I have an AO Smith FPSH 40 power vented water heater that performs
quite well and is fairly efficient. The power for the vent is supplied
from a line cord and a GFCI-protected outlet. Is there any reason NOT
to install a digital timer switch (the one I have is rated for 10 amps,
several times the draw of the fan) so the unit shuts down at night
rather than keeping the water hot? FWIW the unit has no standing pilot
and the controller is rigged so that the gas supply shuts off if the
power is cut, so there's no probably if it's heating when the switch
turns off...the same thing can be done with the manual switch on the
side of the blower unit in fact.
standby losses are very low with your average foam insulated hot water
I doubt you will reclaim the cost of the timer, and set it to turn on
early enough so your morning shower isnt cool.
For a variety of reasons I have turned my gas tank off over a period of
a day, with no loss of hot water.......
your tank uses little gas or power when someone isnt uing hot water.
please report back your savings if any
Thanks for the info everyone-- not sure if I'll realize (or be able to
track) much savings from this, but since the timer was only $10 it's
worth the effort. I know it runs occasionally at night now, as I can
hear the blower kick on when the house is really quiet. Perhaps I'll
track it for a week using a kWh meter, then set up the timer for
That's how we do it.
There are some digital timer switches that have an "override" button to
either turn on the appliance, or turn it off, w/o actually changing the
program, to "demand" hot water if needed off-program.
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