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How to install electric meter on 240Volt water heater

Electric meter on water heater

Final image: meter on water heater

-Buy digital meter for easy read-out.
-Install meter and meter box level so it looks right.

Buy meter and base:
New and used electric meters 120v and 240v
Meter bases

Larger image

Install meter on subpanel

Meter electric usage of garage apartment
Meter electric usage of home office for tax purpose
Meter electric usage of workshop for tax deduction
Monitor electric use of tankless electric water heater


Resources:
How to wire tankless electric
How to get electric service

Step 1:  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.


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

Shop Amazon - Industrial and scientific
Shop Amazon - Industrial Electric Products
240 volt water heater circuit

Step 2: Disconnect wire from water heater

Disconnect 240Volt wires from water heater.
Wires can be black-and-white or black-and-red.

Step 3: Review electric meter

Stab meter into meter box.
4 prongs on meter stab into meter box.
It takes strong push to install meter.
Meter 'plugs in' like extension cord
There are no screws or fasteners that hold meter in place.
Meter box
Larger image
Neutral wire is not used for 240Volt circuit

Step 4:  Attach wire to meter box

READ INSTRUCTIONS THAT COME WITH METER

1) Attach meter box to wall or supports with screws.
Meter box must be strong and secure.
Keep meter box level so meter is level and looks right

2) Use conduit, or approved connections at meter box.
This example shows 1" gavanized pipe and attachment brace.

3) Connect 240Volt wires from circuit breaker to top prongs inside meter box.

4) Screw down terminals very tight against wire.
Meter box
Larger image
Image shows 240Volt circuit. Neutral wire is not used for 240V circuit

Step 5: attach 2nd wire to meter box

10 gauge wire for water heater has 2 Hots and 1 ground
2 Hot wires and 1 ground wire enter and leave meter box
Install new wire between water heater and meter box.
Example shows orange-colored 10 gauge wire recommended for water heater circuit.
Use same gauge wire as original wire from circuit breaker.
Do not use smaller gauge wire.
Larger wire is fine since it runs with less heat loss.

Resources:
See wire sizes

Connect one end of new wire to lower prongs on meter box. Connect other end to water heater.


Household NM-B Wires are color-coded so inspectors/ electricians can easily identify which wire is used during construction
See more wire gauges

General Wire information

Example wiring shows 10-2 wire with ground.
The black wire is Hot.
The white wire is Hot
There is no neutral in the example wiring.



Resources:
See wire sizes
Read more about electric wiring
10-2 NM-B

Black tape marks white wire that carries power

10-2 w/g NM-B household wire. Add black tape to white wire when using white wire for Hot instead of Neutral.
connect 10-3 to meter box
Larger image

10-3 wire
10-3 w/g (with ground) NM-B indoor household wire

How to connect 10-3 wire to meter

If your 240Volt circuit has neutral, then neutral does not connect to meter.
Applies to single-phase/ split phase 240volt residential
The Neutral wire does not connect to meter
For example when installing meter on electric dryer.

Resources:
How to wire 240Volt outlets
See wire gauges and charts
Water heater on porch
Larger image
Keep meter box level so meter is level and looks right  

Finish details

1)  Make sure meter box is attached firmly to solid surface.
2)  Make sure wiring matches manual that comes with meter
3) Check for latch on back of 120V-240v meters
4) Stab meter into meter box. It takes strong push to install meter. Meter 'plugs in' like extension cord, and there are no screws or fasteners that hold meter in place.
5) Turn 240Volt circuit breaker ON. Meter records usage as water heater consumes power.

6) If water heater is not working. Remove cover on water heater. Remove wire connectors and test Black wire to bare ground. Test White wire to bare ground. This will ensure that water heater is receiving power and that ground wire has continuity back to breaker box.

Resources:
How to troubleshoot electric water heater
How to select wire size
Latch on back of electric meter
Larger image
Electric meter latch
Closed
latch
Meters rated for 120Volt and 240Volt have latch on back of meter.
Meters rated for 240Volt-only do not have latch

Meter latch on back of electric meter

Latch on back of electric meter can be open or closed.
Electric power will flow to water heater if latch is open or closed..
Meter will not record Killowatt-hours unless latch is closed. Be sure to tighten screws holding latch.
Tamper with electric meter
Don't do this.

