Extracted from another thread tha had got a bit messy.(adsbygoogle = window.adsbygoogle || []).push({});

The immersion heater in an electric hot water system is rated at 9 kW. If the tank is initially filled with 40 gallons (about 150 litres, with a mass of 150 kg) of cold water at 15 oC, how long will it take the heater to raise the temperature to 40 oC?

Ok this is as far as I have got:

Q=CmdeltaT

deltaT=40-15 = 25

q=Q=4196*150*25

15735000J

Ok so now I need to get time.

p=deltaq/deltat

So to get time do I just say time=p*delta q ???

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# Homework Help: Immersion heater probelm

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