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Modern marine water heaters work very well, but there are mistakes you can make in choosing one, siting it, and using it safely. This is a good introduction to the features you should consider. Special note on the dangers of gas-fired heaters. 4 pages with photos
[Cruising World, April 2005]
Brief grab bag of facts and commentary to help choose and maintain a water heater. Contains excerpts from hard-to-find bulletin board and newsgroup postings, as well as links to useful sites and vendor pages.
[Bill Dietrich, USA]
One vendor′s installation instructions. Gives a good picture of what is involved in mounting, plumbing, and electrical aspects, as well as consideration of electrolysis prevention in metal-hulled boats. Operation, maintenance, and troubleshooting instructions as well.
[Allcraft Corporation, Franklin, MA, USA]
What to look for in a marine water heater, including efficiency, longevity, installation, and safety variables. 4 pages with photos.
[Cruising World, April 2005]
These tests published in a Norwegian boating magazine prove there are wide differences among water heaters, and cost is no indicator of quality.
[Båtmagasinet, June/July 2004]
Seven 6-gallon storage-type water heaters were plumbed to the same engine and their water temperatures tested during 60 minutes heating and 22 hours cooling. Heat rise and loss was dramatically different among models.
[Practical Sailor, 1 April 2003]
20-liter water heaters are tested by a Norwegian boating magazine, translated and published by Isotherm, one of the companies tested. Tests include heat loss, heating speed, safety thermostat operations, and draining.
[Indel Marine Srl, Agata, Feltria, Italy]
Water heaters with stainless steel tanks, foam insulation, engine heat exchanger and electric heating element. In six sizes from 6 to 20 gallons
[Heat Transfer Products, Inc., East Freetown, MA, USA]
Diesel-fired or 120-volt 5.5-gallon water heater with stainless steel tank for continuous hot water. Can supply heat to a 14,000 BTU space heater as well.
[International Thermal Research Ltd., Richmond, BC, Canada]
Want hot water without starting the engine? If you have a 110-volt outlet and a water faucet hose, these 2.5 and 4 gallon portable water heaters will produce it for you.
[America's Acres, Inc., New Preston, CT, USA]
Calculating Your Electrical Needs
If you are thinking of installing a [small hot water heater], forget it; if you have one, remove it.
Don Casey, Lew Hackler
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