How to by-pass household electric meter using latch:

      Homeowner can stop household electric meter from recording Kwh by opening latch on back of meter. If you do this with your household meter, the electric company will catch you.
      One fellow opened the latch on his household meter, and then connected the open latch screws to a photoeye so the meter recorded Kwh during the day, but turned off at night. The house still receives electicity when latch is open, but the meter does not record Kwh.
      To start an investigation, call electric company and ask how to tamper with your electric meter.

Resources:
Read about pulling electric meter and replacing circuit breaker

Kundas in India
India loses 38% of power to illegal hookups

Here's another brilliant idea: Kunda

Cut down electric pole and steal transformer in front of neighbor's house.
He cannot have loud parties without power pole. Win-win.

Cut down neighbor's pole after shooting out fuse attached to hot wire coming into neighborhood.
After fuse trips, all power will be out for a couple hours. Unless China is watching your smart meter.
This will give you time to work after pole is dropped and meter is available for harvest... but power company might reconnect any time.
Be careful, don't stand knee-deep in swamp while stealing transformer. Gator might sneak up.

Next, throw new wire with hook over the Hot wire on pole in front of your house.
When power company reconnects, this hookup will supply ample 7,200 volts or less depending on local grid. Put voltmeter on it and see what you got.
Run 7,200 volts into stolen  transformer to create household voltage. For FREE.
Now heat yor moonshine still with electric power instead of burning dirty wood chips... and enjoy unlimited 'off grid' freedom.   'Til yor wife's sister turn you in for beating ur wife.
Wear insulated shoes. Leave baby inside.

Don't do this, or you will get killed for sure. And Mom will start drinking again and need to sell the tow truck to pay bills.

Resources:
What is 3-phase electric: // power plant to end user

Single-phase meter box
Household Meter box has live power at all times

How to remove power company meter

To remove power company meter:
Power company Meter will have locking band
Call power company for 'meter pull'  Read more
Pull down firmly, and then shove upward
Repeat until meter comes loose
Turn off brekaers before installing or removing meter

Resources:
More about household electricity
More about power grid

Larger image
Meter box wiring

Installing Hour meters on water heater

If hour meter is installed directly to incoming wires at top of water heater, the meter will run full-time since it will receive power full time.
How to meter 240Volt water heater

Use 240 Volt Hour meter

Requires two 240Volt hour meters. One meter for each element.
Install meter on each element as shown in illustration.
240Volt potential exists across element terminals. When thermostat closes the circuit, then 240Volt element is turned ON. The hour meter will turn ON at same time.

Buy:
UWZ48E-240V AC hour meter at Amazon
Intermatic bezel to support UWZ hour meter
Intermatic ac hour meters at Amazon
Intermatic terminal wires Do not install stranded wire and solid wire under same screw terminal. Do not install 2 different gauge wires under same screw terminal. Doing so can result in loose wires and heat damage to element and wires.

Connect wires with wire connector, then put one wire under element screw plate.

Install Hour meters

Illustration is for illustration purpose only.
Wiring should NOT be open as shown in illustration.
All wiring should be enclosed inside covered electrical box.

Actual installation might require drilling holes in water heater covers and installing electrical box directly to front of water heater.

Factory insulation and covers must be put over both elements and thermostats so water heater thermostat will read correct temperature

Altering water heater will void warranty
Water heater cover
Larger image

Cover thermostats with insulation

Factory protector, insulation and covers must be put over both elements and thermostats so water heater thermostat will read correct temperature.

Thermostat exposed to cooler room temperatures and will misread tank temperature, leading to scalding and overheating dangers.

Resources:
Water heater safety precautions
Troubleshoot electric water heater

Wattage printed on side of element

Label on side of tank also shows watt rating.
Measure voltage of incoming power for 240V

Resources:
How to figure volts, amps, watts for electric water heater
How to test elements
Hour meter results

How to read hour-meter results:

Wattage of element must be determined
Use multimeter to check voltage of water heater
Look at label on side of tank for different wattages at different voltages
Lower voltage means lower wattage than shows on element.
Confirm element wattage printed on end of each element

For example 4500 watt element and 240 volts
Hour meter reads 6 hours
4500 watts x 6 hours = 27,000 watt hours
27,0000 divided by 1000 = 27 kilowatthours

Experiment: Set lower thermostat to 120 degrees, and set upper thermostat to 135 degrees and use hour meter results from each element  to determine if water heater runs less than having both thermostats set at 135 degrees.

