All
Costs are energy, so
total energycost equals purchaseprice of water heater, plus
installation,
plus expected maintenance, repairsandparts, plus
water softenerandfilter, plus disposalrecycling cost,
divided
by years of tank life. These numbers are
added to monthly energy consumption to measure true cost of a water
heater. Industry efficiency numbers consider only energy cost per gallon of heated water for brand new tank under ideal conditions. And do not consider drop in efficiency over time, or costs listed above. 
How much does it cost to run electric water heater 

3
hours is approximate daily runtime for water heater
[depending on
usage and temperature of incoming water etc] Bath uses 1215 Gallons hot water <> shower uses 59 Gallons hot water > Hot water use chart Examples assume ordinary 240Volt water heater/ nonsimultaneous operation 5500 Watts x 3 hours = 16,500 watthours or 16.5 Kwh per day For a full 30day 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 month4500 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 

Avg state price chart in pdf  


How to install electric meter on 240Volt
water heater Forget the guesswork. Put a meter on it. Two methods: 1) Install electric meter on line going to water heater 2) Install Hour meter on each water heater element 

Family Chart for setting water heater timer  
Tank
wattage: Figure volts amps watts for water heater 1. Find label on side of water heater 2. or Google brand and model number of heater to find .pdf of manual 3. Voltage & wattage also written on end of each element see example 

See label image 
Look
for watts on label 1. Watt rating of element(s) is usually 1500, 3500, 4500, or 5500 Watts 2. Element wattage ranges from 600 to 6000 3. Water heater wattage is same as element wattage, since both elements are not turned ON at same time. 


How much does it cost to run GAS water heater 

AO Smith gas Larger image 
Size 4050 gallon  Energy factor  Natural Gas year 2010  LP Gas  
.56  $315320  $530  
Typical gas: .58 to .62  .60  $300315  $500  
.67  $272280  $475  
.82  $225  $380  
Water
heaters with higher recovery and firsthour delivery may not have EF
rating. Highrecovery heaters are for highdemand, and consume more BTU per gallon of hot water to keep up with demand. Tankless water heaters also consume more BTUs per gallon of hot water since water is heated quickly as it passes in a pipe. High consumption heaters have larger gas lines and vent pipes. 
Numbers apply to new water heaters EF energy efficiency factor explained First hour rating explained 


Example
Energy Factor Charts for gas water heater Energy factor between gas and electric cannot be compared Each company makes many different models of water heater Each model has chart showing specs including tank size, model number, recovery, BTU input, Energy Factor, etc Water heater manufacturers 

EXAMPLE typical gas water
heater EF American energy factor .58 to .62 Larger image 

EXAMPLE typical gas water
heater EF AO Smith energy factor .58 to .62 Larger image 

EXAMPLE typical gas water
heater EF Rheem energy factor .58 to .62 Larger image 

EXAMPLE 2010 chart showing
typical Lowes Whirlpool
water heaters EF .58 to .62 Larger image 
Compare
equipment using EnergyGuide Label. Label shows what it costs to operate each unit on an annual basis, using national average energy prices. EnergyGuide shows how a particular model compares with other similar models. Be sure to compare water heater models with the same firsthour recovery rating when using the EnergyGuides. Higher firsthour deliver, and higher recovery models will cost more to operate per year since they consume more fuel per minute of operation. All figures are approximate* 

Figure
annual expense using local costs of energy. Residential gas prices are usually calculated in units called therms. (A therm is equal to 100,000 Btu.) (100 cu feet gas = 100,000 Btu) Locate per/therm cost on gas bill, or call gas company. Use chart below to estimate yearly energy costs. 

Larger image All figures are approximate. 
Use
chart to compare gas water heaters at time of purchase Call gas supplier to get therm value of your gas If your gas bill shows 60 cents per therm, then look at water heater energy factor to estimate yearly cost. For example: Cost per therm of gas is 60 cents. Difference between EF.51 and EF.63 is $33 per year Life of appliance is 10 years = $330 over 10 years Be careful to compare water heaters with same recovery and first hour delivery. Higher recovery and firsthour water heaters consume more fuel and cost more per year to operate. 13.446 lbs CO2 per therm 
All
figures are approximate* Figures are for NEW water heater set at 120 degrees Figures are for optimal conditions: Burner is clean, combustion transfer surface is not covered with sediment, etc Temperature setting affects cost: higher thermostat setting costs more Incoming water temperature affects cost: colder water costs more to heat All costs are energy: Lower consumption and turn down thermostat to save money. Maintain water heater so water heater is not replaced frequently. Read more Gas water heater efficiency with water softener Read Efficiency is not same as energy savings/ all costs are energy. 

1
gallon water = 8.34 lbs. / It takes 1 BTU to
raise 1 lb of
water 1° F so it takes 8.34 BTUs to raise 1 lb of water 1° F 
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 
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