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## Homework Statement

How long will it take to heat 40 gallons of water from 70°F to 120°F with a 20 kW immersion heater assuming no energy is lost the environment?

## Homework Equations

It takes an electric tea kettle with 20°C water five minutes to reach boiling at 100°C. How long will it take for all the water to boil away assuming the same rate of heat addition?

## The Attempt at a Solution

I tried to find BTU to change to kWh. I'm really not sure which equations should be used. My book provides (k x A x (T2-T1))/elapsed time. It also provides Q = mc(change of temp). There's no other equations