Like the name says, tankless water heaters have no water storage tanks. Water is heated right away as it passes through the unit.

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Q: We’re building a new home and I want a natural-gas or propane tankless water heater. I also want a recirculating hot-water system in my home for quicker hot water. Do they make gas-fired tankless water heaters that can recirculate hot water?

A: Like the name says, tankless water heaters have no water storage tanks. Water is heated right away as it passes through the unit.

This has a couple advantages. First, there is no stored tank water to keep heating up all day. Second, tankless units can supply a constant stream of hot water, since there is no tank to empty.

This makes for a very convenient way to heat and use domestic water. Smart technology allows for new gas-fired tankless units with built-in pumps to add the option of recirculating your home’s hot water. Recirculation gets hot water quickly to your plumbing fixtures, while less cold-water waste goes down the drain.

Master contractor/plumber Ed Del Grande is known internationally as the author of the book “Ed Del Grande’s House Call,” the host of  TV and Internet shows, and a LEED green associate. For more information, visit eddelgrande.com.