Navien NR Condensing 98 Residential Tankless Water Heater Review

The Navien NR Condensing 98 residential tankless water heaters are available in three base models, the NR-180, NR-210, and NR-240. Navien offers a unique add on option for a built in tank and recirculation pump to each of these models by adding the suffix “A” to the model number with the NR-180A, NR-210A, and NR-240A models. A common complaint among tankless water heater users is the wait for hot water each time you turn on hot water at a faucet and the lack of hot water at low flow rates too low to trigger the tankless unit to fire. The built in tank and recirculation eliminates this problem by having hot water in the piping close to your point of use at all times. The Navien NR Condensing 98 residential tankless water heaters offer an efficiency of 98%, which is achieved by using a modulating burner in conjunction with a condensing heat exchanger. The modulating burner fires at a variable rate adjusted by how much heating is needed to heat the water you are using without wasting fuel in a process very similar to using the accelerator pedal in your car adjusting to the flow of traffic. The burner is a premixed burner where the fuel and air are mixed in a fan with precise mixtures of fuel and air to maintain a very clean efficient burn that is very low in the output of NOx and CO2, which is a component of smog and global warming. The condensing heat exchanger utilizes the heat of the discharging flue gases to preheat the incoming cold water soaking so much of the heat out of the flue gases that moisture in the gases actually condense to water which is then used to absorb NOx and when discharged help neutralize alkaline sewage from the home. The Navien NR Condensing 98 residential tankless water heaters are recognized as an energy saving green technology and are eligible for rebates, grants, and even a 30% income tax credit up to $1500 under the programs of the American Recovery and Reinvestment Act of 2009.

The Navien NR Condensing 98 residential tankless water heaters feature a stainless steel heat exchanger which Navien claims is up to 4 ½ times more life and resistance to erosion over the copper heat exchangers used by other manufacturers. The Navien NR Condensing 98’s also have a cool flue gas discharge, which can be discharged through PVC, a three stage premix burner controlled by dual microprocessors utilizing air pressure and gas pressure sensing to provide the optimum fuel/air mixture modulated to your exact needs.  The dual microprocessors also monitor safety functions and tests themselves as well. The Navien NR Condensing 98 residential tankless water heaters can be fired on either Natural Gas or, LP Gas with an easy conversion when setting the unit up. The “A” models feature a built in tank and recirculation pump which can provide instant hot water at fixtures through out the home at any flow level without having to flow a minimum amount of water to fire the unit and waiting for the unit to detect a flow, fire, then the heated water to travel through the pipes to your point of use, units without the recirculation feature require a minimum flow of 0.5-gpm to fire the unit. The NR-10DU remote controller has a backlighted LCD screen, which reads out diagnostics and error codes as well as controlling temperature and recirculation times with inputs via pushbuttons, which can be locked out to prevent unintentional changes. Multiple units can be interconnected in a cascade system to provide virtually any amount of hot water flow you need. The Navien NR Condensing 98 residential tankless water heaters in residential installations are provided with a 15-Year Parts Warranty on the heat exchanger and a 5-Year Parts Warranty on other components, also provided is a 1-Year Labor Allowance.

The Navien NR Condensing 98 residential tankless water heaters three base models have different capacities.

  • The NR-180 fires from 15,000 to 150,000 Btu/h, measures 17”W X 28”H X 14”D weighing 67 lbs. with the “A” model weighing 77 lbs. The NR-180 can produce 3.8-gpm with a 77-degree F temperature rise up to 8.3-gpm with a 35-degree F rate of rise.
  • The NR-210 fires from 17,000 to 180,000 Btu/h, measures 17”W X 28”H X 15”D weighing 77 lbs. with the “A” model weighing 86 lbs. The NR-210 can produce 4.5-gpm with a 77-degree F temperature rise up to 10-gpm with a 35-degree F rate of rise.
  • The NR-240 fires from 17,000 to 199,000 Btu/h, measures 17”W X 28”H X 15”D weighing 77 lbs. with the “A” model weighing 86 lbs. The NR-240 can produce 5-gpm with a 77-degree F temperature rise up to 11-gpm with a 35-degree F rate of rise.

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