I was listening to a home improvement show today and the host offered an 
interesting way of testing the function of a tank hot water heater.  First 
you wait until the burner of elements have quit heating.  Then go into the 
bath tube with a five gallon bucket.  Run the water until it gets hot then 
run the bucket full and check the temperature with a candy or cooking 
therometer.  Lets say it is 140 degrees F.  Record this temperature.  Dump 
the water and fill another bucket.  At this point leave the therometer in 
the water stream and continously monitore the water temperature.  Measure 
and count the number of five gallon buckets you dump.  When the temperature 
has dropped 30 degrees.  In the case where we started at 140 that would be 
110.  Shut off the water and see how many total gallons have been run out of 
the tank.  If that number equals 70 percent of the capacity of the tank it 
is doing ok.  As in a 30 gallon tank that would be 21 gallons while a 40 
gallon tank would be 28.  If you get more then great if less the problem 
might the tube that directs the cold water to the bottom of the tank has a 
hole or is corroded off or it may be so full of lime you can't even heat 
that many gallons.  Well I thought it was interesting enough to pass on. 
Yes for us it would require a talking therometer and keeping a close watch 
on that bucket so it didn't run over.
Ron 




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