SOURCE: extreme hot water then to consistent luke warm
Possible thermostat problem. Are you experienced enough in that area to do some testing. Have a multimeter? If not experienced, don't try it, too dangerous. Call in a service person.
SOURCE: my water is luke warm and then runs cold and then
Its time to replace the heating elements. 90% of the time it's going to be the bottom element, but if you're going to drain it anyway, elements are only $10.00 to $12.00 I would go ahead and replace them both. Replacing the elements is simple just follow these steps.
Step 1: Turn off the power to the water heater.
Step 2: Turn off the cold water valve supplying the water to the heater.
step 3: Drain the water heater there are a few steps to proper draining, connect a hose to the drain port on the lower front of the heater and open the drain valve (remember its gravity drain so downhill all the way) pull up on the pop off handle to relief the pressure in the tank and to let air in so it can start draining also open the hot water valves in your tubs and showers (the more air you can get in the faster it will drain)
Step 4: Undo the 2 wires connected to the heating elements and unscrew the element counter clockwise until it comes out of the tank (they make a socket type tool for removing the elements it's real cheap and can be found at any Home Depot)
Step 5: Take the elements to Home Depot (or any hardware store) and find the exact replacements also get a 1/2" roll or Teflon tape.
Step 6: Teflon tape the threads on the elements (with the threads facing you apply the Teflon tape clockwise) about 4 times around the threads is good.
Step 7: Reinsert the elements into the holes and snug them up tight. (Clockwise) Not supper tight
Step 8: Reconnect the wires to the elements they are 220 volts so there is no neutral either wire to either screw is fine.
step 9: Close the drain valve a disconnect the hose make sure the pop off is closed and turn the water back on leave the tubs and showers on until the tank is filled and air quits coming out of them . Check around the elements for leaks if you see a leak simply snug it up a bit more.
Step 10: Set temp to 125 or whatever you find efficient, replace element covers and turn the power back on and you're all set.
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