Model # WH40DL3

Internet #203557614

Store SKU #700794

Intermatic 40-Amp 240-Volt Electric Water Heater Time Switch
0078275123878

Intermatic

40-Amp 240-Volt Electric Water Heater Time Switch

  • Convenient external override switch
  • NEMA 1 rated indoor steel enclosure
  • Residential, commercial, industrial, military,school applications
$54.00 /each

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Product Overview

The WH40 Mechanical Water Heater Time Switch regulates electric water heaters. Utilities in many areas of the country offer two electric rates for residential or commercial customers. One rate has the regular daytime rate, the other is the 'off-peak' rate. This 'off-peak' rate provides customers with lower priced electricity during the nighttime and weekend periods. This time switch allows the customer to shift electricity use into the 'off-peak' time periods in an attempt to save utility costs.

  • Double pole, single throw
  • Convenient external override switch
  • NEMA 1 rated indoor steel enclosure
  • CSA listed
  • For use in residential, commercial, industrial, military, and school applications
  • Additional sets of trippers are available - #156T1978A

Info & Guides

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Customer Questions & Answers

9 Questions23 Answers

Customer Questions & Answers

40-Amp 240-Volt Electric Water Heater Time Switch
40-Amp 240-Volt Electric Water Heater Time Switch

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5 answers

wire melting?

This question is from 40-Amp 240-Volt Electric Water Heater Time Switch
Asked by
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January 20, 2016
I have had two of these at two different residences and after 5+ years of service the wires have melted at the connection terminals inside the gray box.
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Asked by
Kelseyville, ca
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October 13, 2016
Answer: 
Your wires should never melt. The only cause I can think of would be if you used a #14 wire and ran more than 15 amps thru it (same for #12 and 20A or #10 and 30A) What wire size are you using and what circuit breaker size?
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Asked by
Cape Coral, Fl
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Home Improvement Profile: DIYer
March 23, 2016
Answer: 
If the wires are NOT tightened down fully, they will get hot and can melt wires...
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Asked by
Tacoma, WA
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Home Improvement Profile: DIYer
March 5, 2016
Answer: 
In addition to the excellent advice of the others I'd suggest keeping the insulation off of the metal terminals per instructions. I"m glad you asked this. I just installed this timer and I will definately check the terminal screw tightness from time to time. BTW I asked the Home Depot plumbing guy about these and he didn't know what I was talking about. I found a few different kinds in with the timers Read More
In addition to the excellent advice of the others I'd suggest keeping the insulation off of the metal terminals per instructions. I"m glad you asked this. I just installed this timer and I will definately check the terminal screw tightness from time to time. BTW I asked the Home Depot plumbing guy about these and he didn't know what I was talking about. I found a few different kinds in with the timers but I suggest that The Home Depot stock a couple near the water heaters. I'd have bought one long ago if I'd have seen it there. I buy things like that on impulse. Just a suggestion. Thanks for having such a great money saving product in stock! Read Less
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Asked by
Arizona
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Home Improvement Profile: Professional
February 23, 2016
Answer: 
Do you know the gauge of the wire being used? It may be insufficient for the load ! I would recommend 10-12 gauge solid wire. Is the product being used for the recommended purpose and not exceeding the manufactures current rating?
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January 21, 2016
Answer: 
This is most likely an indication of loosened connections which can result from thermal cycling over time, from mixing solid and stranded wires under the same terminal, from placing two wires under one side of a screw clamp (which tilts the clamp and allows it to loosen), or insufficient tightening of the terminal screw. Connections should be checked and retightened periodically.
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5 answers

Is this timer a plug in style? Can this timer be used on a recirculating hot water heater pump

This question is from 40-Amp 240-Volt Electric Water Heater Time Switch
Asked by
Kerrville Texas
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December 3, 2014
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Asked by
Cape Coral, Fl
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March 23, 2016
Answer: 
The unit itself does not have a plug. Purchase the correct plug (220) and wire it into the unit. Then wire the unit to the water heater.
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Asked by
Lake Ariel, PA
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June 9, 2015
Answer: 
This is not a plug-in style. It needs to be hard-wired to the 220V circuit breaker for your hot water heater. Yes, it can be used with a recirculating hot water heater pump but I would not recommend it. You will not save any electricity by connecting to a heat pump hot water set-up.
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January 6, 2015
Answer: 
Dear Valued HomeDepot Customer,
We reached out to the MFG for more information and below is their response.
"No, this timer is only meant to be hardwired and is not a portable unit."
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December 29, 2014
Answer: 
Dear Valued HomeDepot Customer,
We reached out to the MFG for more information and below is their response.
"We would be happy to talk directly with you to determine the correct timer to use for your specific application. Please call our Technical Support department at 815-675-2321, Thanks you"
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December 5, 2014
Answer: 
Dear Valued HomeDepot Customer,
We reached out to the MFG for more information and below is their response.
"The WH40DL3 is not a plug-in timer. It is hardwired. A better choice for your heater pump application would be the TN311K as it has a 1Hp rating."
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2 answers

is there any point to having this with a gas heater?

