Gas hot water heaters tend to be a lot more efficient than gas cooktops. The flat bottom of most pots and pans means a lot of heat will escape up the sides, but hot water heaters can be designed with this in mind. On pots, I have one that basically has heatsink fins on the bottom to better capture the gas heat, but this is far from typical.
Gas hot water heaters tend to be a lot more efficient than gas cooktops. The flat bottom of most pots and pans means a lot of heat will escape up the sides, but hot water heaters can be designed with this in mind. On pots, I have one that basically has heatsink fins on the bottom to better capture the gas heat, but this is far from typical.