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Old 05-05-2011, 10:01   #16
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Location: NY, USA
Boat: Pearson 424, 42' - Kismet
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I bought a precision temp also last year- made for boats, constant hot water (you do have to run it for 5 seconds or so but its very fast.). Lasts a long time on a tank of LP. Water is nice and hot. It's wired to the LP gas switch so it's on when the LP solenoids are powered up (I have a separate unit to actually open the solenoids). There's a sniffer under the unit to shut off all the gas should anything leak out.

The unit started up great after spending a cold winter unused in new york with antifreeze in it.

Pricey but a great way to go if you can swing it.


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Old 05-05-2011, 11:07   #17
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Re: Propane Water Heater

I have a Rinnai propane water heater that was factory fitted to my boat (in conjunction with a typical 120V/heat exchanger water heater). I believe it is the original unit (1994) and it is still in perfect working order. It does have an overhead vent (and an overhead hatch right next to that) and I turn the unit and the propane on and off before and after each use (easy as it is mounted in the galley and services only the galley and shower/tub room, which is just forward of the galley). The standard water heater is used in the head compartments that are in the other hull.

Apart from being reliable (obviously), there is a tremendous advantage in being able to shower and wash dishes when underway/on the hook without starting up the diesels. Safety has never been a concern to me.


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Old 11-05-2013, 18:19   #18
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Re: Propane Water Heater for on demand use

35 years ago I used a miniaturized propane fired on demand hot water heater on a Bill Tripp designed 23 net ton aluminum trans-atlantic yawl named Doric. This vessel was built by Abeking and Rasmussen in Germany, and was extremely strong and a delight to sail. The hot water heater had a thermo-mechanical switch to control the gas, and the pilot was only lit when the user wished to rig for on demand hot water. It was a small unit mounted over the galley sink, and it vented through the overhead, and out through a flat topped chrome chimney that could easily be secured with a few quick turns of the low profile threaded chrome chimney top on top of the clam shell deckhouse. I may have to re-create this on demand hot water heater for my own yawl which is now undergoing reconstruction. RFP's and solicitations would be greatly appreciated. Matt Twomey, May, 2013
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Old 12-05-2013, 05:16   #19
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Re: Propane Water Heater

I don't think that would meet the ABYC specifications for propane installation and appliances on a boat. You may or may not care about this, but propane can be pretty dangerous on a boat if not installed and operated in a safe way.

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