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Old 08-10-2012, 10:53   #1
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dowsize water heater?

Please advise: my Force 10 11-gallon water heater has begun to leak despite the fact that it's only six years old. The locker in which the heater fits is an inch too short to fit the Isotemp 11-gallon heater. I'm tempted to go with a smaller, 6.4 gallon Isotemp Basic 24 heater.

Or would it be better just to replace the 11-gallon Force 10, which is less than half the price of the Isotemp?
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Old 08-10-2012, 10:57   #2
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Re: dowsize water heater?

what a drag!

I am getting ready to install a tiny on-demand myself, no space for a tank heater on the Cal. While considering options I saw this thread;

Best Marine Electric Water Heater?

Might be useful!
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Old 08-10-2012, 10:58   #3
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Re: dowsize water heater?

What size family? Basically, for two I've been fine with 6 gallon. lasts for end of the day (after motoring) kitchen cleanup and still warm enough for a short shower in the am usually. But I can be a water miser at times too. I've had the basic (non-isotemp) units last over a decade. Sounds like you had bad luck on yours. I would be tempted to just replace with like kind. It seems looking at the other thread, that maybe a Force 10 is not the best unit. The standard taiwanese (?) ones seem pretty good!
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Old 08-10-2012, 11:03   #4
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Re: dowsize water heater?

My 6 gallon force 10 heater leaked after 5 years. That appears to be the life of cheepie (ok not that cheep) water heaters.

The Isotherm looks to be constructed with much better materials and insulation so should last far longer.

If you get the force 10 heater, just plan on replacing it again in 5-6 years..
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Old 08-10-2012, 11:05   #5
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Re: dowsize water heater?

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What size family?
There are two of us. On the previous boat, we were just fine with a 6-gallon unit. We were careful, however, not to shower and wash dishes at the same time. With the 11-gallon tank, there have never been worries.
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Old 08-10-2012, 11:11   #6
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Re: dowsize water heater?

I think Seaward is the brand I had pretty good luck with. available 6 or 11 gal.
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Old 08-10-2012, 11:17   #7
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Re: dowsize water heater?

We have a 6 or 6.5 gallon water heater and it is definitely sufficient for us. No need to waste energy heating almost twice as much water.
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Old 08-10-2012, 11:25   #8
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Re: dowsize water heater?

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We were careful, however, not to shower and wash dishes at the same time. With the 11-gallon tank, there have never been worries.
Just curious...why? If you dishes first then shower, you use the same amount of hot water. Unless your fresh water pump can't handle two faucets at the same time (and most can), I don't understand.
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Old 08-10-2012, 11:27   #9
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Re: dowsize water heater?

We have a six gallon Seaward, works just fine for the two of us on cruises, just time your uses for when you do have hot water. Maybe the morning shower has to be delayed until you motor enough to heat water the next day. When elec is available, not an issue.
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Old 08-10-2012, 11:28   #10
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Re: dowsize water heater?

Get the smaller one. The Force 10 water heater is not the best. I ordered one years ago and returned it.
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Old 08-10-2012, 11:34   #11
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Re: dowsize water heater?

You guys are fancy. No water heater here. Actually we had one that was engine driven but ripped it out and plugged the holes.
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Old 08-10-2012, 11:36   #12
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Re: dowsize water heater?

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You guys are fancy. No water heater here. Actually we had one that was engine driven but ripped it out and plugged the holes.
HA, I tossed my leaky one and now use a solar shower or heat the water on the stove.
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Old 08-10-2012, 11:42   #13
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Re: dowsize water heater?

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Originally Posted by Stu Jackson View Post
Just curious...why? If you dishes first then shower, you use the same amount of hot water. Unless your fresh water pump can't handle two faucets at the same time (and most can), I don't understand.
When you are done motoring there is 6 gal of hot water in the tank. As you are using that water, fresh water is pumped into the hot water tank diluting the the hot water. At the end of the pump out, the water may become luke warm.
I seldom used the heater at the dock (except when I was living aboard and working of course) but I really like the engine heated hot water feature. When you get somewhere wind whipped and tired. It's ready to use. If you run the engine to charge the batteries... hot water is ready.
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Old 08-10-2012, 14:48   #14
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Re: dowsize water heater?

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HA, I tossed my leaky one and now use a solar shower or heat the water on the stove.
That's what we do. Disk dishes are fine at "normal" temperature, and showers are either the sun or the stove. Not too bad.
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Old 08-10-2012, 14:57   #15
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It was 31 degrees F this morning. Had no problem taking a nice hot shower. Have a six gallon tank and it has never let the two of us with out hot water.(110v) running from engine you need to be careful that it does not get too hot. Need to use on off button on shower.
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