1. The problem statement, all variables and given/known data A tank contains 125 litres of water. If it's temperature is 20C, how long would it take for a 2kW immersion heater to raise its temperature to 60C if the average rate of heat loss is 150W? 2. Relevant equations I am using the specific heat capacity equation: ΔQ = mcΔT 3. The attempt at a solution ΔQ = 125 x 4200 x 40 = 21, 000, 000 J 2kW = 2kJ per second. Concerning Heat Loss: 2000W - 150 W = 1850 W = 1.85kW 21,000KJ = 11, 351 seconds. 11, 351 / 60 = Approximately 190 minutes. I kind of get the feeling I'm not right. Any tips? Would be appreciated.