Energy Cost Calculator for Electric and Gas Water Heaters

Vary equipment size, energy cost, hours of operation, and /or efficiency level.
INPUT SECTION
Input the following data (if any parameter is missing, calculator will set to default value).				Defaults
Type of Water Heater				Electric
Average Daily Usage (gallons per day)*		gallons		64^*
Energy Factor†				0.92 (electric) 0.61 (gas)
Energy Cost		$ /		$0.06 per kWh $.60 per therm
Quantity of Water Heaters to be Purchased		unit(s)		1 unit
* See assumptions for various daily water use totals. † The comparison assumes a storage tank water heater as the input type. To allow demand water heaters as the comparison type, users can specify an input EF of up to 0.85; however, 0.66 is currently the best available EF for storage water heaters.
OUTPUT SECTION
Performance per Water Heater	Your Choice	Base Model	FEMP Recommended Level	Best Available
New Energy Factor
Annual Energy Use
Annual Energy Costs	$	$	$	$
Lifetime Energy Costs	$	$	$	$
Lifetime Energy Cost Savings	$	$	$	$
Lifetime Energy Cost Savings for Water Heater(s)	$	$	$	$
Your selection of a water heater using gallon(s) per day will have a $ energy cost savings per water heater over an estimated 13 year life expectancy compared to the model.
Assumptions "Base model" has an efficiency that just meets the national minimum standard for gas and electric water heaters. Lifetime energy cost is the sum of the discounted value of the annual energy costs based on assumed water heater life of 13 years. Future electricity price trends and a discount rate of 3.2% are based on Federal guidelines. $0.06 per kWh for electricity is the Federal average price in the U.S. $0.60 per therm for gas is the Federal average price in the U.S. Hot Water usage estimates: Average shower (10 minutes)—20 gallons Average clothes washer (one load)—10 gallons Average dish washer (one load)—6 gallons Average faucet flow—2 gallons/minute Total average daily usage is 64 gallons per day
Disclaimer This cost calculator is a screening tool that estimates a product's lifetime energy cost savings at various efficiency levels. Maintenance and installation costs do not vary significantly among the same product having different efficiencies; so, these costs are not included in this calculator tool. For a detailed life-cycle cost analysis, FEMP has developed a tool called Building Life-Cycle Cost (BLCC). This downloadable tool allows the user to vary interest rates, installation costs, maintenance costs, salvage values, and life expectancy for a product or an entire energy project.

Average Daily Usage (gallons per day)*. Default is 64* gallons Energy Factor. Default is 0.92 (electric) 0.61 (gas) Energy Cost amount per kilowatt hour. Default is $0.06 per kWh $.40 per therm Quantity of Water Heaters to be Purchased units. Default is 1 unit New Energy Factor Performance per water heater your choice New Energy Factor base model New Energy Factor FEMP recommended level New Energy Factor best available Annual Energy Use Annual Energy Use Performance per water heater your choice Annual Energy Use base model Annual Energy Use FEMP recommended level Annual Energy Use best available Annual Energy Costs Performance per water heater your choice amount of Annual Energy Costs base model amount of Annual Energy Costs FEMP recommended level amount of Annual Energy Costs best available amount of Lifetime Energy Costs Performance per water heater your choice amount of Lifetime Energy Costs base model amount of Lifetime Energy Costs FEMP recommended level amount of Lifetime Energy Costs best available amount of Lifetime Energy Cost Savings Performance per water heater your choice amount of Lifetime Energy Cost Savings base model amount of Lifetime Energy Cost Savings FEMP recommended level amount of Lifetime Energy Cost Savings best available amount of Lifetime Energy Cost Savings for number or water heater(s) Lifetime Energy Cost Savings for number or water heater(s) Performance per water heater your choice amount of Lifetime Energy Cost Savings for number or water heater(s) base model amount of Lifetime Energy Cost Savings for number or water heater(s) FEMP recommended level amount of Lifetime Energy Cost Savings for number or water heater(s) best available amount of Your selection of a water heater using gallon(s) per day will have a $ energy cost savings per water heater over an estimated 13 year life expectancy compared to the model.