This question is from 40-Amp 240-Volt Electric Water Heater Time Switch
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October 24, 2016
This timer was already installed in my house when I bought it, but I'm confused about why because it's a gas water heater, not electric.
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Asked by
Kelseyville, ca
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October 24, 2016
Answer: 
No point with most gas heaters. Gas heaters use a thermopile which generates electricity for the heater to run its sensors and switches. So they usually don't have electrical connections. If yours does, it is something I am not familiar with.
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October 24, 2016
Answer: 
Hello, there could have been an electric one at another time. If you have any questions please call us at 815-675-7000 and speak with a technician. Thank you!
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2 answers

is the manual lever in on or off position for the automatic times to work

This question is from 40-Amp 240-Volt Electric Water Heater Time Switch
Asked by
new york
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October 13, 2016
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Asked by
Ephrata, Pa.
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October 14, 2016
Answer: 
Hello Habib ! The lever will be in both spots throughout any given day. As the timer wheel moves through it's 24 hour cycle, the lever will move to the on position during the time set for it to turn on, and will then move to the off position as the wheel moves into a period which it is to be off. You can also turn your water heater on manually at any time during the day if additional heating is desired. Read More
Hello Habib ! The lever will be in both spots throughout any given day. As the timer wheel moves through it's 24 hour cycle, the lever will move to the on position during the time set for it to turn on, and will then move to the off position as the wheel moves into a period which it is to be off. You can also turn your water heater on manually at any time during the day if additional heating is desired. The heater will then be turned off once the timer reaches the time of day to be off, or you can manually turn it off if you desire. It will then return to heating again at the set time to turn on. Read Less
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Asked by
Kelseyville, ca
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October 13, 2016
Answer: 
The manual lever has no seperate control. It is just an extension of the on/off switching that is controlled by the switches on the clock face. If the unit is off, turning it on via manual will then leave it on while the auto-on switch engages and will stay on til the auto-off switch engages. Same for the off. If it is currently on then turning it off via the manual switch will leave it off until the Read More
The manual lever has no seperate control. It is just an extension of the on/off switching that is controlled by the switches on the clock face. If the unit is off, turning it on via manual will then leave it on while the auto-on switch engages and will stay on til the auto-off switch engages. Same for the off. If it is currently on then turning it off via the manual switch will leave it off until the next auto-on switch is reached. Read Less
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Customer Reviews

Rated 4.3 out of 5 by 36 reviewers.
Rated 5.0 out of 5.0 by Bought as replacement for identical timer that worked reliably for 20 years I bought 2 of these about 20 years ago to control swimming pool pumps. One of them has just died. The switch still works, but the clock motor quit. I was very glad to find that the exact same product is still available. If this new one is half as good as the old ones, I'll be satisfied. October 29, 2016
Rated 5.0 out of 5.0 by Energy savings Easy installation. Installed for energy savings. Easy to set up for the homeowner's schedule. September 20, 2016
Rated 4.0 out of 5.0 by Works Fine I had several electronic timers before that all died. So I went back to mechanical. This one does the job and has several on off switches which is what I wanted. The instructions were a bit confusing at first. I ordered for 240V and the first page only shows 208/277. But further in it does show for 240. September 14, 2016
Rated 4.0 out of 5.0 by Good product Ours worked flawlessly for about 10 years. Today I have to replace it because one of the contacts is burned and does not make a connection. Much more than paid for itself in electricity savings. September 4, 2016
Rated 5.0 out of 5.0 by The best energy saver ever This timer was easy to install,compact ,it is easy to program for all times of use during the night and day,I have had these timers before and they last several years.i would highly recommend these timers to anybody who would like to save money on their energy bill and there is no maintenance on these timers. June 8, 2016
Rated 5.0 out of 5.0 by Direct Replacement The labeling was accurate and complete. The diagrams were large and easy to follow. The timer was the direct replacement , mounting holes and knockouts were the correct size. April 26, 2016
Rated 4.0 out of 5.0 by Good timer, got noisy after approx 2 yars Easy assembly and hook up. It was very, very quiet up until last week, about 2 years old. I started looking for a new drive motor but couldn't find one. I ended up, pulling the unit apart (one spring clip at the top, inside) and spray the moving gears with lithium spray grease. That made the unit nice and quiet again!!! March 23, 2016
Rated 5.0 out of 5.0 by Great product Was perfect for the application. Straight forward installation. May require additional conduit and wire. Electrical knowledge a must, especially if additional wiring is required. February 23, 2016
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