How to install point of use water heater – Water Heater Timers

Electricity to Under counter water heater

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.

1) Buy plastic box with 3/4 Knockout. 2) Use 3/4" male adapter so all 3 wires enter box from same knock-out. 3) Attach timer with self-tapping screws. 4) Remove timer from box to connect terminal ends to timer 5) In this illustration, I trimmed the ground wires shorter and re-applied wire nut so all wires could fit into box before putting cover over box. 6) Attach box next to water heater. Make box accessible so times can be changed. Timer must be re-set to current time after power outage.

2) Read label on dishwasher: Typical dishwasher consumes 6-11 amp at max draw.

3) Label circuit breaker that connects to dishwasher. Check other loads (lights, TV, etc) that are connected to same breaker. Add up total wattage of all items on breaker. Divide wattage by 120Volt to find total amp draw on breaker. Add 6-11 amps drawn by dishwasher to find total load.

4) Can you safely add another 12.2 amp water heater to the circuit?

Electrical capacity calculation: 1) 15 amp breaker with 14 gauge wire is recommended at 80% rated load = 12 amp load. 2) 20 amp breakerwith 12 gauge wire is recommended at 80% rated load = 16 amp load.

3) Combined load for dishwasher and water heater is 18.5-22.3 Amps. If you have 15 amp breaker or 20 amp breaker, then d ishwasher and water heater should not be turned ON at same time.

2) NO NC terminals mean water heater and dishwasher can never be ON at same time.

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How to install point of use water heater - Water Heater Timers