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heat will flow from the iron to the water until both are the same temperature
That's going to depend on the temperature of the water before you heat it, and on how hot you want it to be when you're done.
You would need to remove approximately 1200 BTUs of heat to convert a gallon of water to ice. There are 8.34 lb in a gallon of water, which converting to lb-moles is 0.463. The latent heat of crystallization for water is -2583.4 BTU/lb-mole. Multiplying the two together and you get -1197 BTUs, which means you need to remove that amount of heat to convert the gallon of water to ice.
"Watt" is a rate of moving energy. The more watts you use, the faster the waterwill heat up. The fewer watts you use, the slower it will heat. If you can affordthe time to wait, then any amount of power will do the job, no matter how small.
answer: 7680 btu 1 gallon= 8 lb 130F-50F=80F 12G*8LB*80F=7680 BTU