A water heating element that takes excess current from your wind generator and uses it to heat water, while at the same time applying resistance to the windgen when the batteries are full.
[Hotwire Enterprises, Tarpon Springs, FL, USA]
Swedish 230-volt electrical water heaters for marine use.
[Indel Marine Srl, Agata, Feltria, Italy]
Rectangular water heaters with stainless steel or less expensive polyvinyl-lined steel tanks, insulated with polyurethane foam, work off engine heat or electricity.
[Atlantic Marine Products Corp., Richmond, VA, USA]
Heat distribution equipment for boats with hydronic heating. These fan heaters direct heat from hot water coils into cabin spaces and onto the windshield.
[Nortec Marine Inc., Seattle, WA, USA]
These water heaters use a heat exchanger with the engine, a 120- or 240-volt electric coil, or both. Ignition protected. Aluminum tanks.
[Seaward Products, Whittier, CA, USA]
Portable 5-gallon water heater uses propane for heat and a rechargeable battery for its pump. Shower head and bulk propane adapter available.
[The Coleman Company, Inc., Wichita, KS, USA]
Systems integrators, dealers and installers of high current alternators, refrigeration, air conditioning, watermakers, bow thrusters, hot water and cabin heaters, and satellite communication systems.
[Great Water, Inc., Brunswick, ME, USA]
Selection of release valves, drains, expansion tanks, tempering (hot/coldmixing) valves, and other safety and installation accessories for hot water installations.
[Watts Regulator Company, North Andover, MA, USA]
Extensive list with good search facility. Covers just about any cruising topic. Tree and branch format for threads.
[The Sailing Company, Middletown, RI, USA]
Unmoderated forum on sail and power cruising. Lots of good advice and other resources, but you have to do some searching.
[Usenet, USA]