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Put that water in a glass and let it sit for a couple of hours. If it clears up, it is air bubbles. The old unit most likely had mineral deposits on the elements and they insulated the water from micro heating that creates the bubble. Since the unit is new, the water is in direct contact with the heating elements and micro bubbles are forming on the elements. When you turn the hot water on, the turbulence washes the bubbles out.
Doesn't sound like its the dip tube, its a element problem, I would contact bw directly to see if heater is stil in warranty and they will send you new parts free.
The next thing you need to do is find out whether you have 240v to the bottom element....the top will not heat till the bottom is satisfied... An electric meter is critical when working with these units....trace the power and see where it stops....
Check the elements, if you have access to a meter to check them. If they are getting power to elements and you have no hot water.
The elements are not working correctly. I had some elements check out ok till the thermostat's turned on and the elements didn't heat.
Sounds like the elements are bad.
If the lower heating element burns out the upper element will heat the top part of the tank then shutoff.
homw depot/lowes etc should carry elements.
1 turn off breaker, remove element access cover (the 2 panels on the front of the heater) test for electricity at the reset button ( uppermost device in upper panel) to make sure power is off.
2 turn off water (I usually turn off the cold water main to stop water cross feeding into hot supply line back into heater)
3 disconnect the 2 wires on the lower element, test with continuity tester. shhould be no continuity between terminals and tank, but around 10 ohms between the 2 terminals.
Check the thermostat for continuity if tank is cold thermostat should be closed ie zero ohms across the 2 terminals.
If stat is bad replace stat; disconnect wires push it up out of the spring clip insert new stat reconnect.
If element is bad:
drain tank.
connect garden hose to tank drain valve, open tank drain valve turn water main on to clear rust sediment and get water flowing.
Next remove filter screen from a hot water faucet then turn on ( a hot faucet upstairs or higher than tank drain). Now turn water main off, air will now go in through hot faucet and tank will drain, takes about an hour.
Use a water heater element wrench about$10 to remove element(s)
make sure no bits of rubber gasket are left in element opening- dig em out with a screwdriver if needed.
Insert new element with its gasket and tighten.
reconnect wires
DO NOT TURN ON ELECTRICITY!
BE SURE TO FILL WATER HEATER WITH WATER !
Turn water main back on -air will come out of the hot faucet for several minutes. When water runs without any air sputtering, turn off faucet and replace the faucet filter screen.
check element(s) for leaks.
turn breaker back on.
needs new thermostat(s)
If the whole tank is heating( next time it trips, before using any hot water check the lower tank thru the lower element access(breaker off) If the lower tank is hot-you need a new lower thermostat. if just the upper part of the tank is heating -you need an upper thermostat.
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