Takagi TK-RE02 Remote Temperature Controller is an optional upgrade for takagi tankless water heaters which allows you to: · Override factory settings to set-up the desired water temperature · Control the water heater remotely if it's installed in concealed or hard to reach places · Monitor water flow and incoming / outgoing water temperatures · Monitor any errors Available temperature settings for the Takagi TK-RE02 are: 95 100 102 104 106 108 110 111 113 115 117 122 131 140 158 and 167F This model also replaces an older model TK-RE01. Takagi TK-RE02 is compatible with the following tankless water heaters: T-KJr T-K3-OS and T-K3-SP.[]