Certainly true for older water heaters, but a 15 year old water heater
was made in 1989. I think most decent electric water heaters in 1989
had good insulation. In any case, the amount and quality of the
insulation in a 15 year old water heater is mostly a quality/cost
factor not related to development. Also, retrofit insulation kits for
about $15 are available that consist of a fiberglass blanket. I did
this in the early 80s on my own and due to conservation efforts by the
electric utility which provided the kits for free, I was actually
refunded more than I spent on my homemade retrofit. However, not many
old things can be retrofit, and certainly not cheaply retrofit, to
bring their effieciency up the most current standard.
Hai Pham wrote:
A device that has an encased coil of resistive wire that gets hot when
electricity is applied is pretty basic. If it takes 1500 watts to
heat your water, that means you are using 1500 watts of electricity.
You CAN NOT make heating coils more efficient. If you cut down to
(example), 1000 watts, all you are doing is making the heater run
longer, and create hot water slower. In other words, there is NO SUCH
THING as "more efficient" when it comes to devices that heat using
electric. Of course the advertisers do a great job of marketing to
make you BELIEVE that the new devices are saving power. It's
advertising, and that's all it is. The only way to make a water
heater more efficient, is to make the insulation better surrounding
the tank. If you think your insulation is poor, why replace the tank
when a $10 water heater blanket can be purchased and installed in
minutes using a scissors and duct tape.
It's different with motorized appliances, and cooling appliances.
There are ways to make them more efficient (not that they really do
it). For example, My 1990's refrigerator died last year. I acquired
an old 1940's refrigerator for free. It still runs, is quieter, and
my electric bill dropped about 10%. I was going to buy a newer
fridge, but why..... I got a new door gasket for a few bucks and
other than the fact that I have to manually defrost the freezer, I
have no complaints.
The bottom line. Most of the "more efficient" advertising, is nothing
more than marketing to make sales.
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