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Old 07-18-2018, 06:34 PM   #1
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Hot water tank

I am shopping for a smallish hot water heater. Some have stainless tanks, some aluminum.

Any opinions on which tank material is to be preferred?


Thanks,
Richard
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Old 07-18-2018, 08:21 PM   #2
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Stainless. Aluminum will probably exceed the US National Drinking Water Standards for aluminum in drinking water. I don’t know the standards in Australia.

I have aluminum fresh-water tanks. I collected an aliquat of water and sent the sample to a certified laboratory for metals analysis. The results for aluminum were quite high.
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Old 07-18-2018, 08:26 PM   #3
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Stainless. Aluminum will probably exceed the US National Drinking Water Standards for aluminum in drinking water. I donít know the standards in Australia.

I have aluminum fresh-water tanks. I collected an aliquat of water and sent the sample to a certified laboratory for metals analysis. The results for aluminum were quite high.
Except that usually you do not really drink water from your heater

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Old 07-19-2018, 12:36 AM   #4
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True! However, it’s still part of the fresh water system.
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Old 07-19-2018, 10:38 AM   #5
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Very pleased with the IsoTemp SPA series of water heaters. Exterior is Poly, tank is Stainless.
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Old 07-19-2018, 04:35 PM   #6
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Thanks for your comments. Kchase, I have just about settled on an Iso Temp Spa.
I think a stainless tank would be a better bet than aluminium - certainly have a better warranty!
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Old 07-19-2018, 06:46 PM   #7
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I have a Raritan water heater with a glass lines steel tank. After 20 years it still works perfectly and the hot water is fine.
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Old 07-19-2018, 09:15 PM   #8
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Very pleased with the IsoTemp SPA series of water heaters. Exterior is Poly, tank is Stainless.
+1, I just installed one of these. So far so good, itís round and lays on its side. Heated by AC and/or the engine. Has an anti-scald valve.
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Old 07-20-2018, 12:21 AM   #9
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Iím a fan of the ISO Temp Spa as well. They come with a mixing valve that lets you set the temperature higher than normally would be safe. The valve mixes cold water with the hot and brings it down to a safe temperature. The effect is you can get more hot water than you would expect from the size of the tank.

I hate aluminum water heaters. They fail quicker than stainless or glass lined tanks and if you ever cut one open, there is a strange snot like substance on the tank walls.

My old company sells them: Isotherm SPA Water Heaters
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Old 07-20-2018, 08:24 AM   #10
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ISO temp spa for all the reasons others have given. Stands up to the demands of a full time liveaboard.
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Old 07-22-2018, 06:35 AM   #11
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Just remember in a pinch the water in the HW tank , may become your drinking water.
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