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Old 11-28-2009, 09:53 AM   #1
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Hot Water Heater Help


I have a 10 year old A.O. Smith 66 Gal 1400 Watt dual element electric hot water heater. Water out of the fawcet starts off hot but gets cooler as time passes. I first thought the lower element was bad but I'm not sure. I checked the thermostat settings on both elements. Top is set for 130 and lower is set for 140. I can listen and hear water boiling around each element. I measured the voltage across the element terminals and the top measures 240 VAC but the lower only measures 74 VAC. I was going to check continuity across both elements but figured since I can hear water boiling both should be ok. Any ideas? Thanks!

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Old 11-28-2009, 11:09 AM   #2
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Hot Water Heater Help


Quote:
Originally Posted by bruce23 View Post
1400 Watt
?
the top measures 240 VAC but the lower only measures 74 VAC.
?
I was going to check continuity across both elements
Usually the elements are 3kw to 5kw.

Anyway, for continuity, [240^2]/1400w = ~40 ohms and 1400w/240v = ~6A, for each element.

Since current does the heating, it'd be better if you measure current draw with your clamp-on ammeter.


Last edited by Yoyizit; 11-28-2009 at 11:12 AM.
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Old 11-30-2009, 08:22 AM   #3
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Hot Water Heater Help


Thanks. I think the elements are 4kw. I don't have a clamp on meter so I guess I'll move on to check continuity.
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