What is cheaper to run gas water heater or electric water heater?
gas heater is cheaper by far !!!!!!
This is entirely dependent on the cost of energy in your area.
Talking from experience, we installed a Titan Tankless N180 electric water heater 8 months ago and it uses approx. 300kw of power with an approximate cost of $50 per month. We have 5 members in the family, and live in Southern California. My best estimate from a comparative analysis on the gas savings is we're only saving between $10 to $15 per month. Electric water heater seems to make sense for vacation homes or where gas is not available.