2016 and 2017 ENERGY STAR Contractor of the Year. Based in Portland and Bend, GreenSavers is a national leader in home energy efficiency. Get a home energy audit or estimate for insulation, windows, furnace, air conditioner, ductless heat pump, water heater, seismic or solar system.

All about the Navien tankless water heater



A tankless gas water heater heats water directly without the use of a storage tank. When a hot water tap is turned on, cold water travels through a pipe into the unit, where a gas burner heats the water in an instant. As a result, the tankless system delivers a constant supply of hot water to your home.


Reclaim square footage. A tankless water heater is about 80% more compact than a conventional tank water heater. When most clients install a tankless water heater, they’re also able to remove their old masonry flue. Consider two things: (1) a masonry flue takes up about 4-square feet per floor; and (2) the median price per square foot in Portland is $289 in Portland and $248 in Bend. Removing a masonry flue in a 2-story home with a basement will increase the value of the home by about $3,468 in Portland and $2,976 in Bend.

Protect indoor air quality. If your current gas water heater is atmospherically vented, there’s a chance that your system will backdraft, spilling large concentrations of carbon monoxide into your home. Tankless water heaters prevent carbon monoxide from entering your home by sealing the combustion process and direct venting any carbon monoxide outside.  

GreenSavers Consultant Justin V. finds evidence of a backdrafting gas water heater.

GreenSavers Consultant Justin V. finds evidence of a backdrafting gas water heater.



  • Get as much hot water you want. The Navien NPE-240A combines a small insulated buffer tank with a recirculation pump to deliver a constant stream of hot water. There’s no need to wait for a water tank to fill and heat. Just open the tap and get 8.7 gallons of hot water per minute.

  • The most efficient water heater. The ENERGY STAR certified Navien NPE-240A has the highest energy efficiency ratings in the market - up to 0.97 UEF / 0.99 EF.

  • It’s built to last. With dual stainless steel heat exchangers, the Navien NPE-240A Tankless Water Heater comes with an expected lifespan of 20 years, which 5 to 10 years longer than conventional tank water heaters. This system gives you more years with less maintenance.


Do you have questions about your water heater?

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Schedule a free tankless water heater estimate



You will receive a detailed estimate to install a tankless gas water heater, complete with pricing, rebates, and available tax credits. As a 3 out 3-star trade ally contractor with Energy Trust of Oregon, we can help you access cash incentives to make it easier to improve your home’s energy efficiency.