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water heater timer switches Control water heater with Countdown Timer
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water heater timer switches Control electric water heater with Switch
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Control electric water heater with Box timer

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Wifi contactor
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WiFi Contactor 
WiOn contactor from  
Woods 50054
Auto detect voltate/ 120, 208, 240, 277 volt
30 amp
Outdoor metal box with 3 knockouts for 1/2" or 3/4", located on sides and bottom.
Illustration shows test wire at my house before installation.
No NC terminals/ DPDT

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DEWENWILS brand wifi
Wifi power switch
WiOn contactor from Amazon

Resource:
How to wire WiOn for 120 volt and 240 volt
wemo Wi-fi: Control electric water heater with wireless WeMo
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Control 240 volt with WeMo

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WeMo at Amazon
Control 120 volt with z-wave
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Z-wave: Control any 120 volt or 240 volt load with Phone 
Any amperage
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Z-wave controllers
Z-wave switch

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Parts and wiring details/ step by step
Contactors
Fuseholder
How to wire subpanel
Wire size chart
Smarthings Hub Z-wave: Control any 120, 240, 277 volt load with Phone 
30 amp CA3750/ 2-channel
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CA3750 and related products at Amazon
Z-wave controllers

Resource

How to wire CA3750
Elk remote control contactor X10/ 60 amp contactor
Plug into 120V outlet.
Relay works with automated hardware.
Rated up to 60 amps.
Buy:
Elk relay contactor at Amazon

Resource:
Elk-9200 manual
Insteon 2477SA1 X10 load controller  
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X10 relay for electric water heater
Relay handles resistiveload only:
Water heater, incandescent light bulb... yes
Motor, CFL, LED.... no
2 year warranty/ must use Insteon X10 compatible controller etc.
Buy: $120
Insteon 240v / 30 amp X10 load controller for resistive loads only
Insteon remote control products at Amazon
ISY home automation devices at Amazon
Resource:
Insteon load controller manual
GAS water heater timer
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How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
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Troubleshoot Gas valves with manuals
Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric


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Titan tankless

Contactors/ relays
Type 1 and type 2 surge protection surge protection
Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
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Campbell Hausfeld air powered
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box timers Resource:
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DPDT timers
Intermatic
Control water heater w/ Z-wave
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Intermatic control centers: and parts
Digital control centers and parts
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Subpanels
All control centers and parts
Enclosures
programmable timer Resource:
Programmable timers
Countdown timers
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