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Author Topic: Z-wave relay for hot water heater  (Read 27159 times)

Offline anthonyris

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Z-wave relay for hot water heater
« on: April 30, 2011, 08:44:38 pm »
Anyone using a relay to control an electric hot water heater? If not a relay, how?

I have a Rheem Hybrid Heat Pump in our weekend house, and would like to be able to control it via Vera (have hot water when we arrive is a huge WAF credit...

It's 240v with a max draw of 22 amps.

.//A.
Vera3x2, Leviton, GE dimmers, relays and lamp modules, Sonos, Nests...

Offline JOD

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Re: Z-wave relay for hot water heater
« Reply #1 on: April 30, 2011, 11:52:01 pm »
Yep, I'm using ELK 9200's on my heaters plugged into controlled outlets. Not my first choice, I wanted the Intermatics but they were discontinued at the time.

JOD.
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Offline huogas

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Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline iflyM3

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Re: Z-wave relay for hot water heater
« Reply #3 on: May 01, 2011, 12:25:44 pm »
that's funny, i was just looking over the ELK 9200 last night thinking to myself what else I could use that for besides my hot water heater (central HVAC emergency shut off?)... and I also stumbled upon the Evolve LFM-20 wondering what I could connect that thing to, perhaps make a z wave controlled robotic lawn mower, how about a z wave controlled Roomba?  lol.
« Last Edit: May 01, 2011, 12:29:36 pm by iflyM3 »
Vera 2 UI5 (1.5.622)... and too many Z-Wave/Ethernet/Wi-Fi devices to list.

Offline oTi@

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Re: Z-wave relay for hot water heater
« Reply #4 on: May 02, 2011, 09:46:36 am »
Evolve LFM-20 is maybe not just enough ?
And you'd probably need two, and make sure you always switch them in tandem (which is a given in the mentioned ELK and Intermatic units).
« Last Edit: May 02, 2011, 12:23:47 pm by oTi@ »
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Offline shady

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Re: Z-wave relay for hot water heater
« Reply #5 on: May 02, 2011, 09:10:40 pm »
You'd want to use an electrical 220VAC contactor purchased at your local electrical supply shop.  Then you'd trigger it with a simple 120VAC Z-Wave appliance module.  Bring your appliance module with you when you go to buy the contactor and the load info water heater and explain to the electrical supply shop what you are trying to do.
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Offline huogas

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Re: Z-wave relay for hot water heater
« Reply #6 on: May 02, 2011, 09:20:09 pm »
A "relay" activating a relay that feed the electric water heater !

Good idea Shady!
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline oTi@

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Re: Z-wave relay for hot water heater
« Reply #7 on: May 02, 2011, 09:28:09 pm »
A "relay" activating a relay that feed the electric water heater !
Such as the ELK 9200 solution presented by @JOD. Or anything like it, as @shady suggested.
« Last Edit: May 02, 2011, 09:40:48 pm by oTi@ »
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Offline huogas

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Re: Z-wave relay for hot water heater
« Reply #8 on: May 02, 2011, 10:29:37 pm »
Right !  :)
Vera2 UI4(1.1.1245/3.2), Kwikset x1, HM-DW001 x1, ZRP100 x1, HA-04WD x1, ZDP100 x6, HSM100 x2, VRI06-1LX x8, ZW5301 x1, HM-FS001 x2, ZRW103W x1, GE 45606 x2, HA05C x1, TED5000 x1

Offline FrankHill73

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Re: Z-wave relay for hot water heater
« Reply #9 on: May 02, 2011, 10:40:33 pm »
A "relay" activating a relay that feed the electric water heater !
Such as the ELK 9200 solution presented by @JOD. Or anything like it, as @shady suggested.

I used the 220v contactor over the Elk for my pool pump because of the cost differential. My .02
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Offline iflyM3

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Re: Z-wave relay for hot water heater
« Reply #10 on: May 02, 2011, 11:04:02 pm »
That is another brilliant idea!  Please keep them coming!
Vera 2 UI5 (1.5.622)... and too many Z-Wave/Ethernet/Wi-Fi devices to list.

Offline anthonyris

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Re: Z-wave relay for hot water heater
« Reply #11 on: May 05, 2011, 07:38:06 pm »
Thanks. Wanted to check if anyone actually had one in service. Glad its working. Will also allow me to shut it down overnight. I have a good size solar array, net-metered, so I try to isolate electrical usage to daylight hours to make up for the $.20 --> $.10 beating I take per kWh selling power back to LIPA.

 ordering from AutomatedOutlet this evening... $78.
.//A.

Yep, I'm using ELK 9200's on my heaters plugged into controlled outlets. Not my first choice, I wanted the Intermatics but they were discontinued at the time.

JOD.
Vera3x2, Leviton, GE dimmers, relays and lamp modules, Sonos, Nests...

Offline JimMac

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Re: Z-wave relay for hot water heater
« Reply #12 on: May 06, 2011, 02:53:15 pm »

Offline shady

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Re: Z-wave relay for hot water heater
« Reply #13 on: May 06, 2011, 08:36:27 pm »
I used the 220v contactor over the Elk for my pool pump because of the cost differential. My .02

You're right, you can save some money doing it that way, by sizing the contactor for you application.  Ebay has this 40A contactor for $40, but $64 for the 60A Elk one is a pretty good deal and you get an alarm enclosure.

http://compare.ebay.com/like/110678587028?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=230306896370&crlp=1_263602_309572&UA=WXI7&GUID=2c1a79f212f0a0269971ea61fff4d3b8&itemid=110678587028&ff4=263602_309572

Quote from: huogas
A "relay" activating a relay that feed the electric water heater !

Thats how I turn my PC on/off with Z-Wave (using a little 120VAC ice cube relay and appliance module).

Vera3 1.5.346, Schlage (3)DB (2)Lever, Kwikset (1)Lever, RCS TZ43 Thermo, (2) Vizia RZI06-1LX 600W Dimmers, (17) Monster (Leviton) Dimmers (6) Monster (Leviton) IWC Scene Controllers (1) Etherrain-8, (3) HSM 100's (1)GE 3-Way set

Offline JimMac

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Re: Z-wave relay for hot water heater
« Reply #14 on: May 25, 2011, 10:54:44 pm »
I thought that I would post this for information to others who are also looking to control high current appliances.  I received last week two ELK 9200's.  Connected one to my hot water tank and a z-wave plug outlet.  Works great, now when I enter my door code not only does my water supply turn on so does my hot water tank.  It also turns off with my exit scene, great energy saver.  I am installing the second one to control my hot tub.  Were I live the cost of electricity will vary up to 50% depending on the time of day/night starting this June.  I have programmed my hot water tank and hot tub to only turn on during the least expensive times.  I can over-ride either one using a secondary scene controller if I want to.  Since this is for my summer home and I'm only there on weekends and holidays saving 50% on electricity with these two appliances makes Vera pay for herself very quickly.  I'm ordering two more for my rental cabin, no renters, no wasted power.  The only modification I made was to take the relay out of the second box and added it to the first (now two-in-one).  Saves space on my wall.
« Last Edit: May 30, 2011, 10:35:57 pm by JimMac »