We replaced an old single thermostat water heater with one that has two
If I want raise the water temperature a little, should both thermostats be
set the same or is there a convention for setting them at different temps?
For most purposes, the top element should be set somewhat lower than the
The top element mainly serves to give you relatively quick recovery. The
lower element brings the entire take up to temperature.
Thus, if I wanted to raise the temperatue I would just adjust the lower
thermostat. Another advantage is that there are less wires on the lower
thermostat. If I wanted to lower it from the "factory setting" I wold
lower both elements. No point in having the "quick recovery" water be
hotter than the "full tank" temperature.
No shit Sherlock but you dont set them at two different temperatures.
Never once saw that in writing anywhere.
Now I will say that when you hook up an electric heater to a
Geothermal system you do turn the lower element thermostat to about 90
degrees while keeping the upper at its normal setting but thats not
even close to what you are thinking about there............."Skippy"
Leaving those two juveniles to take pot shots at each
Maybe there IS a discussion?
Regular so called 40 US gallon tank. Upper and lower heaters.
Presently wired in regular 'flip-flop' manner.
Consider different 'demand' situations.
Situation 1). Single resident very low hot water demand. Amount of hot
water for each demand easily satisfied by top portion of the tank.
Argument: Set lower thermostat lower. It will somewhat pre-heat the
colder water that enters down the entry pipe which will sit in bottom
of tank until it rises into the upper part as the hotter water there
is used to be heated further by the upper heater/thermostat? Don't
suppose one could argue that the lower heater be turned very low, or
even 'off' entirely?
Situation 2) Same set up, high demand. Argument: Set both thermostats
same so whole tank is full of water at same temperature. If lower
thermostat was/is set higher than upper the lower heater would
eventually heat all the water in tank to its (higher) setting.
Situation 3) Faster recovery. Only had this situation once. We had
three Americans who visited in a motor home. Even though we were on a
well and it was mid summer in a dry year they seemed to have no
concept about water use/conservation!
So in a successful attempt to have sufficient hot water recovery with
our regular set up, with three extra users, the wiring was changed so
that both heaters would come on, each under control of its individual
thermostat (Move one wire). Fortunately had wired with #10 AWG (30
amps) so that if/when both 3000 watt heaters were on drawing 26 amps
there was no problem.
Arguments/discussions/comments (especially humorous ones) welcome.
Schoolyard variety rhetoric will be ignored!
BTW have previously estimated, in the face of those Europeans and
other advocates of 'Instant Hot Water' installations (which on gathers
can take up to 19 kilowatts for short periods?) that the amount of
heat lost from a typical insulated hot water tank (or cylinder) is
extremely small. Also that here, where we heat most homes electrically
that so called 'loss' helps to heat the residence for quite a few
months of the year. Some people use electric furnaces especially as
replacement for an oil furnace. Thus eliminating the oil tank, oil
piping, the furnace, chimney and various annual maintenance.
Have fun anyway!
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