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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > hot water heater
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Topic Review (Newest First)
11-09-2006 11:25 AM
hellosailor I've used solar hot water heat, and if you are someplace with bright sun & don't mind taking your showers after noon instead of in the morning...the "fixed" ones certainly work. I'd expect the plastic "hot water heaters" (black plastic bag that hangs in the sun) for camping use do a reasonable job the same way.

No, you can't use it as a sauna, but the alternative is always to boil a big pot of water and pour it into your shower bucket. Not elegant, but that still works nicely for a "Navy shower".
11-09-2006 10:25 AM
JakeLevi The most economical water heater that I have ever seen was a black coil and tank that sat on the cabin roof and was piped to the sink and head. Even on partly cloudy days it made warm water. He also had a diesel engine heater. This boat also has a wind generator and solar panels.
11-09-2006 10:19 AM
Goodnewsboy Precisiontemp looks like a winner. Their "junior hydronic" heating system gives hot water and cabin heat. I would be inclined to put propane aboard for that.
11-09-2006 10:11 AM
Sailormon6 The Wolters on-demand propane water heater was specifically designed to provide hot water on small sailboats. Gerry Wolters, the inventor, used it first on his own Catalina 22. After it became popular, he sold the company, but I believe the new owners didn't make much of a go of the business. A few years ago, Gerry formed a new company, called Precision Temp Inc., which started making them again, and also started marketing them to RV builders, which significantly enlarged the market for the device. I believe Gerry's water heater is the only device of its type on the market in this country that works well.

I used to sail with Gerry and his wife, Elaine, in those early days, and they were nice folks. You can log on to the Precision Temp website at the following hyperlink:

http://www.precisiontemp.com/
11-09-2006 09:21 AM
sailingdog Bosch probably still makes a similar unit to the one TrueBlue has, but under the Bosch name now.
11-09-2006 09:15 AM
Goodnewsboy Hi firstafair:

I think you have been shown two solutions that don't require running your engine. You simply need to choose your fuel, diesel or propane.
11-09-2006 08:54 AM
TrueBlue
Bill,

We have a Junkers propane hw heater onboard, as originally installed by Nauticat Yachts. It's a direct vented, bulkhead mounted unit in our galley and has been upgraded with all the ABYC safety devices. I have posted here in the past, about the benefits of this system while away from shore power and cannot say enough about how my wife and I love having unlimited, VERY hot water on demand. Our 140 gal hw tank adds to this luxury. I have no issues what-so-ever with this system.





Junkers was a German manufacturer of precision water heaters for decades, until acquired by Bosch a few years ago. Bosch used the Junkers name for a while, but I believe discontinued the name while utilizing the design. The units are very popular in Europe and are used on some high-end boats in the US. A quick Google search led me to this site, but other distributors have them as well:

http://www.go2marine.com/product.do?no=85739F
11-09-2006 08:11 AM
firstafair I can't believe their is nothing out their that heats water for a shower other then engine exchanger, 110 volt dock side. What if I wanted to stay on the hook for a week and did not want to start the main engine every day just to take a shower???
11-09-2006 12:00 AM
Goodnewsboy If you have a diesel engine, you may be better off with something like an Espar heater.

http://www.espar.com/htm/applies/marine.htm

There are other makes from Europe also, but I can't remember the name.

They are pretty neat devices and they can heat your cabin as well if you put in a radiator.
11-08-2006 11:29 PM
SailorMitch I don't think you will find one specifically made for boats anymore. At best you might find one for an RV. There used to be a couple of outfits that made on-demand propane hot water heaters for boats but I think the liability issues drove them out of the market. I think Wolter and Polamar (or some such name?) made them at one time.
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