In this case, a natural gas water heater is the least costly option, followed by a passive solar system with a natural gas backup. (peakoil.net)
Don't forget to turn off electric water heaters and turn down gas water heaters when going away on vacation. (energystar.gov)
Serving both homeowners and commercial users across the United States and Canada, Noritz America offers four distinguished lines of tankless gas water heaters to meet the varying needs of its broad spectrum of customers. (proudgreenhome.com)