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Thread: No water in shower?

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  1. #1
    DIY Junior Member carzt's Avatar
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    Default No water in shower?

    I'm renovating an existing house which I don't yet live in. The bathroom was just redone (including new pipes) by a professional plumber. There is quite good water pressure in the sink, light pressure in the rain shower, and just a very slight trickle in the shower and bathtub. The plumber says the pressure is too low, and suggests a water pressure tank. Note this is in the Philippines.

    I've included a diagram of the plumbing below.

    Is it likely that the lack of water in the shower/tub vs. the sink is just low pressure due to the additional elbows in the pipe going to the shower/tub (8 elbows) vs. to the sink (5 elbows)? How can I estimate the additional pressure required (and thus whether a pressure tank will help and what I should get)?

    Thanks for any advice,

    Chris

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  2. #2
    Moderator & Master Plumber hj's Avatar
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    With low pressure elbows have negligible effect on the delivered pressure. We would have to know more about your system, such as whether it is a gravity system using a tank on the roof, or where the water comes from. A "pressure tank" does not create pressure, so it will not help unless you have some way to pressurize it, such as a water pump.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member carzt's Avatar
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    The water comes directly from the main water utility pipe. No water tank on the roof.

    If we get a pressure tank, it would of course be accompanied by a pump to create the pressure

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    The size of the pipes and the actual pressure you have will determine how much water you can get there. If the pipe diameter is too small, or the pressure is low, you cannot provide enough volume to do what you want. Now, how many heads are you trying to run in the shower at once? That may be an issue with the valve chosen...it might just have too small internal passageways to provide the desired volume at a nice pressure.

    I dont know how easy it would be to find, but a pressure gauge is the only way to actually tell what your supply pressure is. In the USA, you can pick up a reasonable one for about $10US. As HJ said, the number of elbows probably isn't an issue, and if it is, its effect is small.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    They do make products that increase water pressure, typically and tank and pump combined to boost the pressure.

    A few fittings on the way to the valves isn't causing your problem. You may want to try flushing the lines though. Have you put a pressure gauge on the system to find out what your static pressure is?

  6. #6
    DIY Senior Member bluebinky's Avatar
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    Maybe some kind of obstruction got into the mixer or diverter valves?

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