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Old 03-19-2011, 12:52 AM   #1
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208 volt tankless H2O heater on 240 volt circuit?


Can get it really cheap, so looking to find out if I can use it.
Would be used at a low usage sink in my garage workshop.

Chronomite SR-20L 208v Instant-Flow SR Tankless Water Heater

http://www.atanklesslife.com/product...er-Heater.html

thx in advance!
Vince

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Old 03-19-2011, 04:32 AM   #2
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208 volt tankless H2O heater on 240 volt circuit?


I suspect that since the unit is not dual rated 208/240, using 240 on a 208 (15% over-voltage) device will shorten its life. Maybe to the point of instant burn out.

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Old 03-19-2011, 04:58 AM   #3
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208 volt tankless H2O heater on 240 volt circuit?


The product manual shows models with several different voltage ratings, including a separate model for 220/240V. However, it's worth noting that the supposedly-different model for 220/240V has higher rated wattage than the 208V unit - by about the amount one would expect for a 208V unit connected to 230V or so. I think they are the same unit. It will probably work fine.
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Old 03-19-2011, 05:56 AM   #4
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208 volt tankless H2O heater on 240 volt circuit?


Quote:
Originally Posted by mpoulton View Post
The product manual shows models with several different voltage ratings, including a separate model for 220/240V. However, it's worth noting that the supposedly-different model for 220/240V has higher rated wattage than the 208V unit - by about the amount one would expect for a 208V unit connected to 230V or so. I think they are the same unit. It will probably work fine.
IMO, if they were the same unit they would not bother with the inventory control issues of having 2 units. They would have one unit rated 208/240 with a separate wattage listing. You might want to contact the company's customer/technical service for the real answer as we are guessing.
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Old 03-19-2011, 07:48 AM   #5
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208 volt tankless H2O heater on 240 volt circuit?


Quote:
Originally Posted by vsheetz View Post
Can get it really cheap, so looking to find out if I can use it.
Would be used at a low usage sink in my garage workshop.

Chronomite SR-20L 208v Instant-Flow SR Tankless Water Heater

http://www.atanklesslife.com/product...er-Heater.html

thx in advance!
Vince
How cheap is cheap? The link shows all models at $153 which is pretty cheap Have you found one for less than this? If not, just get the right one.
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Old 03-19-2011, 11:17 AM   #6
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208 volt tankless H2O heater on 240 volt circuit?


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Originally Posted by a7ecorsair View Post
How cheap is cheap? The link shows all models at $153 which is pretty cheap Have you found one for less than this? If not, just get the right one.

really cheap... fell off the back of the truck cheap.
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Old 03-19-2011, 11:27 AM   #7
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208 volt tankless H2O heater on 240 volt circuit?


I didn't look into the actual unit but if there are any electronic controls, there may be a problem. If there are electronic controls, you might want to look inside to see if there is a transformer with multiple taps that can be changed to reflect the proper supplied voltage.
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Old 03-19-2011, 11:28 AM   #8
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208 volt tankless H2O heater on 240 volt circuit?


I should not matter anyway. 230 Volts on a 208 element sounds fine to me. But like the others mention, why not just get the right one for your voltage?
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Old 03-19-2011, 12:21 PM   #9
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208 volt tankless H2O heater on 240 volt circuit?


I have ran into this issue before. We received the 208V unit and I was about to hook it up to 240V, but didn't notice a 208/240V rateing. I called the manufactuer and they told me it was dual rated and if i hooked it up the warranty would be void.

I'm with everyone and saying to go by the right unit for your voltage, doesn't seem like there very expensive.
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Old 03-19-2011, 01:18 PM   #10
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208 volt tankless H2O heater on 240 volt circuit?


As to the recurring question of why not just by the one for 240volt - because if I can use this one it's over $100 cheaper. Not a huge amount, but not chump change either...

As to longevity, the usage is very light - a sink in my garage / workshop.

I don't see anything much for controls that are affected by voltage - appears there is basically a flow switch and the heating element.

Thanks everyone for their input.

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