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Old 12-04-2010, 12:20 AM   #16
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The issue you will run into it is the way the majtory of resdentail water heaters they use single pole thermosat on both beside the upper unit it will have SPDT upper thermosat so when the tank is cold it will run upper thermosat until it get warm then switch over to lower element that where pretty good percentage of time of element running.

that why I mention current transfomer reading so it will read the current instead of voltage which plain jane hourmeter will read.

Very rare to see any resdential water heater have legit double pole thermosat for both upper and lower elements.

Merci.
Marc

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Old 12-04-2010, 11:09 AM   #17
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Thanks French.

Not sure I completely understand what your saying. But I am finding that the upper element is not running nearly as much as I thought it would. Apparently, the lower element does most of the work.

I'll find out when I switch the meter over the the lower element.
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Old 12-04-2010, 11:28 AM   #18
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The lower element heats 90% of your hot water needs.

The upper element rarely will come on, only when most of your hot water supply has been depleted.

A watt-hour meter would be better to use to determine the exact usage of an appliance.

Here is a kit on ebaY that includes both a meter and a socket.
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Old 12-04-2010, 01:01 PM   #19
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Thanks sparky. I wish I had seen that a couple of weeks ago.

It's not much more that what I paid for my little meter.

Oh well, you live and learn.

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