That is usually an indicator of a leaking tank, but if the elements have been changed recently, it may be leaking from there. If it's the element, I suggest a 11/2" socket rather than a cheap element wrench to tighten it. Most heaters have a 6 or 12 yr warranty,so if it leaking, you will get a replacement.
SOURCE: Hot water heater leaking at the top valvue
I believe the problem you had with the pop off valve is a one time thing since you said you just installed the water h eater
The pop off valve is a pressure relief valve that is activated by build up in the tank from excessive pressure either through too much heat or pressure which works by pressing aginst a spring loaded valve
If you go to the whater heater and look at the valve ther is a handle on it take your hand (stand clear of valve opening) and slowly pull it you will see water start to come out
More than likely a new valve could have had a piece of debris in it or was partially open
re
If the heater was overheating the valve would stay open and you would see extremly hot water rushing out
I do not recommend that you replace the valve unless it continues
Good luck to you
SOURCE: water heater not heating it's a richmond water heater
Now change the thermostats........this is the only other thing it could possibly be.
SOURCE: i have a richmond gas hot water heater model
resetting your lock out for richmond power vent
SOURCE: Rheem 83xr52-2 50 gal residential water heater.
You can open the top up again. I would not turn the temp higher than 130 degrees, maximum. However, there should be above the thermostat a red button. This is where the power wires connect to the thermostats and heating elements. Sometimes this button needs to be reset, press it and discern if you hear a click sound. This means that the high temperature safety switch has tripped open and you had to manually "reset" it. There are two thermostats by the way. The water heater usually works this way. There are two thermostats and two heaters. The upper tank heater turns on first and it heats the top half of the tank. Then when the thermostat above is satisfied it then allows the bottom heater to come on and heat the bottom half of the tank. You might want to set the bottom heater thermostat as well. This is made this way because it is actually faster and more efficient to heat the top half first and the bottom half secondly. Try this first with the reset button. We could check voltages, but that requires a level of knowledge and safety that I am not sure that you are comfortable with. Pictures of the upper and lower thermostats and connections will help if the "reset" does not do the trick. By the way, not meaning or implying anything, but did you move the thermostat in the right direction? Sometimes the dials can be confusing.
SOURCE: How can I get an owners manual for a Richmond's
Try this link.
http://demandware.edgesuite.net/aabh_prd/on/demandware.static/Sites-Appliance-Site/Sites-CompactAppliance_Primary/default/v1298033256538/pdf/ownersmanuals/rheem/RTG74IndoorOutdoor_owners.pdf
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