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Intermatic WH40 Electric Water Heater Timer, Gray

4.2 out of 5 stars 724 customer reviews
| 83 answered questions

List Price: $59.99
Price: $49.37 & FREE Shipping. Details
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208-277V 10,000 Watts
    This fits your .
  • Enter your model number to make sure this fits.
  • Easy to use
  • Convenient external override switch
  • 10,000 watts, 40 amps, 250 volts, 60Hz capacity
  • Steel case for durability
  • Trippers can be set in the morning and evening when you need and use hot water
42 new from $45.50 4 used from $41.47

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$49.37 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Intermatic WH40 Electric Water Heater Timer, Gray
  • +
  • 2 ON and 2 OFF Metal Trippers
Total price: $52.34
Buy the selected items together

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Style: 208-277V 10,000 Watts
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Product Description

Style: 208-277V 10,000 Watts

Product Description

- External override switch - May be able to save if "time of day" rates are used in your area - Heavy duty 40 amp rating - Easy to install - Easy to program - Supply hot water only when you need it - 10,000 watts, 40 amps, 250 volts, 60Hz capacity

From the Manufacturer

This Intermatic "Little Gray Box" electric water heater timer will provide up to 26% savings for your electric water heater. To maximize the savings, the timer should be used to operate one hour in the morning and two hours in the evening, set to turn "ON" one hour in advance of the usage periods. The trippers may be set from 1 to 23 hours. Three sets of trippers are included. It also provides a convenient external override switch. It is easy to use.

Product Information

Style:208-277V 10,000 Watts

Technical Details

Part Number WH40
Item Weight 2.9 pounds
Product Dimensions 5 x 3 x 4.2 inches
Item model number WH40
Size EA
Color Gray
Style 208-277V 10,000 Watts
Wattage 10000 watts
Item Package Quantity 1
Batteries Included? No
Batteries Required? No
Warranty Description Full warranty

Technical Specification

Additional Information

ASIN B00004W4XI
Customer Reviews
4.2 out of 5 stars 724 customer reviews

4.2 out of 5 stars
Best Sellers Rank #21,729 in Home Improvements (See top 100)
#19 in Home Improvement > Rough Plumbing > Water Heaters & Parts > Water Heaters
Shipping Weight 2.9 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available September 8, 2000

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ]

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From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: 208-277V 6,250 Watts
This product is easy to install if you know what you are doing.
You should have some background in electrical ampacity and wiring basics.

I did have to purchase an additional pigtail.(flex tubing with 3 #10 color coded wires, and 1/2 connectors on each end about 5 feet total length)

The heater had the wiring flex tubing direct from the wall to the top of the heater. The additional material was about 10.75 at the local hardware store.

I unhooked the wiring from the heater and wired it to the timer, then wired the new pigtail to where I had disconnected the original wires.

The timer has knockouts on the bottom for either 1/2 or 3/4 inch connectors so if it will accomodate either one. You most likely will have 1/2" connections.

Make sure you turn off the breaker before you start.

The entire process took about an hour total.

The instructions that come with the timer aren't that great, so if you don't know what you are doing, it won't help much.

The timer comes with 3 sets of on/off clips so you can time it on and off 3 times.

We set it at on at 5 am, off at 8 am, then on at 8 pm off at 10 pm.
So the timer is on 5 hours a day and off 19.

We figgure we will save around 25 dollars a month off the electric bill.

So... it will take at least 2 months to pay for the timer and other materials we bought. If you pay someone to install it, it will take much longer to pay for itself.

So far, it is working properly and so I am satisfied.
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Style Name: 240V 7,200 Watts
Bought this model of timer about 3 years ago. It has failed. It is easy to install and use but the main power relay coil has failed and I can't repair it so I must order another one.
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Style Name: 208-277V 6,250 Watts Verified Purchase
Having purchased 3 of these units over the years I feel qualified to comment on their performance. The first one failed after 3 years - the clock mechanism still turned but the switches did not operate. I purchased a second unit as I did not want to install a new box & wiring. The box mounts to the wall first then the mechanism is installed inside. I only replaced the mechanism. This lasted for 2 years before the clock mechanism stopped turning. (I should have kept the first dead one.) Again I purchased another unit as wanted a simple fix & I will not be in this house for much longer. This last unit only lasted 2 weeks before the switches stopped operating. I did not want the hassle of dismounting & returning it so I stripped down both units & made good one out of the 2.
The mechanism is very old school & has not changed in years. The clock mechanism becomes very hot from being driven 24 hours/day. I does not appear to be adequate to drive the system contimually. I would recommend purchasing a modern electronic system.
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Style Name: 240V 7,200 Watts Verified Purchase
Ever take one of those energy self-audits? Mine had high marks for the easy things- insulation, updated windows, weather stripping, etc. But my water heater- I cannot install the 'tankless', because I have no chimney. It has always been electric, but keeping 55 gallons hot all 24 hours is not efficient. So I ordered the Intermatic, and once installed outside the breaker panel, found it to be as easy to operate as a setback thermostat.
You can set it to heat up prior to morning showers, then (on weekdays) turn the power off, and heat up again in time for evening meals, cleaning, etc. Weekends can be an entirely different schedule. There is even a 'shutoff' feature to bypass the schedule while you take vacation. Instructions are clear, and programmed from the front.
I feel this is saving money (and more still when we get Time-of-Day pricing).
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Style Name: 208-277V 10,000 Watts Verified Purchase
The "Little Grey Box" (as it's called) arrived in perfect condition and was shipped on time. Installation was easy and it works as advertised. It came with "time pointers" enough for three settings instead of the two as advertised. (Bonus!) However; for my purposes I will only be using one on-off time. I am not an electrician and installation was easy with the right tools, plyers, screwdrivers, wire cutter and a proper wire-stipper. BUT BE ADVISED! Working around electricity scares me, especially 220. I made sure the breaker for the hotwater heater was off... And everytime I walked away to get or do something, or take a break, (I took my time with this), before starting the work again, I would check the breaker again to make sure it was off.
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Style Name: 240V 7,200 Watts Verified Purchase
This one worked fine but crapped out after 18 months (warranty only good for 1 year) At $62 a unit, it's questionable whether I broke even on electricity savings. A disappointment.
Updated Review:
I feel obligated to update my rating from two stars to four. The company's support was outstanding and I bought a replacement. I must admit the the first unit worked perfectly until it malfunctioned and my new unit is just humming along. I'm a satisfied camper.
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Style Name: 208-277V 10,000 Watts Verified Purchase
Easy to put on a wall, easy to hook up, doesn't make a sound. Important, when you take the insides out to mount, this is done by depressing the spring clip on top, and lift and pull out. Reassembly is reverse, but you have to make sure the side/bottom edges are behind the stops. If your not back and down all the way, the insides will seem loose and the timer will/could make noise, has you may read about in other reviews.
Our timer has not been mounted and running long enough to figure the savings, ours is set to run two hours in the morning and two hours in the evening. Our water heater, stays hot all day, every time we use water we got hot water all day and night when it is off mode. I am sure this will show great savings!!
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