A watt is a unit of power (Joules/second: energy / time). I guess it depends on what method you are using to get energy out of the water, as to how much energy is in it.
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The energy content of a gallon of salt water would depend on the concentration of salt in the water. On average, seawater contains about 3.5% salt. Using this concentration, a gallon of salt water would contain very minimal energy in the form of trace amounts of potential thermal energy due to the dissolved salt. It would not be practical to extract energy from a gallon of salt water in this context.
"Watt" is a rate of moving energy. Anynumber of watts can heat your liters,but the less watts you use, the longer the job will take.
There are 768 teaspoons of water in one gallon.
The amount of energy required to freeze water depends on the initial temperature of the water and the desired final temperature (0°C for freezing water). To calculate the power in watts needed to freeze water, you would need to know the mass of water, its initial temperature, and the time over which you want to freeze it.
Do you mean how many watts are used to make hot water? It varies, but a typical home electric hot water heater consumes about 4,500 watts. Industrial hot water heaters might use 20,000 watts or more! I have a little warmer that keeps my coffee warm as I type this, it consumes about 300 watts. Of course it only heats 6 ounces of water....
You can't convert that.* A BTU is a unit of energy. * A watt is a unit of power (energy per unit time).