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Old 03-02-2010, 01:07 PM   #1
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Intermatic EH40 Water Heater Timer


Hello ....... I installed a Intermatic EH40 Water Heater Timer yesterday afternoon and it appears to be working fine. I connected the wires from the breaker box (Black & White 12-2 Wire w/ground) to the 'Line' 1 & 2 Post and the wire going to the Water Heater (Black & White 10-2 w/ground) to 'Load' 1 & 2 Post. The timer powers on and off at the programed times and the red load light on the timer comes on and off to show that it is working. My concern is that during a 16-hour period from 5:00pm last night until 9:00am this morning I used 50 KWH's with the timer installed compared to the night prior I used 29 KWH's without the timer. The weather was the same, the heat pump and other electrical usage was the same. What would or could cause the 72% increase in KWH usage with the timer compared to not having it?

Thanks, I appreciate any help and advise you can provide!
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Old 03-02-2010, 02:02 PM   #2
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Intermatic EH40 Water Heater Timer


Can't answer about the usage.

Most water heaters require a 30 amp 240 volt circuit wired with #10. If you have #12 with a 4500 watt element this would be incorrect.

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Old 03-02-2010, 11:31 PM   #3
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Intermatic EH40 Water Heater Timer


I'm guessing your stated time was when the timer was on and the water was cooled.

It would be hard to guess as lots of variables ( dish washer ran that specific time or electric dryer, hot water for clothes washer, ironing ect.).

I'd be curious as to run what a thirty day run would net you.
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Old 03-03-2010, 04:11 AM   #4
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Intermatic EH40 Water Heater Timer


What "meter" are you using or reading to get these numbers? One connected only to the water heater, or your whole house?

A pointer meter, or digital one?
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Old 05-09-2014, 07:00 PM   #5
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Intermatic EH40 Water Heater Timer


The EH40 is a 240VAC water heater time clock. It doesn't sound like you connected your water heater according to the instructions or the diagram. The terminals are from left to right:
1 - Line 1 (Timer Power - required to energize the relays)
2 - Line 2 (Timer Power - required to energize the relays)
3 - Line 1 (Use a wire nut to split the Line 1 to connect into terminals 1 & 3)
4 - Load 1 (Wire 1 from Water Heater)
5 - Line 2 (Use a wire nut to split the Line 2 to connect into terminals 2 & 5)
6 - Load 2 (Wire 2 from Water Heater)

Line 1 and Line 2 should come from your breaker panel and be 240VAC. You can get a cheap Digital Multi-Meter (DMM) capable of measuring sine-wave household AC from a place such as Walmart. The symbol is usually ~V. Measure the voltage from your two wires, not each to ground, to verify you have 240VAC. It sounds like incorrect wiring and your water heater is always ON.

The 120VAC version of this time clock is the EH10, but has only 4 terminals (only line is switched, neutral is direct wired).

Last edited by RoundedRooster; 05-09-2014 at 07:02 PM.
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Old 05-09-2014, 08:06 PM   #6
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Intermatic EH40 Water Heater Timer


... I don't think the OP from 4 years ago is going to come looking for this answer.
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Old 05-09-2014, 09:14 PM   #7
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Intermatic EH40 Water Heater Timer


Maybe not, but someone doing a web search might be looking for answers and this timer is still made and sold. I joined because I did a web search on something and several links brought me hear, where I looked for answers. Anyway, does it really matter that I replied to an old post?

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