Waterheatertimer.org
is a self-help website
Figure volts amps watts for water heater How to wire water heater thermostats Do-it-yourself
New water heater ideas
2014

Basic 240 & 120 Volt Water Heater Circuits

Dia 1) Typical residential water heater: 240 Volt:

Black and White wires are hot > bare copper is ground
240 volt water heater circuit
Back to connect wires


       
When using black-and-white wires for 240Volt, add tape to white wire.
This action will tell next electrician that white wire carries power



Breaker box

Dia 2) 240 Volt circuit with neutral wire:

Not typically found in residential water heater circuits
Black and Red wires are hot > bare copper is ground > white is neutral
240 volt water heater circuit 
Larger image

Resources:
How to wire thermostats
How thermostats work



Dia 3) 120 Volt water heater circuit: 

Typical example of under-counter water heater
Black wire is hot > white wire is neutral > bare copper is ground
120 Volt water heater circuit
Resources:
Water heater will work on any voltage
Convert 240V water heater to 120V
Connect water heater to generator
color-code household wire
Resource:
Wire sizes

Resource:
Wire nuts and how to twist wire

Main breaker
Larger image

Ordinary Main panel for home has 120 volt and 240 volt circuits.

This is called single-phase electric power. Phasing is determined by the power company.

- Each 120 volt circuit can include up to 12 outlets, and supply power to lights inside a room.
- Generally each 120 volt circuit sends power to one area of home. This is because the wire leaves breaker box and goes to first junction box inside a room. From the junction box, the wire splits off and goes to each individual box, jumping from box to box until the final box is reached. So each box will have 1 black hot wire, 1 white neutral wire, and 1 ground wire that connect back to main breaker box.
- Some circuit breakers are dedicated to 1 specific appliance. For example the kitchen microwave is usually wired to 1 circuit breaker and no other outlets or lights are connected to that breaker. This is because microwave draws so much amperage. That is called dedicated circuit, and dedicated breaker.

- Each 240 volt circuit is usually dedicated to one appliance. For example electric water heater is connected to 1 240 volt breaker. The electric dryer is connected to another 240 volt breaker. The heat/AC is connected to another 240 volt circuit breaker, and so on.
Resources:
See inside main breaker box
How to replace circuit breaker
How to install subpanel
Figure volts amps watts for electric water heater
Main breaker box
Resource:
How to replace circuit breaker

Inside main breaker box are Three busbars.
One busbar is Neutral busbar.
Two busbars are Hot busbars.
Each Hot busbar is 'out of phase' with the other.

All residential circuits require Two wires to complete circuit.
120Volt circuit requires 1 Neutral wire and 1 Hot wire.
Hot wire can come from either Hot busbar.
By Code, these wires are Black-Hot and White-Neutral.
If either wire is interrupted, the circuit turns OFF.
By code the Black Hot wire is switched ON-and-OFF.

240Volt circuit also requires 2 wires to complete circuit.
In the case of 240V, the circuit requires 2 Hot wires.
One Hot wire from each 'out of phase' busbar is required to complete 240Volt circuit.
These wires can be Black and White or Black and Red, and with heavier gauge wires, like 6 gauge and 4 gauge, the wires are Black and Black.
If either wire in 240V circuit is interrupted, the circuit turns OFF.
See 30 amp switch turning off water heater
Bare ground wire connects to Neutral busbar as redundant safety.

Electricity from pole to breaker box


How to install Subpanel
Electricity is a wave that oscillates at 60 cycles per second. This is called 60 Hz.which appears on electric device labels.

Both Hot busbars are identical except out of phase with each other. 240Volt is like adding an extra cylinder to the engine, and gives added power.

Household power is called single-phase or split phase.
Resources:
How to wire 3-phase timers
How to wire 3-phase outlets and surge protection

Three phase wiring offers efficiency for machinery and industry
Phasing is determined by the power company transformer.
Read more details about 3-phase
Install electric meter on water heater
Larger image
Resource:
How to install electric meter on water heater
Resource:
How much does it cost to operate gas and electric water heaters

Additional links
Troubleshoot Household electricity

Figure volts amps watts for electric water heater
How to wire tankless electric
How to change water heater temperature using timer
How to change water heater from 240Volt to 120Volt
How to wire thermostats
How to wire water heater for off peak operation

How to twist wire
How to wire Cooper 277
How to wire combo switch-outlet
How to replace 3-speed fan switch

How to wire 3-way switches
How to wire 4-way switches
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire Dayton off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
How to wire switches

Troubleshoot Malibu outdoor lights
Terminals
Select and install wire nuts
Select wire size

Replace breaker
Install subpanel

Electrical formulas
Electricians forum
How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Romex connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater

See inside main breaker box
Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures
Intermatic timer enclosures


Terminals

Wire nuts and how to twist wire

Replace circuit breaker

How to twist wire

Compare all water heater timers

Drop wire from attic
Do it yourself
Do it yourself water heater

Electricity from pole to breaker box

Leaking water heater

How to install gas water heater

How to wire off-peak water heater

9 ways to save with water heater
Solar water heater
9+ ways to save with water heater

Motorized shut off valve
water heater safety precautions
Water heater safety precautions

Clean sediment from tank

Compare all water heater timers

My art website
Intermatic enclosures
Intermatic trippers and parts

Remove old element

Low hot water pressure

Atwater water heater resources
Recirculation system
Hot water circulation system

Remove water heater from attic
Gas and electric water heaters 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
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
box timers Compare box timers
programmable timer Compare programmable timers
Countdown timers Compare countdown timers
Compare power packs

E-mail: geno03245w@gmail.com
My response might end up in spam folder, check email folders
Site map
Follow newest idea on twitter
Privacy policy