Intermatic EH40


Timer, Water Heater

EH40 122495
Average Rating: 2.9
Read Reviews (10) Write a Review
$168.30+ 6 Business Day Shipping $9.10

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Timer, Water Heater


ItemMechanical and Digital Water Heater Timer
Number of Poles2
Contact FormSPST
HP @ 240V1.5 @ 240V
Max. On/Off Cycles42
Min. Time Setting1 Min.
Max. Time Setting6 Days, 23-1/2 Hr., 59 Min.
Length (In.)7.75
Depth (In.)3
Width (In.)5
UPC 078275042902
Weight 3.500000


Mechanical and Digital Water Heater TimersAutomatically turn off water heater at designated times. UL Listed and CSA Certified. Enclosures have lock hasp Digital programmable 4WZ08 features LED and battery backup

Mechanical/Digital Water Heater Timer, Minimum Time Setting 1 Minute, Maximum Time Setting 6 Days 23 1/2 Hours 59 Minutes, Voltage @ 50/60 hz 250 Volts, Power Rating @ 240 VAC 1.5 HP, Maximum Current Rating 30 Amps, Number of Poles 2, Contact Form NO, Day Skipper, Enclosure NEMA 1, Enclosure Type Steel Indoor, Maximum On/Off Cycles 42, Length 7.75 Inches, Width 5 Inches, Depth 3 Inches, With Override

Customer Reviews

Average Product Rating: 2.9
based on 10 reviews

Good Timer

Friday, February 03, 2012

The price is right and Drillspot delivered promptly, but the timer is made in China. I was figuring, hoping, that Intermatic would still be making things in the US. Timer works fine. Programming is straight-forward.

Submitted by notable

Reliability Needs Improvement

Tuesday, September 20, 2011

I've installed two of these EH40 timers. First one works fine. Second one has one of the two relays stuck open. Bought over one year ago, lost receipt. Installation Instructions are marginal - just show "line" and "load" on the unit, so I don't have to figure it out from the relay diagram.

7 day programmability

Install instructions on unit itself. Based on my experience and other reviews, reliability is a problem

Submitted by lbw

Timer Failed Open Circuit

Tuesday, March 29, 2011

My outside line tester showed current, but this was a false reading. I called the water heater company since I lost hot water, but the technican found the EH-40 was the problem. We had to by-pass the timer to restore current to the water heater elements. I will not be replacing this timer since I have lost faith in its ability to perform as advertized. Of course, I can't find the receipt and it is more than one year old. No energy cost savings here after assessing the cost of this unit.

I liked it when it worked, I didn't get two years of service from it

Not fail to deliver current to the water heater

Submitted by Don

Defective in Box

Monday, March 28, 2011

One of these timers was defective

Submitted by walker p

Water Heater Timer

Monday, March 21, 2011

Works fantastic.

Electronic settings with manual override and heavy duty amps

Submitted by DONALD D W

Great Timer For Time of Use Electric Billing

Tuesday, February 15, 2011

This is an easy way to control a water heater for Time of Use billing with the electric supplier. Overall was very easy to set up and install. The wiring diagram is electrically correct, but the jumpers are sized for different terminals to be used for the timer supply.

Ease of programming and having battery backup for the clock and program so that a power outage does not require reprogramming

As with most power companies, we have winter and summer peak hours that are different. It would be great to have two programs that are based on the month so that the program won't have to be changed twice a year

Submitted by Wiseblues

Intermatic EH40

Tuesday, January 04, 2011

I bought the unit to take advantage of off peak electrical pricing. The timer installed without too much effort (Short Jumpers). Programming is easy. Unfortunately it failed 14 months after purchase. One of the poles swiches failed open. It made for a cold shower 1 morning before I could wire around it. I'm looking for a more durable alternative.

Effective while it worked. Kept good time

Please design and build it to last

Submitted by birdog

Good Timer So Far

Sunday, November 28, 2010

I agree with the other reviews that the jumpers are too short and had to make jumper that will fit. Bought this timer because we went to a "Time of Day" rate plan. This timer along with a 8 event per day 7 day thermostat have been saving me $45 average per month on an all electric house. The thermostat and timer, including parts to install them have paid for themselves and then some. The ground screw hole was stripped out when received and Intermatic would not send out a new housing nor an over-sized ground screw. I did need 2 liquid-tite conduits to install the timer. They were $10 each with the 10AWG wires and fittings at the big box hardware/home center. When there is water or any liquid its preferred to use "liquid tight" conduits even though code does not require it. When there is a spray leak on the water line water doesn't get into the conduit as with metal flex. Installed the timer in early March. Because I work in manufacturing, giving Intermatic benefit of doubt that it was just one of those units that had a component that was marginal and couldn't be tested for; the timer just died 8 months later in November over Thanksgiving weekend. Luckily, the timer died with the relay contacts closed. So, I will be using the breaker to shut off the water heater when we don't need the hot water. Sent customer service (Intermatic) a message because there is a 1 year warranty. Lets see if they stand by their warranty. If Intermatic stands by their warranty, then I have no reservations recommending this unit (and day before yesterday I would have). If Intermatic does not honor their warranty, the home center has a no-name brand for under $60. The home center stand by the warranty even if the manufacturer doesn't and they may offer an extended warranty. They did on my washer at a really reasonable price.

Fairly easy to program, really does save money on electric bill

Jumpers are too short, grounding hole stripped out

Submitted by Single Dad

Digital Water Heater Timer

Monday, November 01, 2010

I have now installed two of these on two water heater at two different homes. These are easy to install and work great. I love that I can set multiple on off times for the heater.

The ease to install was great. The number and variation of the timing is great. Very easy to set on/off times

The jumper wires are WAY too short. I had to make own as the ones they give you don't work

Submitted by Jim T

Intermatic Model EH40

Saturday, November 21, 2009

Would not work right out of the box. Also, the wiring directions on the main install does not agree with the wiring diagram with the jumper wires. Not that it made a big difference electrically but the jumper wires were to short when following one set of directions. Unit would never kick on power to the load. Sent an email to the factory, still no reply, called their technical hotline and was on hold for over twenty minutes with no answer.

Ease of Programming

Did not work right out of the box, wiring directions contradict

Submitted by Rick in Ohio
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