SOURCE: hot water not heated as usual ?
This could be one of your elements are bad and now that the weather is cooling down so is the water table. If you have a gas heater your thermostat is becoming weak and/or there is settlement on the bottom of the tank and will need to be drained while heater is off to remove settlement. The same with an elec. heater one of the thermostats could be bad and not allowing the heater to recover fully also again settlement in the tank can be a factor.
SOURCE: not enough hot water. I have an Amtrol Extrol coil water heater
Since you mentioned 'both temperatures' it seems your unit is like most all of them, a lower and upper coil.
If your hot water supply runs out quickly, this normally means that the lower coil has failed.
Since heat rises, the upper coil will never supply a tankful of hot water, just hot to start, and then as the flow continues, it doesn't have time to do more than warm the water flowing into the tank.
Every home should now own a simple digital multimeter; they cost less than $20 US everywhere and one can find them in auto parts stores, electronic supply companies and tool companies.
If you have a Harbor Freight tool store in your area, you can get them for under $10 US any time and sometimes even less:
Digital meter
You need to be absolutely certain that the voltage to the water heater is shut down.
Before you measure anything else, set the meter to its highest AC setting and check across the coils and then from either contact to the metal housing.
If it is dead everywhere, then set the meter to the lowest Ohms scale (normally 200).
The resistance of the coil should be nearly the same reading as when you simply short the meter's probe tips together.
If it measures 'OL' then the coil is open and must be replaced.
SOURCE: No hot water
The code # 11 is a code that warns of "no ignition" and the causes of this error code are too many to list. I would suggest that a qualified tech. perform a diagnostic test and repair.
This is not a task for the "do it yourselfer"
SOURCE: how do you change the temperature of a vulcan hot
which ever one has the temp on it would be the one,, is it gas? or electric? if gas it would be on the gas valve ,, if electric it will be under the cover where the elements are
SOURCE: Rheem Gas Hot water Heater; Model 21130DV:
yes, sounds like the temp control is bad, you should be able to google model# and thermostat to find replacement. should be fairly easy to swap out
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