|Tankless Water Heaters
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 you 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.
unit. Either a 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.
Typically, tankless water heaters provide hot water at a rate of 2–5 gallons (7.6–15.2 liters) per minute. Gas-fired tankless water heaters produce higher
flow rates than electric ones. Sometimes, however, even the largest, gas-fired model cannot supply enough hot water for simultaneous, multiple uses in
large households. For example, taking a shower and running the dishwasher at the same time can stretch a tankless water heater to its limit. To overcome
this problem, you can install two or more tankless water heaters, connected in parallel for simultaneous demands of hot water. You can also install separate
tankless water heaters for appliances -- such as a clothes washer or dishwater -- that use a lot of hot water in your home.
Other applications for demand water heaters include the following:
water heaters. They can be 8%–14% more energy efficient for homes that use a lot of hot water -- around 86 gallons per day. You can achieve even greater
energy savings of 27%–50% if you install a demand water heater at each hot water outlet. ENERGY STAR® estimates that a typical family can save $100
or more per year with an ENERGY STAR qualified tankless water heater.
The initial cost of a tankless water heater is greater than that of a conventional storage water heater, but tankless water heaters will typically last longer and
have lower operating and energy costs, which could offset its higher purchase price. Most tankless water heaters have a life expectancy of more than 20
years. They also have easily replaceable parts that extend their life by many more years. In contrast, storage water heaters last 10–15 years.
Tankless water heaters can 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 constantly burning 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.
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Therefore, it's best to have a qualified plumbing and heating contractor install your demand water heater. Do the following when selecting
Periodic water heater maintenance can significantly extend your water heater's life and minimize loss of efficiency. Read your owner's
manual for specific maintenance recommendations.
water heating bills. Some energy-saving devices and systems are more cost-effective to install with the water heater.