Tankless Water Heaters

How Does It Work?

Navien’s Condensing Tankless Water Heaters can provide an endless supply of hot water on demand because Navien’s units activate the second you open the hot water tap. Each time you turn on the faucet, shower, or other water outlet, Navien’s Condensing Tankless Water heater will immediately detect the flow and begin delivering the desired hot water.

Unlike the conventional storage tank water heaters that will eventually run out of hot water, Navien’s Condensing Tankless Water Heaters can deliver an endless supply because they only produce hot water when you need it which limits energy and water waste. With a Navien Tankless Water Heater, you will never have to worry about running out of hot water no matter how much you use at a single time.


  1. When a hot water tap is opened the unit detects the flow.
  2. The flow sensor activates to determine the amount of hot water needed.
  3. The igniter activates
  4. The gas control valve opens to supply the correct amount of gas.
  5. The fan and venturi activate to provide the correct amount of gas and fuel.
  6. The premix burner ignites providing a flame to heat the water.
  7. Cold water is pre heated in the secondary heat exchanger.
  8. Pre heated water passes from the secondary to the primary heat exchanger.
  9. The unit determines outgoing set temperature and adjusts the flame to heat the water.
  10. Heated water moves to the buffer tank.
  11. Desired hot water amount delivered to the faucet.

Tank vs Tankless vs Navien

Navien’s primary condensing stainless steel heat exchangers are able to recover extra heat that would be lost in traditional tankless water heaters. Since all Navien’s tankless water heaters are condensing tankless gas water heaters the exhaust temperature is very low. In fact the exhaust temperature is so low you are able to use PVC schedule 40 to vent the units in almost all applications. The use of PVC allows for significant installation cost savings compared to traditional tankless water heaters.


Condensing Technology

Navien’s Condensing tankless water heaters are ideal for tank replacement providing an exceptional amount of cost savings during operation compared to traditional tank water heaters.

Unfortunately, old-fashioned tank heaters, as well as conventional tankless water heaters, emit harmful Nitrogen (NOx) and Carbon dioxide(CO2) directly into the air at a whopping 245°F-450°F! These harmful emissions damage both us and the environment in which we live.

Navien Condensing vs Tankless vs Tank

With proven condensing tankless technology, Navien Tankless offers improved efficiency, reliable quality and durability,
together with the added assurance of a warranty. Just make the most of your energy.
Key Comparison Aspects Navien Condensing Tankless Tank

Exhaust Gas Recycled! Goes to waste Goes to waste
Energy Factor Up to 0.97 0.8-0.84 0.50-0.65

Ventilation Temperature 85-130°F 245-450°F 200°F and higher
Primary Heat Exchanger Stainless-Steel Copper Enamel Coating Tank

Condensing Heat Exchanger Stainless-Steel N/A N/A
Eco-Friendly Extremely Somewhat Not at all!

Cost Savings
Energy Efficiency = Savings

We here at Navien pride ourselves on manufacturing the most cost-efficient water heaters available. Our built-in hot water recirculation system recirculates hot water that would otherwise be lost, thus, creating a method that lowers the cost of our customer’s water bills each month.

Water Saving

Money Saving
Navien’s state-of-the-art technology means our product has a longer life span and lower operating costs than other water heaters, compounding customer savings. This, coupled with Navien’s space-saving wall-mount design, which frees up your home’s real estate space, only increases the money customers will save. And, Navien’s 15-year warranty is the best in the industry—think of it as an added bonus!


Space Saving

Best Warranty