Can anyone give me a few pointers to calculating the time take for an electric shower to reach it's set temperature?
The set temperature is actually a power setting and a flow rate setting.
I know that with 3500 watts of heating power and a flow rate of 3.5 litres per min, I will get a 14.35 degree rise.
3.5 l/min = 58.3 g/sec
58.3 * specific heat of water 4.18 = 243.8
3500w / 243.8 = 14.35 degrees rise
So my question is, is it possible to work out the time taken to reach this temp? I assume I need to know something about the efficiency of the heat exchanger to calculate this as well as the specific heat of the materials between the heater and my measurement point?