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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
a couple of things to check on the side of the hot water system you will see a valve with a small lever
lift that lever until there is a solid stream of water coming from the pipe
that ensures that the heater tank is full
next -if you have a temperature mixer on the hot water pipe out of the tank ( stops scolds in the bath, shower sink) by controlling the temperature mix at the tank
They are known to fail and shut down the hot water supply by adding extra cold water into the system
other than that get a plumber in to fix the fault.
Turn off the water supply from the heater and at the main water supply line outside. place a container under the sink where the flick mixer is mounted to catch the water that will come out of the lines when you undo the fittings.
there should be 2 flexible braided lines coming from the mixer to the water supply lines, undo both fittings from those lines, then undo the brass nut that fastens the mixer to the sink, you may need a 10 or 12mm socket with an extension bar to get up under the sink to be able to undo the nut.
there should be a metal horseshoe shaped retaining plate that holds the mixer to the sink which should come off when the nut is undone.
You may or may not have to remove the flexible lines from the mixer which you should be able to sort out when you get to that point.
I hope this info helps you with your problem, the info may not be exactly how I have explained but that is how most mixers are fitted or removed.
may have a screwed up washer seal on the hot side..it will stop the flow to a degree and allow more cold water in..calls for dismantling the entire control or replacing it..
These units need water flow/pressure to work. If you use a mixer to get the right temperature as soon as you try to increase cold to make the water colder you unfortunately reduce the hot flow. Fairly complicated fault to explain, all continuous flow units have the same flaw. Solution is to try and increase flow and the best way is to take any water filters or restrictors out of your tapware. Most taps have the located in the end of the spout. Unscrew the end and remove any restrictors. Shower roses are a bit more tricky to find. This fixes 99% of these problems.
4yrs isn't very long, but I do believe the mixer needs a new cartridge in it. unless you have a loose knob/handle.But I don't thnk so. The temps should change almost immediatley. Have someone change the cartridge. It may need a special tool. If you think you can, do it yourself, the tool comes with full instructions. Make sure it does, consult with the pkumbing person .
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