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GE and Rheem both produce energy efficient water heaters. They each sell different sizes and models. Rheem produces tankless electric water heaters that are affordable and energy efficient.
You can buy water heaters from any home hardware store.
Rheem tankless water heaters are special since they are both energy efficient, and space saving. These water heaters are also innovative due to their small size, since they can fit under sinks and small cabinets.
Indirect water heaters are one of the most energy efficient, low cost water heaters on the market today. It stores 40 gallons of water for the cost of $0.05 per day.
I have no experience in this, however A. O Smith claims that there brand of gas water heaters are the most efficient. They also offer a hybrid water heater.
There is no single answer to this question. Water heaters with Energy Star certification are your best bet. However, the important considerations are what you need. If you get the right size, set the right temperature, and insulate your water heater, that will make more difference than the specific brand. The most energy efficient hot water heaters are tankless. Check your local Home Depot or Lowes for pricing and installation information.
Tankless water heaters are low energy because they only run when the hot water is needed.
Rheem provide a series of high efficiency gas water heaters. Several different companies also provide tank-less water heaters, which are very efficient, as well as solar water heaters.
The Southern California Gas Company offers cash rebates on qualifying energy-efficient upgrades or improvements made to such places as family homes or multi-apartments. You could also qualify for prescriptive rebates for appliances such as a dishwasher, washing machine or a water heater.
Gas tankless water heaters use high-powered burners that quickly heat water as it runs through a heat exchanger. It is 22 percent more energy efficient on average than the gas-fired storage-tank models.
Natural-gas spa heaters are the best for rapid and energy-efficient water heating. Sta-Rite and Hayward are the leading brands for these types of heaters. Look for high BTU output (for rapid heating) and a corrosion-free stainless steel burner.
According to the Rheem website, tall and short tanks have identical energy factors. So replace with the best fit!