This is essential for the heater to function properly and to avoid a fire hazard. Many new water heaters come with very high insulation levels, reducing the economic advantages of adding an insulation blanket. In fact, some super insulated models recommend not adding a blanket, so double-check the manufacturer s recommendations as the blanket may void the warranty in some cases. Insulation blankets can be found in hardware and home stores. Be careful not to insulate too close to intake or exhaust vents on gas water heaters.
Higher temperatures increases the rate of corrosion on internal fittings and other surfaces.
Hot tap water is a scalding hazard, especially to children and seniors. Scalding occurs in 2 seconds at 150o F while it takes 10 minutes to be scalded by 120o F water. A great deal of energy and water is wasted while waiting for the hot water to reach the tap. Insulating your hot water pipes will reduce heat losses as the hot water flows to your faucet, and it will reduce standby losses when the tap is turned on more than once within an hour. Even with insulated pipes, the water will eventually cool, but it will stay warmer longer than it would if the pipes were not insulated.