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Figure volts amps watts for water heater | 9 Ways to save with a water heater | Do-it-yourself |
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How to wire under counter water heater |
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 | How to wire under counter water heater to same
15 or 20 amp line that goes to dishwasher. Using FM1 either-or timer Either the water heater has power -or- the dishwasher has power But not both at same time | |||
 I used 14 gauge wire since circuit breaker was rated 15 amp. | Example
wiring: 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 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. FM-1 sell sheet with model numbers More information below: | |||
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 FM1 timer Manual | What are NO NC connections? They are like a 2-pole light switch. When one is OFF, the other is ON. And they are never ON at same time. With NO NC connections, either the dishwasher has power or the under-counter water heater has power. But neither at same time. Choose convenient times to run either appliance. For example after lunch you want to operate dishwasher, but no longer need water heater. And then water heater can remain OFF until shortly before before next meal. This is possible using FM1 Intermatic timer shown below. | |||
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Easy set pins let you schedule optimal times for water heater. 2) NO NC terminals mean water heater and dishwasher can never be ON at same time. 3) Trippers on dial are set in or out to set times. 15 minute intervals for exact times. Change schedule any time. 4) 21 Amp capacity meets project specifications. 21 x 80% = 16.8 amps. Handles 1500 watt water heater or 750 watt dishwasher. 5) Rotate dial until current time lines up with arrowhead located on inner dial. 6) Mount timer inside square plastic box available from home center. Room for wires and wire nuts. Put cover over top when finished.  Cost for electric wiring $45  |
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How to install under counter water heater  Input 1 and 2 are to operate the timer clock motor NO and NC terminals are marked 4 and 5 |
Instructions for wiring: 1) Disconnect 120V cable going to dishwasher. Cable has Black Hot wire and White neutral wire. 2) Black Hot wire and White Neutral wire connect to terminals 1 and 2 on FM1 timer. This will power clock motor 3) Black Hot wire from breaker box also connects to terminal 3. This will send power to the switch. 4) Water heater connection: Black wire to water heater connects to terminal 5. This is the NC or normally closed terminal. This terminal has power when timer switch is OFF. This means water heater can run continuously for all hours of the day except a few hours each day when dishwasher is expected to operate. White wire to water heater connects to other white Neutral wires. 5) Dishwasher connection: Black wire to dishwasher connects to terminal 4. This is the NO terminal or normally open terminal. This terminal has power only when timer is turned ON. White wire to dishwasher connects to other white Neutral wires. 6) How to make terminal connections Yellow for 12 gauge wire; Blue for 14 gauge wire Since NO and NC terminals are never ON at same time, then water heater and dishwasher can never be ON at same time. |
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| Alternate timer solution: GE 15207 timer | ||||
 | GE 15207 timer from Home Depot has NO and NC terminals Link below shows dip switch configuration How to wire GE 15207 timer for 120V and 240V Water heater | |||
 | GE 15207 wiring. Set dip switches for 120 Volt before applying power to timer. Hot wire arrives from breaker and connects to clock terminal Jumper wire connects Hot to COM terminal Dishwasher is connected to NO terminal Water heater is connected to NC terminal Neutral arrives from breaker box and connects to clock terminal. All Neutral wires join on same terminal All ground wires are joined together | |||
| Alternate timer solution: T1905 timer | ||||
 Large image of 120Volt T1905-6 |
T1905 is 120Volt timer with NO and NC terminals Read T1905 manual T1906 & T1905 at Intermatic T1905 for 120 V at Grainger T1905 is 240 Volt/ Not the correct timer for this project Read T1906 manual T1906 & T1905 at Intermatic T1906 at Electric Supplies on-line |
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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. |
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