Buy On Demand Water Heater
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Buy On Demand Water Heater
Tankless water heaters, also known as demand-type or instantaneous water heaters, provide hot water only as it is needed. They don't produce the standby energy losses associated with storage water heaters, which can save money. Here you'll find basic information about how they work, whether a tankless water heater might be right for your home, and what criteria to use when selecting the right model. Check out the Energy Saver 101: Water Heating infographic to learn if a tankless water heater is right for you, and our #AskEnergySaver discussion on water heating for more answers on efficient water heating.
Tankless water heaters heat water instantaneously without the use of a storage tank. When a hot water faucet is turned on, cold water flows through a heat exchanger in the unit, and either a natural gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water. However, a tankless water heater's output limits the flow rate.
Tankless water heaters avoid the standby heat losses associated with storage water heaters. However, although gas-fired tankless water heaters tend to have higher flow rates than electric ones, they can waste energy if they have a pilot light. This can sometimes offset the elimination of standby energy losses when compared to a storage water heater. In a gas-fired storage water heater, the pilot light heats the water in the tank so the energy isn't wasted.
The cost of operating a pilot light in a tankless water heater varies from model to model. Review the manufacturer's literature to determine how much gas the pilot light uses for the model you're considering. Look for models that have an intermittent ignition device (IID) instead of a standing pilot light. This device resembles the spark ignition device on some natural gas furnaces and kitchen ranges and ovens.
Proper installation depends on many factors. These factors include fuel type, climate, local building code requirements, and safety issues, especially concerning the combustion of gas-fired water heaters. Therefore, it's best to have a qualified plumbing and heating contractor install your demand water heater. Do the following when selecting a contractor:
If you're determined to install your water heater yourself, first consult the manufacturer. Manufacturers usually have the necessary installation and instruction manuals. Also, contact your city or town for information about obtaining a permit, if necessary, and about local water heater installation codes.
After your demand water heater is properly installed and maintained, try some additional energy-saving options to help lower your water heating bills. Some energy-saving devices and systems are more cost-effective to install with the water heater.
Think about it: The way most households in this country heat water is absurdly wasteful. We fill up big 40- to 50-gallon storage tanks, then pour energy into them 24/7, year in and year out, to make sure we have hot water at the ready whenever we want it.
This is definitely a job for a pro, as it involves making leak-free water, vent, and gas connections, in the case of gas or propane units, or upgrading the wiring and circuit-breaker panel, in the case of electric units.
Gas-burning tankless water heaters should operate for 20 years or more, two or three times longer than tank-type heaters. Tankless electric units have shorter life spans, on the order of 7 to 10 years.
Owners of vacation homes know well how long it takes to drain a water-heater tank before closing up a house for the winter. With a compressor, you can drain a tankless heater in a few seconds; then you just unplug it.
When the distance between heater and fixture exceeds 50 feet, look for units with a built-in recirculation pump, which saves water and reduces waiting time. The pump, which can be turned on by a timer