Questions and Answers for Intermatic 40-Amp 240-Volt Electric Water Heater Time Switch

A:  Hello. This is Bob with Intermatic Technical Support. We appreciate your inquiry. This timer is only designed for 240V. For 120V you can use an EH10. If you have any other questions, you can call us at 815-675-7000 or email us at techsupport@intermatic.com.

A:  No. The number on my times is 124T1952-1

A:  I doubt it. I have the little gray box it's takes 220 into the box 220 out to the heater. However someone may know better so don't take my word for it. Richard

A:  Yes, but you can buy a single pole (110 V version) which is less expensive. Be sure the current rating is sufficient for your appliance.

A:  Yes.

A:  Yes. The clock needs a neutral wire for it to work when the power output is turned off.

A:  Check with an electrician, also read the instruction in the installation that came with the water heater timer switch.

A:  You have two 120 V phases of power in your house. The circuit breakers in a residential panel alternate phases, which are a half cycle out of sync with each other. A 240 V breaker takes up two slots in the panel, taking a hot from each phase. Since the two phases oppose each other the resulting emf [electromotive force] is 240 V. 240 V circuits do not use a neutral wire. They do use a ground wire, to insure that the case of the device is at ground potential, protecting from exposure to high voltage (any voltage over 50 V is considered high voltage). However, the clock motor in this device runs on 120 V, single phase. So, the neutral line is needed for the clock to run. Do not connect the ground wire (usually green, or bare copper) to where the neutral is supposed to go. That would create a ground fault. Follow the wiring diagram in the instructions. If you do not understand this stuff, you would be well served to consult with a licensed electrician.

A:  There is no need for a neutral w/ this timer - the motor running the clock is a 240VAC device. Sounds like you have the source and load connections backwards. Source (from break panel) is supposed to be connected to screws 1 & 3 - Load is on 2 & 4. See wiring diagram here: https://www.intermatic.com/-/media/inriver/7293-8775.ashx/WH40-Specifications-EN

A:  Mine is wired for 120 volt, 30 Amp with a hot, neutral and ground wire. The clock works fine

A:  It does save and we also have the electric company auto-disconnect. I have the timer set to be on only 2-3 hours in AM and 2-3 hours in PM. Don't have current figures to quote, but checked it after first installing 25 years ago and it cut heater usage drastically then.

A:  It's hard to say, I've always setup and used the water heater timer from the start. If I don't use the water heater timer, my electric bill will be high. It's worth it, to install the water heater timer, if you want to save money. Turning on the water heater, when you need the hot water, then turning it off. That's what I do to keep my electricity bill cost low. If you want to know the difference, check your electricity bill without the water heater timer. Then install the water heater timer to see the difference.

A:  Good morning, this is Selina from Intermatic Consumer Services. Thank you for your question on our 40-Amp 240-Volt Electric Water Heater Time Switch. Please contact our Technical Support team to determine if this model will suit your application of running two or more items. You can reach Technical Support by email at techsupport@intermatic.com or by phone at 815-675-7000. We appreciate your business!

A:  yes

A:  It's designed to utilities only one 240 amps only, it's very dangerous to use it for 2 ea - 240 amps, it has a change of causing an electrical short, which will cause an explodes. Then will cause an electrical fire and burn down anything near the water heater time switch.

A:  Yes, you will use less electricity, bring your electricity bill cost down. That's how I keep my electricity bill cost down.

A:  NO ! I gave it a full month and watched my KW hours per day, I only saved 11 KW hours per month that works out about $1 Dollar a month. Also I had trouble with the timer not switching on where I had to reset the timer twice in 30 days. Not worth it, it will take more energy to heat up the water heater from cold than keeping it on all the time. I dropped from a 40 gallon to a 30 gallon electric water heater since I don't use much hot water and not home most of the time and was very disappointed my electric usage didn't drop as much as I expected. I wasted $60 for this timer to find out it was a waste of money and time so learn from my mistakes

A:  Yes it does , kind of.. these timers are what I believe being made over seas and the quality is crap.. Better to just install a switch and control the WH manually ... want to save - build a radiant / solar heater and cut the electric cost by 90%

A:  It has to. My water heater is On for 10 hrs and Off for 14 hrs.

A:  Good morning, this is Selina from Intermatic Consumer Services. Thank you for your question on our 40-Amp 240-Volt Electric Water Heater Time Switch. When you have a moment, please contact our Technical Support team to determine if this model will be suitable for your needs. You can reach Technical Support by email at techsupport@intermatic.com or by phone at 815-675-7000. We appreciate your business!

A:  For us, it is not an issue of saving money. We are off-grid, and we only want the water heater to run during peak solar output at mid afternoon. This lets us control when the water heater turns on, if needed.