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hot water pressure is equal to cold water inlet pressure
check for tap restriction, hot water section free of air , ( release the pressure valve ;lever to fill and bleed out air)
if you have a hot/cold mixer at the hot water system, they can fail and block of the hot water flow
(That unit has to be fitted by law on heater installation)
have it tested first as they cost in excess of $15.00 aud to replace
most electric hot water systems use a heat transfer process where the element is in one tank and the house water is in another
the house water is what is being drawn off when you turn on a tap
there is a regulator valve at the top of the tank with a small lever that you open up to let water in and air out of the system
another point is that there may be a hot/cold mixer on the hot water outlet which limits the temperature of hot water to prevent scalding injuries in the bath and shower or sink
If you have one fitted they are known to malfunction and cut the hot water temperature down as, they mix too much cold water into the hot water pipe.
have a plumber check it out
Sounds like water leak.
For example, broken pipe... or water running out of TP valve.
That would explain variable hot-and-cold water at tap.
Turn off all taps, and observe if water meter is registering water usage.
Tanks are marked with Hot and Cold. 1) If water connections are on top of tank, look for red marking or word HOT that shows where hot water pipe connects. Look for blue marking or word COLD that shows cold water connection. 2) If water connections are on side of tank, cold water connects to bottom one, and hot connects to top.
3) If hot and cold are reversed, the tank will not work. Pipes on top of tank: cold water enters tank and is sent to bottom of tank in a long tube called the dip tube. This means the cold is on the bottom since hot water rises to the top. The hot water exits top of tank. Pipes on side of tank: You want cold water to enter bottom, so hot water naturally rises to the top outlet.
Make sure that the water pipes for the cold water coming in and the hot water going out are connected to the correct positions on the water heater. If the connections get reversed, the water that is supposed to be hot will be drawn from the bottom of the tank and will not be as hot as it should be. The cold water input goes to the bottom of the tank. The hot water out comes from the top of the tank.
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