Is it true that electric hot water heaters run at far less efficiency as
they age(like me, I guess). If so, is that in the design or just inevitable
e.g. corrosion, buildup on the elements, etc.? Are there more efficient
heaters available? These days it appears that 5 yrs is the life expectancy
of most of them
Electric water heater efficiency is 3.413 BTU/Watt. That conversion
factor does not change with age of the heater. If the power is going
in the heat ends up in the water. It has nowhere else to go! With a
gas water heater, there are flue losses, some of the heat goes into the
water and some goes up the flue. As a gas water heater ages, soot and
corrosion and lime build up on the heat exchange surfaces; then more
heat goes up the flue & less into the water, so the efficiency drops.
As for warranties, my brother is a full time plumber. He commonly
sells tanks with 8-10 year warranties. Look around.
Gas get less efficient with age not electric. Electric for most everyone
is more expensive per btu. Electric for me in the midwest is 3x the cost
of gas If you have gas heat consider gas your utility bill will show
you Ng and Kwh costs, I junked my electric for gas.
No, it is not true. An electric water heater is
always 100 percent efficient. The heat has to go
somewhere and it goes in the water. If you are
referring to insulation, then yes it could
deteriorate some and allow more heat into the room
instead of staying in the water. But over the
heater's life time you would never notice the
And no, a heater lifetime is not 5 years unless
you live in a place that has severely corrosive
water. Not sure if you mean the water heater or
the electrical element. Elements in our hard
water area commonly last 10 years or more, but
some do fail as early as 4 or 5 years.
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