Buying Guide

Benefits of Tankless Water Heaters

Energy Efficiency
energy efficient water heaters at The Home Depot

While a traditional tank water heater heats water continuously, tankless water heaters heat only as much water as needed, when it is needed. By heating water on demand, tankless units can reduce energy use by 24 to 34 percent compared to traditional water heater tanks.

Lower Utility Bills
lower utility bills

Since tankless water heaters use less energy, they can also lower your utility bills. ENERGY STAR® estimates that the average household can save hundreds of dollars every year by converting to a tankless unit.   

These water heaters can conserve almost 27 to 50 percent more energy than traditional tank models and simultaneously service every high-demand point in your home, such as the bathroom, kitchen and laundry room.

Extended Life Span
tankless water heater - extended life span

On average, tankless water heaters last five to 10 years longer than tank water heaters. With proper maintenance, a tankless water heater can offer up to 20 years of lasting use.  

Tip: Find out how to extend your model's warranty with The Home Depot Protection Plan.

Endless Hot Water
tankless water heaters - endless hot

Households using a traditional tank water heater may run out of hot water because the home's entire supply is stored in the tank. On the other hand, the heating elements in tankless units heat water just when it is needed, for as long as required, offering continuous hot water.

Save Space
tankless water heaters save space

Most traditional tanks hold between 40 to 60 gallons of water and usually measure about 60 inches tall and 24 inches wide. Since tankless water heaters are much smaller, they take up far less space in your home. Their standard size is 28 inches tall by 20 inches wide and 10 inches deep.

Less Maintenance
tankless water heaters require less maintenance

Water heater tanks generally require annual maintenance, and in some regions, they need to be serviced every six months. Alternatively, tankless water heaters require very little upkeep. Depending on the quality of your water supply, they can sustain full function for four to five years without maintenance.   

If you live in an area with hard water, an annual cleaning is still recommended to remove mineral buildup near the heating element. This standard maintenance is easy to perform: use a vinegar solution to flush the unit for 60 minutes and remove any lingering sediment.   

For more information on how to extend the life of your water heater and reduce energy costs, see our Water Heater Maintenance Guide.