The most common challenge faced with a tankless water heater is when the water flow exceeds the power capacity of the heater resulting in reduced water temperature. To solve this issue, Eemax™ created a simple fitting that threads on the outlet side of the heater. The fitting contains an insert which limits the flow rate at a chosen level while causing almost no pressure loss below that level. With the inline flow regulator installed, the Eemax™ heater will provide the desired output temperature regardless of the number of hot water outlets opened.