Noritz has release a new tankless water heater, the N-0842MC series. The unit features condensing technology that increases efficiency to 93%, it also sports a 100% stainless steel heat exchanger.

The temperature stability, flow rates, and water pressure are currently unmatched by an other condensing tankless water heater. Definitely recommend that you consider this unit for any home installations.

Note: Since this is a condensing tankless, the exhaust gases are significantly cooler and thus conventional PVC pipe can be used for venting. This is significantly cheaper than the current stainless steel vent requirements of non-condensing units.