart and simple system for fresh water. Most larger trawlers and cruisers have a hardtop of some sort. A larger hardtop with a lip around the edge can collect a substantial amount of water from rainfall if it's set up right.
So this couple had on their 42 foot boat, 4, 150 gallon stainless steel water tanks built in to the boat. When it rained, four drains on the hardtop allowed for rainwater to be directed to the tanks or over the side should the tanks be full by four hoses. They cruised Australia through Indonesia via the Java Sea and into the South China Sea and up to Thailand. Not even remotely short of fresh water. That's with a couple of showers a day each and the usual fresh water needs. They even helped others out with freshwater who didn't have the storage on their own boats.
A very simple system, that doesn't breakdown and works above expectations.
In the news, a solar powered catamaran just made port in Florida that crossed the Atlantic on solar power alone. At an average of 5 knots an hour, it made it from Spain to the Caribbean and then on to Florida and the only petrol it used was for cooking. No sails, no gas motor just electricity made from sunshine.
This is something I would like to incorporate into my boat. Though with complex systems comes more opportunity for something to breakdown.