Tankless water heaters save energy but have drawbacks
Promises of endless hot water, lower energy bills and maximized storage have many homeowners converting from traditional water heaters to tankless. But for some, the benefits may not outweigh the cost. Before you switch, weigh the pros and cons.
Q: How do tankless water heaters work?
A: As water is drawn, it is quickly heated by high-powered burners within a heat exchanger system of coils — heating only what you use. Theoretically, a tankless water system can provide an endless supply of hot water, so long as it falls within the tank’s gallons-perminute capacity.
Q: What are the benefits?
A: The U.S. Department of Energy estimates that tankless water heaters can be as much as 34 percent more energy-efficient than conventional water heaters. And Energy Star estimates that a typical family can save $100 or more per year with a qualified on-demand water heater. They also generate less waste than traditional heaters.
Experts say tankless water heaters will last 20 to 25 years on average — much longer than a traditional heater, which will typically last from seven to 14 years.
Also, tankless heaters are smaller than conventional heaters and may be mounted on an interior or exterior wall. (Tankless heaters should be located within 50 feet of a power source.)
Q: What are the drawbacks?
A: Homeowners pay as much as triple the cost of tank heaters for tankless varieties, which can range from just under $1,000 for an electric model to $3,000 for gaspowered, including installation.
Another downside is while it can theoretically supply an endless amount of hot water, it may not keep up if with demands beyond its capacity.
Finally, installing a tankless water heater may not be as simple as swapping your old heater for a new one. Your home’s gas piping, gas meter and gas line or electrical system may not be the optimal size.
An electric model will need the proper voltage, amperage and circuit breaker. Gasfired models will need proper equipment and venting.
Every heater should be installed by a highly rated plumber or heating, venting and air conditioning contractor.