. G e n e r a l l y, natural gas water heaters have higher first-hour recovery rates than electric water heaters with the same storage capacity, so when you buy a gas water heater by its first-hour recovery rating, its tank size is usually smaller than a similar electric water heater’s tank.
States. EFs for natural gas water heaters currently range from 0.43 to 0.86, with the mid-size models ranging from 0.52 to 0.65. Note: While electric water heaters have higher EFs than gas water heaters, that doesn’t mean they will be more eco- nomic to operate, because electricity costs considerably more than natural gas for the same amount of energy.
2 years, the higher efficiency model would be the better choice for long-term savings. Installation and Venting All natural gas water heaters must be vented to the outdoors to remove the byproducts of combustion. Aw i d e variety of venting options are available, and should be considered when you choose your equipment.
• If your dishwasher has a "booster" heater for its water supply, you can use it and set your water heater temperature at 120 degrees F. T h a t ’s hot enough for all other household uses. For each 10 degrees you reduce the temperature setting, you’ll reduce energy use by 3 to 5 percent, according to DOE.