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How to wire under counter water heater to same circuit with dishwasher
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Reliance water heater
Reliance
6-10 gallon
Side connections/
6 year warranty
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Reliance water heaters
12-3 extension cords
12-3 Southwire cable
Resources
Reliance manual
State manual
American tiny titan water heater
American
6-12 gal
Top connections/
6 year warranty
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American tiny at Amazon
12-3 extension cords
12-3 Southwire cable
Resource:
American manual
State point of use water heater
State / Reliance
American/ are all AO Smith
2.5 - 6 gallon
Top connections/
6 year warranty
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American 2.5 Amazon
Reliance 6 gal Amazon
Resource:
Reliance manual
Ariston water heater
Ariston / Bosch
2.5 - 4 gallon  - 7 gallon
Top connections/
2 year warranty
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Ariston at Amazon
Bosch at Amazon
Resources
Ariston resources
Bosch P10 P5
Electrical capacity of dishwasher and water heater:
1) 15 amp breaker with 14 gauge wire at 80% rated load = 12 amp load/ 1440 watt.
2) 20 amp breaker with 12 gauge wire at 80% rated load = 16 amp load/ 1920 watt.

3) Typical dishwasher 420-720 Watts and draws 3.5- 6 amps (look at label inside door on dishwasher)
4) Typical under counter water heater 2-1/2 gallon to 20 gallon is 1500 Watt and draws 12.5 amps.

5) Combined load for dishwasher and water heater is 2220 Watts and 18.5 Amps.

Objective
: wire both 120V dishwasher and 120V water heater so neither will turn on at same time


Never assume power is OFF
Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.

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Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon

water heater circuit
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Dishwashers at Amazon
How to wire under counter water heater to 15 or 20 amp line that goes to dishwasher.

Objective 1: Either the dishwasher has power or the under-counter water heater has power. But neither at same time.

Objective 2: inexpensive, reliable solution that doesn't require much space and is simple to wire, simple to program and handles job with no chance for error.

Buy:
Intermatic FM1 timers at Amazon
24-hour 120Volt 60 Hz at Amazon
7-day 120volt 60 Hz at Amazon
24-Hour 240Volt 60 Hz at Amazon
7-day 240Volt 60 Hz at Amazon

Project material cost $45  

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Use 20 amp 3-way switch
Use 20 amp 3-way switch
Local box stores sell 15 amp switches.
For longevity of circuit, use 20 amp switch

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20 amp 3-way switch
Alternate timer solution: T1905 timer
Intermatic T1906 T1905 is 120Volt timer with NO and NC terminals
Buy timer:
T1905 series 120Volt 20 amp 1 Hp timer at Amazon
T1905 480 Volt timer at Amazon
T1906 series 208-240V 20 amp timer at Amazon

Parts/ convert timer to different voltage by changing clock motor
125Volt WG730 motor at Amazon
T1905 controls 2 loads Wiring diagram for T1905
Connect 120 Volt water heater as shown

Add dishwasher:
Connect dishwasher black wire to NC terminal.
Connect  dishwasher neutral wire to other white neutral wires.
Timer toggle between applainces

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Buy:
Dishwashers at Amazon

DPDT timers toggle between 240 volt appliances
Other timers with NO NC contacts/ toggle circuit between appliances/ applies to 120V or 240V

GE 15136 timer
See all these timers
Support the economy:
Buy water heaters from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
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Hybrid / heat pump/ water heaters at Amazon

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