How is FHR and Therms used to compare the efficiency of water heaters?
What efficiency standard does a dual use residential water heater need to meet as a water heater or a boiler (used for both potable water and space heating purposes)?
What is a hot water recirculating system?
How do I choose the best electric or gas tankless water heater for my home (2300 sq. ft.)?
Are tankless water heaters more efficient?