Resources:
Ohm chart for testing elements
How to test elements
Read 9 ways to save with water heater

Information links for Elements and thermostats

How to test elements
How to wire water heater thermostats
How to troubleshoot electric water heater

More Do-it-yourself water heater

How much does it cost to run electric water heater

Compare your meter results with charts below and then e-mail your scientific results: geno03245w@gmail.com
Small water heater
3 hours is approximate daily run-time for water heater [depending on usage and temperature of incoming water etc]
Bath uses 12-15 Gallons hot water <> shower uses 5-9 Gallons hot water > Hot water use chart

Example

5500 Watts x 3 hours = 16,500 watt-hours or 16.5 Kwh per day
For a full 30-day month <=> 30 days x 16.5 Kwh per day = 495 Kwh per month for water heater electricity
Calculate cost <=> 495 Kwh x $.10 per Kwh = $49.50 + add tax
3 hours per day
5500 Watt  = 495 Kwh per month
4500 Watt  = 405 Kwh per month
3500 Watt  = 315 Kwh per month
1500 Watt = 135 Kwh per month
Watts appear on water heater label
3 hours a day @ 10 per Kwh
5500 Watt tank = $49.50 per month
4500 Watt tank = $40.50 per month
3500 Watt tank = $31.50 per month
1500 Watt tank = $13.50 per month
+ add tax
3 hours a day @ 12 per Kwh
5500 Watt tank = $59.40 per month
4500 Watt tank = $48.60 per month
3500 Watt tank = $37.80 per month
1500 Watt tank = $16.20 per month
3 hours a day @ 14 per Kwh
5500 Watt tank = $69.30 per month
4500 Watt tank = $56.70 per month
3500 Watt tank = $44.10 per month
1500 Watt tank = $18.90 per month
     3 hours a day @ $.16 per Kwh
    5500 Watt tank = $79.20 per month + tax
    4500 Watt tank = $64.80 per month
    3500 Watt tank = $50.40 per month
    1500 Watt tank = $21.60 per month
     3 hours a day @ $.20 per Kwh
    5500 Watt tank = $99.00 per month + tax
    4500 Watt tank = $81.00 per month
    3500 Watt tank = $63.00 per month
    1500 Watt tank = $27.00 per month
Average electric price by state
Avg state price chart in pdf
Kill a watt meter
Larger image
120Volt
Use Kill A Watt meter to measure 120V electric usage for TV, refrigerator, etc
Instruction .pdf

Energy meters at Amazon
More energy meters
Family charts:
Math charts for setting water heater timer by incoming water temperature

Calculation for heating water with electricity

Additional links
Electricity from power plant to distribution substation
Larger image
What is 3-phase electric: power plant to end user


Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy:
Multimeters at Amazon
Electric testers at Amazon 
Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrcial repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectorss
NEVER assume power is OFF
Buy:

Non-contact voltage tester Amazon
Electric testers at Amazon
 
Resource:
How to test electric power is off

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors 
Buy

Connector assortment at Amazon
Connector assortment at Amazon

Resource
How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install twist-on wire connectors
Wire connector wrench

Wrench to apply wire connectors

Tighten connector 
Buy

Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
add solder to stranded wire

Turn stranded wire into solid wire

Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.
Buy:
soldering guns
Resource

Timer caught fire

linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times

Fire caused by stranded wire

Do not use stranded wire under screw plate

Applies to timers, switches, outlets, pumps etc.
Small devices, with small loads, such as lamp socket, stranded wire is fine
Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.
Buy:
soldering guns
Resource

Timer caught fire
Basic household wiring
Basic water heater circuit

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

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

How to wire dimmer
How to wire 3-way dimmer
How to wire occupancy switch
How to wire motion detector
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire off-delay timer
Wire off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
Reverse photoeye so it turns on in day
24 Volt photoeye
24 volt programmable timer

How to wire switches
How to add switch
How to add 3-way switch


Timer for 3-way switch
Timer for 4-way switch

How to add outlet 
How to wire 3-way switches
How to wire 4-way switches


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

Electrical formulas
Electricians forum
 

Electrical pages


How to wire arc fault breaker
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
Wire 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
Replace breaker
Install subpanel

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

Convert AC water heater to DC
How to wire DC solar water heater
DC relays for solar water heater
How to add another thermostat to water heater

How many Kwh to heat water
Chart for figuring heating time for electric heater
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

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