If the heat power is unknow you can calculate it in two different ways:

• Tank temperature increase: start up your system without a cooling unit. Measure the initial temperature (lower) of the liquid in the tank. After a time lapse measure the final temperature (higher) of the liquid in the tank. Measure the time lapse.
• Existing cooler: measure the liquid inlet and outlet temperature on your current cooler and the liquid flow.

Close circuit: hydraulic circuit composed by tank, pump, heat source and cooler. The software calculates the temperature of the circuit in stationary regime

Open circuit: hydraulic circuit composed by pump and cooler. The software calculates the outlet temperature with fixed inlet temperature