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What size pipe used to run the shower ? The smaller the better use half inche,,,,or better yet 3/8 if you know how to install it.Your pressure will go up as pipe is smaller.
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It sounds like you may have a problem with the water pressure for the rear wash setting on your Toto Washlet. Here are a few things you can try to troubleshoot the issue:
Make sure that the water supply hoses for your washlet are securely attached and not kinked or clogged.
Check the water pressure at the source (e.g., the wall outlet or the valve under the sink). If the water pressure is low, that could be the cause of the weak stream.
If the water pressure is fine, try cleaning the nozzle for the rear wash setting. Sometimes debris can accumulate in the nozzle and cause the stream to be weak.
If none of these troubleshooting steps help, you may need to contact Toto customer service for further assistance. They should be able to provide you with additional guidance or arrange for a service technician to come and check your washlet.
Is the hot water pressure good at other fixtures in the house? I'm guessing your newer valves have a scolding adjustment that is set very low. Check the instructions that came with the valve assembly.
when this problem presents I consider that the problem is in the weak tap stopper /seat
they can break down ,become enlarged and not move of the tap seat to allow full flow
that is the first check I would be doing
Cold water pressure is what give you your hot water pressure so they should be equal but if you have a restriction on the hot side such as a valve not opening on the hot side or not opening all the way then you will have less pressure or the pipe work on the hot side is not proper. Hard to say but check the valve on top of the hot water heater
first time use may be sticking valves inside pump head or poor assembly. run for 10 mins first to see if it fixes itself. then remove cover and remove each valve and inspect, it should be obvious.
reply with pump head photo if more information needed.
When water pressure in more than one place is weak, it means that there is some problems in the water pipe/supply. The chance of having problem in faucet/tap is low. I think you need to get a plumber to check the problem. It may be due to water heater problem or cold water supply problem.
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