30 amps max, Water heaters, AC units, and (rarely) other straight 240 volt 30 amp appliances: 10-3 wg: 30 amps, Electric clothes dryer, and other 220/110 volt 30 amp combo appliances: 8-3 wg: 50 amps max, Oven or cook top, and other 220/110 volt 50 amp combo appliances: 6-3 wg If your needs change before then or you just want an upgrade, think about replacing your water heater yourself. Make sure the water heater has been properly installed. In the above diagram i shown that the upper water heater element is switched OFF and lower heater element is switch ON. June 10, 2006, 1:35am Single Phase 240V and 230V Non-Simultaneous Dual Element Water Heater Thermostat Wiring. I didn't originally think about water heaters when I came across this rule but it is after all "heating" and entirely resistive. With proper maintenance, modern electric water heaters are designed to last approximately six to 12 years. If the instructions are not clear, contact a qualified service technician. Read on for basic information on positioning the new water heater, connecting the electrical supply and adjusting the thermostat. While all voltages are dangerous, it is this particular voltage which is most notorious for causing severe injury or death. I will be using 10 gauge solid with a ground wire, and stapling it to the ... Gas water heater or electric water, take your choice.-- ... *The code limits a total of 360 degrees worth of bends in a conduit run Page 11: Water Temperature Adjustment In the electric water heaters and thermostat wiring and installation series, we will be showing that how to wire and install a non-continuous (non-simultaneous) dual element water heater and thermostat for 240V AC single phase (US) and 230V AC single phase (UK/EU). OPERATING YOUR WATER HEATER Water Temperature Water Heater Start-Up Regulation Carefully read and understand the section, "Water Temperature Regulation" section of this manual. The national electrical code defines a “wet location” as an area that is subject to saturation with water or other liquids, and unprotected locations exposed to the weather. But I can promise you this JOE…my NEXT water heater wiring will be NM like it has been since 1988 when I did my very first house… pabernathy (Paul Abernathy, Electrical Code Academy,Inc.) How to wire a marey eco 110 tankless water heater 30 amp hot o smith signature 240 volt 7 kw 1 gpm point of use electric in the heaters department at lowes com 3 phase wiring diagram stieble eltron tempra series ecosmart inline on demand 220v until friday installation full version hd quality diagramtobeyz fondazioneliricabari it or installing… Read More » It is extremely important that the circuit be OFF when wiring an electric water heater. Note that these element is 220 volts ratings and you can also 440 volts heater elements but you need to provide the line supply, my mean to lines or two hot wires supply 440 volts. 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