Calculating Energy Usage. An average water heater runs three hours daily. A 50-gallon, 5,500-watt water heater with a .90 EF and an electricity rate of $.16 per kilowatt hour will cost $781 to operate each year. Most water heaters include a label listing the annual operating cost.
Average cost with installation: Tank - $889.00 (40 to 50 gallon tank) Tankless - $3,000.00.
The cost of a 10 minute shower is:132.475 liters, multiplied by the cost per heated liter of water $.0146612, or $1.9424 for the average ten-minute shower in Minneapolis, MN. If one person showered once a day for ten minutes the cost for one month (30 days) would equal: $58.27 per month.
Bathe. Most natural gas water heaters operate with a pilot light, heating water even when the electricity is out. And since they reheat water almost twice as fast as electric models, relying on a gas water heater for bathing during an outage continues to be economical.
Tankless water heaters cost up to three times more than storage heaters — from less than $1,000 for an electric, whole-house model to $3,000 for a gas-powered one, including installation by a qualified plumber. Rewiring your house can easily add as much as $5,000 to the cost of installing a tankless water heater.
One BTU is the amount of heat energy required to raise one pound of water by 1ºF. Water weighs 8.33 pounds per gallon so we can calculate that one gallon of water requires 8.33 BTU to raise the temperature 1ºF. 1 Pound of Gas (1 PSI) = 28″ Water Column (w.c.) 1 Pound of Gas (1 PSI) = 16 Ounces (oz.)
In an average home, showers are typically the third largest water use after toilets and clothes washers. The average American shower uses 17.2 gallons (65.1 liters) and lasts for 8.2 minutes at average flow rate of 2.1 gallons per minute (gpm) (7.9 lpm).
fridge uses 1400 kWh a year, while a modern energy-efficient model uses only 350 kWh — a whopping 75% reduction. At 15¢ kWh, trading in a pre-1986 fridge for a new efficient one would save about $158 a year in electricity costs. And some older fridges are even worse than the average.
This utility uses a uniform rate structure that charges the user $0.00295 per gallon (or roughly 3 cents for every 10 gallons) used during the billing period. The bill also shows a similar facility charge for sewer and a "rate case expense surcharge" to help pay for the utility's rate setting process.
Hybrid, or heat-pump water heaters use a heat pump to pull heat from the surrounding air and put it into the water heater, which also has resistance elements to heat water when conditions won't permit the heat pump to work properly, or when more hot water is needed than the heat pump can produce.
How much propane average homes use & cost of average propane usage
|Appliance||Average Yearly Usage (in gallons)||Average Yearly Cost (based on 2015 average price of $2.60)|
|Hot Water Heater||250||$650|
|Propane Stove Ranges||35||$91|
A water heater's energy efficiency is determined by the energy factor (EF), which is based on the amount of hot water produced per unit of fuel consumed over a typical day. The higher the energy factor, the more efficient the water heater. Then, compare costs with other more and/or less energy-efficient models.
The higher the energy factor, the better. Gas water heaters have energy factors between 0.5 to around 0.7. However, higher energy factor values don't always mean lower annual operating costs, especially when you compare fuel sources. Electric water heaters have higher energy factors.
ENERGY STAR certified water heaters are an easy choice for energy savings, performance, and reliability. They use less energy than standard models, saving homeowners money on their utility bills while helping protect the climate.
Life-Cycle Costs for 13-Year Operation of Different Types of Water Heaters
|Water heater type||Storage Volume (Gallons)||Yearly energy cost (2)|
|High-eff. electric storage||50||$439|
|Demand gas (no pilot)||<2||$228|
|Electric heat pump water heater||50||$190|
|Solar with electric back-up||n/a||$175|
Instead of sending hot exhaust gases out the flue, which wastes energy, this heater blows them through a coil at the bottom of the tank. Incoming cold water flows around the coil and collects most of the heat. That's why condensing gas water heaters are so efficient (up to 96 percent thermal efficiency).
Depending on your local utility costs, gas water heaters are typically cheaper to operate than electric. They also cost more upfront than an electric. However, based on energy savings, gas heaters generally make up the difference in price in about one year. Are less expensive than other water heater types.
When gas burns in a conventional non condensing water heater, the heat generated is available in two forms: Water vapour discharged through the flue Condensing water heaters take advantage of additional efficiency from their ability to pass most of the latent heat into the heating system.
High Efficiency Water Heaters. Provide Hot Water for Less. Heating water accounts for approximately 15 percent of a home's energy use. High efficiency water heaters use 10 to 50 percent less energy than standard models, saving homeowners money on their utility bills.
The main reason why condensing boilers are better than non-condensing models is that they are at least 25% more efficient. Their level of efficiency is achieved by using waste heat in flue gas to preheat the cold water entering the boiler, capturing more heat from the outside rather than the inside of a room.