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Old 10-14-2015, 06:02 AM   #1
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Isotherm Water Heater Difference SPA vs Basic

Isotherm sells both a SPA (Plastic shell) and a Basic (Stainless) 6.5 gallon water heater. Both have a stainless tank. I don't think the material of the outside shell is important in my installation. Question is does anyone know of any differences between the units that affect performance?

The price difference is $300.
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Old 10-14-2015, 11:12 AM   #2
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We researched and purchased an Isotherm a few years ago for our sailboat. I don't recall any performance differences between the plastic and stainless shells. We opted for stainless, because the tank was located in the cockpit locker where we also stored a lot of equipment.
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Old 10-15-2015, 01:10 PM   #3
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I have the plastic one and it works great. As far as I know there are no performance differences.
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Old 10-15-2015, 06:23 PM   #4
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Called Isotherm. Their tech said they were identical units with just a cover difference. The price differential is a couple of hundred dollars.

Thanks for the comments.
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