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Efficient way to boil water with low voltage?

i am looking for a way to boil water at low voltages (around 10 volt DC) steam would be used to power a steam generator connected to a dynamo. i need around 125 psi

what method should i use to heat up the water? i was thinking of using. nicrome or induction
we currently have a solar panel that produces 12.5 volts of electricity on a food day. but solar in not more efficient by any means steam can produce more electricity because i can use a gear system to produce different amounts of electricity and if coupled with a low friction dynamo i can get a 12in fly wheel to produce 120+ volts of dc power at 4,000 RPM.

Please only leave answers that are relevant your flash light will not solve my problem
sorry 40,000 RPM