Regarding water heater energy efficiency in Shenandoah TX a few solutions are particularly important. For those seeking a traditional tank style water heater both 40 gallon and 50 gallon models are popular choices. Moreover 40 gallon gas water heaters offer efficient heating with lower operating costs. In general gas water heaters use less energy when compared to electric equivalents. For those interested in tankless options, electric tankless water heaters are a great choice for their heating as needed and energy efficiency. Both electric and gas tankless water heaters eliminate the standby energy losses associated with traditional heaters in the tank style.