Noritz tankless water heaters come in a wide variety of sizes and flows depending on your residential or commercial needs. For continuous hot water at home, you can get as much as 5 gallons per minute all the way up to 9 gallons. That equates to 300 to 540 gallons per hour.
The Noritz tankless water heater also can be installed both inside your home and outside (some models are inside only and need to be vented).
Some of the newer models that Noritz has produced even recycle the hot exhaust gas to pre-heat the incoming water. The result is that these models are 93% efficient. And as an added bonus, the exhaust gas is much cooler so that you can use PVC pipe to vent the gas.
One thing to remember when selecting the proper Noritz tankless water heater for your application is that the temperature of the ground water affects the flow rate of the unit. So, what is recommended is to get a certified plumber in your area help you select the proper model of tankless water heater for your climate. And remember to use the temperature in the winter as your guideline.
One more consideration before buying your Noritz tankless hot water heater is the peak hot water usage in your home. It's easier to think of all appliances using about the same amount of hot water (shower, dish washer, washing machine, etc). Then you need to use your winter ground water temperature to plan for the 'worst case scenario'. For example, if your winter water is 45 degrees, you may only get the equivalent of one or two uses at the same time. This may mean you will need to get a larger unit just for those winter months so that it can provide the amount of hot water that you need.
No matter what Noritz tankless water heater you chose to get, you can rest assured you are chosing one of the best and most efficient brands available.