Originally Posted by davel1971
I've never had one that is adjustable. Anyone know if any are or if you can get an adjustable thermostat?
As Dan said, few are and none would cause this coldness of water. That is almost definitely a sign of cold water mixing with the hot IF the water in the water heater is hot. Have you tried letting water come out of the relief valve to see if it is cold or hot? If it is hot, your water heater is fine. If it is cold, then you're looking at a thermostat, heating element, or other problem.