So you have water in the two 1000 l reservoirs with an average temperature of ~18 degrees (Celsius).
Output temperature was 104.5 C average. I don't give a damn about steam. I presume the boiler wasn't operating at sub-atmospheric pressure, right? So let's just say that the water was heated to at least 100 degrees. 3716 liters of water flowed, came in at 18.3, came out at > 100 and cooled down before going back into the reservoir, since the average temperature was 18 degrees. So delta T is > 80 degrees. With a heat capacity of 4.2 kJ / kg / K we get : Q = 3716 kg × 4.2 kJ / kg / K x 80 K = 1.25 GJ. Genset output was 66 kWh ie 238 MJ. So that's 1 GJ of excess heat. -- Berke
