Power Vent Gas Tank Heaters 74% - 98%
 Power vent tank type water heaters use a electric blower to exhaust the flue gases which helps create better combustion which drives better efficiency. Standard power vent water heaters are about 74% efficient, new technology has improved efficiency by transferring the heat from flue gasses to the water in the tank. In regular atmospheric heaters this heat would lost to the atmosphere, these water heater can be 98% efficient. The negative to these water heaters is that they are condensating, Condensating means that little drops of water are formed in the flue as it leaves the water heater this condensation must be drained to a safe place, such as a drain or flower bed. This type of water heater can produce more hot water faster.
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Gas water heater efficiency is based on how much energy from the gas is transferred from the gas to the water. A typical tank type water heater is about 62% efficient. Recent water heater technology has improved the efficiency rate on some standard water heaters up to 70%.
Tankless and Hybrid water heaters generally are in the 90 - 98% efficiency range and provide unlimited amount of hot water. The other positive is that when the water heater is not in use it does not use any gas, this is desirable for properties that are not used for periods of time like weekend homes.