What is temperature rise?
The maximum flow rate that our tankless hot water heaters can produce depends on temperature rise — the difference between the set temperature of the unit and that of the incoming groundwater. For instance, if you set the temperature of the unit to 120° F and the incoming groundwater temperature is 60° F, then the temperature rise is 60°F.
The lower the set temperature, and the higher the incoming groundwater temperature, the more hot water flow the unit can produce. If sized correctly for your application, the unit(s) won’t have a problem producing enough flow for all of your hot water needs.