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Water Heating

Water Heating

Water heating is the second largest energy expense in your home. It typically accounts for about 18% of your utility bill after heating and cooling.

There are four ways to cut your water heating bills: use less hot water, turn down the thermostat on your water heater, insulate your water heater, or buy a new, more efficient model.

Water Heating Tips:

  • Install aerating, low-flow faucets and showerheads.
  • Repair leaky faucets promptly; a leaky faucet wastes gallons of water in a short period of time.
  • Set the thermostat on your water heater to 120°F to get comfortable hot water for most uses.
  • Insulate your electric hot-water storage tank but be careful not to cover the thermostat. Follow the manufacturer's recommendations.
  • Insulate your natural gas or oil hot-water storage tank but be careful not to cover the water heater's top, bottom, thermostat, or burner compartment. Follow the manufacturer's recommendations; when in doubt, get professional help.
  • Insulate the first 6 feet of the hot and cold water pipes connected to the water heater.
  • If you are in the market for a new dishwasher or clothes washer, consider buying an efficient, water-saving ENERGY STAR® model to reduce hot water use.
  • Install heat traps on the hot and cold pipes at the water heater to prevent heat loss. Most new water heaters have built-in heat traps.
  • Drain a quart of water from your water tank every 3 months to remove sediment that impedes heat transfer and lowers the efficiency of your heater. Follow the manufacturer's directions.

Although most water heaters last 10-15 years, it's best to start shopping now for a new one if yours is more than 7 years old. Doing some research before your heater fails will enable you to select one that most appropriately meets your needs.

Long-term Savings Tips:

  • Buy a new energy-efficient water heater. While it may cost more initially than a standard water heater, the energy savings will continue during the lifetime of the appliance. Look for the ENERGY STAR® and EnergyGuide labels. You can find the ENERGY STAR label on efficient water heaters in the following categories: high efficiency gas non-condensing, gas condensing, electric heat pump, gas tankless, and solar.
  • Consider natural gas on-demand or tankless water heaters, which heat water directly without using a storage tank. Researchers have found energy savings can be up to 30% compared with a standard natural gas storage tank water heater.
  • Consider installing a drain-water waste heat recovery system. Drain-water, or greywater, heat recovery systems capture the energy from waste hot water -- such as showers and dishwashers -- to preheat cold water entering the water heater or going to other water fixtures. Energy savings vary depending on individual household usage.
  • Heat pump water heaters can be very cost effective in some areas. Heat pump water heaters can cut water heating costs by an average of 50% over standard electric water heaters. If your water heater is located in your basement, it will also provide dehumidification in the summer months. However, this technology can pose some installation challenges, so you should consult with an installer before you purchase one.

Average Hot Water Usage

Faucets and appliances can use a lot of hot water, which costs you money. Look for ways to heat your water more efficiently and use less.

Activity Gallons per Use
Clothes washer 25
Shower 10
Automatic dishwasher 6
Kitchen faucet flow 2 per minute
Bathroom faucet flow 2 per minute
Total daily average 64

Solar Water Heaters

If you heat water with electricity, have high electric rates, and have an unshaded, south-facing location (such as a roof) on your property, consider installing a solar water heater. The solar units are environmentally friendly and you can have them installed on your roof to blend with the architecture of your house.

Solar water heating systems are also good for the environment. Solar water heaters avoid the greenhouse gas emissions associated with electricity production. When shopping for a solar water heater, look for the ENERGY STAR label and for systems certified by the Solar Rating and Certification Corporation or the Florida Solar Energy Center.


Source: U.S. Department of Energy

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Phone:   (210) 693-7651
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