Why does my shower water turn cold when a toilet is flushed?

Question by Shiomi Ryuu: Why does my shower water turn cold when a toilet is flushed?
I can be taking a nice, relaxing shower and -BAM!- someone flushes a toilet in another bathroom and the hot water vanishishes. It stays cold until the toilet tank is refilled (about a minute or two). Why does the toilet need my hot water? It’s a cold water device!

I’ve been in other showers at other’s houses, and the water becomes scolding when a toilet is flush. THAT, to me makes more sense, because the toilet is drawing away cold water for itself, leaving nothing but hot. But that’s not the case in my house. Why?

Best answer:

Answer by bearri
i guess it depends on the temperature of your house and your plumbing system…i serously have no idea

Add your own answer in the comments!

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2 Responses to Why does my shower water turn cold when a toilet is flushed?

  1. Nighthawk says:

    If your shower is the instant electric type it may be sensing the drop in water pressure/flow and switching off the heating element as a safety measure to prevent the scolding effect. It sound as if you need to train your housemates to be more considerate.

  2. andy t says:

    ONE OF TWO REASONS.
    INSIDE YOUR SHOWER ARE TWO SAFETY DEVICES 1 A LOW PRESSURE DEVICE THAT DETECTS WATER PRESSURE SO THAT THE HEATER CANNOT BE ON WITH NO WATER INSIDE THE TANK

    2 AN ANTI SCALDING DEVICE SWITCHES OFF THE HEATER IF THE TEMPERATURE GOES TOO HIGH – STOPPING YOU GETTING SCALDED

    WHEN THE TOILET IS FLUSHED, THE CISTERN IS LOWER THAN YOUR SHOWER SO THE WATER FINDS IT EASIER TO COME OUT OF THE LOWER OUTLET, REDUCING THE WATER PRESSURE SIGNIFICANTLY

    [DEVICE1 CUTS IN?]

    AS WATER FLOWS INTO YOUR TOILET CISTERN, THERE IS LESS WATER TO GO THROUGH YOUR SHOWER SLOWING THE FLOW MEANS LESS WATER IS IN CONTACT WITH THE HEATER BUT FOR A LONGER TIME – THUS RAISING THE TEMPERATURE BEYOND THE SAFE LIMIT

    [DEVICE2?]

    HOPE THAT EXPLAINS IT
    LOCK THE BATHROOM DOORS B4 TAKING A SHOWER
    ANDY

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