Consumer Reports tested Takagi and Noritz gas-fired water heaters that ranged from $800 to $1,150. Consumer Reports tested Takagi and Noritz gas-fired water heaters that ranged from $800 to $1,150. Lowe's listed several gas-heated models of Bosch tankless water heaters that ranged from $432 up to $1,489. Lowe's also listed electric tankless water heaters that ranged from $236 to $699, though their heating capacities were significantly lower than those of the natural gas models.