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Use point of use water heater?
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bpboater
#1 Posted : Sunday, November 07, 2010 5:58:03 AM(UTC)
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I need to replace my water heater. Current one is 12 gallon Raritan. Really expensive to buy another Raritan. I plan to replace it with an Ariston (Bosch) GL-8 point of use water heater. It has 7.5 gallons hot water and will fit in the same place as the old heater. Here is a link to the water heater.

http://www.needplumbings...Amazon&NpsRfrMfg=12

Anyone have any comments on using this heater on a Marinette?

Paul
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jsimanella
#2 Posted : Sunday, November 07, 2010 6:18:52 AM(UTC)
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My initial reaction was no because, traditionally, POU water heaters generally don't have reserves, and instead have high-amp heating elements. In this case, yours does (7.5 gal), and it also draws the same amperage as a marine unit, so I guess my new answer is - why not? I would not suspect that you will get much more capacity than a 6-gallon unit...

I have the 11 gallon marine unit from West Marine. Fairly large and hard to get to, where I mounted it. But it does give me a longer shower, especially during the spring.

Yours doesn't appear to have a drain - you will need to consider that when mounting, as well as a means to bypass the unit, during winterization.

Let us know if you go that route - I'm curious.

John

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1987 32 Sedan Bridge
Twin 360s, Rebuilt 2006
Modified/Original Electronic Ignition
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tundrarules
#3 Posted : Sunday, November 07, 2010 8:11:02 AM(UTC)
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My hot water tank is mounted just aft of the gas tank. The only thing that comes to mind...is it ignition proof?

That alone will add a couple of hundred bucks.
1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
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If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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bpboater
#4 Posted : Sunday, November 07, 2010 10:40:05 PM(UTC)
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Good points on the drain. My Raritan does not have a drain either. I need to remove the cold water inlet to drain it.

For ignition proof, the water heater is in the wine cellar, separated from the engine compartment. I don't think the electrical items in this area are sparkproof.

The $200 pricetag just keeps pulling me back to this unit.
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bruegf
#5 Posted : Sunday, November 07, 2010 11:23:40 PM(UTC)
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Take a look at Seaward marine water heaters. They're ignition protected and not much more than the unit you mentioned. While I personally think it won't make much difference in the wine cellar, it does strike me as something a good surveyor would pick on if/when you decide to sell the boat.

Fred
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dougrose
#6 Posted : Monday, November 08, 2010 12:17:19 AM(UTC)
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If you do not have a generator, it is very nice to have hot water from the engine. Some marine hot water heaters have a coil of tubing inside that can carry hot water from the engine, just like the heater in a car. Everybody gets to rinse off with hot at the end of the day.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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cap'n Brent
#7 Posted : Monday, November 08, 2010 9:28:21 PM(UTC)
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Why would you want a hot water heater? Wouldn't you want a cold water heater seems if you had hot water you would not have to heat it more:)
HP Chadwick bay Sunset Bay lake Erie NY boat name Sunrise 32' f/b fisherman chry 318 twin blue bastards,28'express singel 318
"It would be a labor of love, if I loved to labor" cpt Brent
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fastjeff
#8 Posted : Monday, November 08, 2010 11:12:52 PM(UTC)
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Actually, there's no such thing as 'cold'; there's heat, and there's low to high temperatures.

Jeff

PS: There's also no such thing a vacuum, but that's another issue.
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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Barkleydave
#11 Posted : Tuesday, November 09, 2010 12:41:24 AM(UTC)
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If it is a "Marine" water heater like Raritan and has not been molested.. it will be certified and ignition protected.

The problem is termostats! You can go to the hardware store and buy a thermostat that will fit the heater and looks and works fine but... IT WILL NOT BE IGNITION PROTECTED!

I never investigated a boat fire where I was able to isolate the ignition source as the water heater. If there you have any doubt about the unit then replace the termostat with the proper marine rated unit. Oh they cost three times that of an unprotected one but.. lives can be at risk.

Some of the items I have found in engine spaces.

1. Automotive alternators
2. Automotive starters and selinoids
3. Automotive air cleaners
4. Cheap automive battery chargers
5. Residential water heaters and space heaters!
6. PROPANE TANKS!
7. Residential unprotected fans and fan motors
8. AC filiment light bulbs
7. Automotive fuel pumps
8. Automotive Distributors (Not ignition protected)
9. Inverters
10. Various open circuit relays etc.

The list goes on and on!



None
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Barkleydave
#12 Posted : Tuesday, November 09, 2010 12:46:38 AM(UTC)
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I have a simular unit in my kitchen. It does have a drain hose.

THE UNIT IS NOT IGNITION PROTECTED AND SHOULD NEVER BE USED IN IGNITION PROTERCTED AREA SUCH AS ENGINE BILGE !!!
If you installed in the cabin that area is not required to be ignition protected. (Ex. under sink)

dave
None
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cap'n Brent
#9 Posted : Tuesday, November 09, 2010 6:35:50 PM(UTC)
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Fastjeff wrote:
Actually, there's no such thing as 'cold'; there's heat, and there's low to high temperatures.

Jeff.

Do you have dark pumps to make it light old joke from a/c refrigerant class

PS: There's also no such thing a vacuum, but that's another issue
HP Chadwick bay Sunset Bay lake Erie NY boat name Sunrise 32' f/b fisherman chry 318 twin blue bastards,28'express singel 318
"It would be a labor of love, if I loved to labor" cpt Brent
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