Why Does My Hot Water Heater Run Out of Hot Water?

Assuming the municipally-supplied water is coming into my home, why can't it be continuously hot as it passes through a heating element on the way to the bathtub or shower?

7 Answers

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  • elhigh
    Lv 7
    2 months ago
    Favourite answer

    It can be continuously heated.  So-called "instant" water heaters are readily available.

    The larger electric models, at full output, can consume as much electricity as the entire rest of the house, so be warned.

    Gas models are somewhat easier to live with and can be installed with vent systems that don't require they be next to an exterior wall.

    They all have non-optional regular maintenance needs.

  • ?
    Lv 7
    2 months ago

    You must have a small waterheater one, so you need to purchase one that hardly ever runs out of hot water.

  • 2 months ago

    the rate at which the heating element in a typical hot water heater does its thing [heats water] is less than the rate at which you use it.

  • Anonymous
    2 months ago

    when was the last time you opened the relief valve and blew out the mud  built up in the bottom ? 

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  • 2 months ago

    A typical tank water heater does not heat instantly. That's not how they work.  You need the new types that install near the fixtures without a tank for that.

  • Anonymous
    2 months ago

    If your heat exchanger is not an instantaneous type it will not heat the water continuously. Most modern combi-boilers will provide instant hot water (after the water in the pipework from appliance to boiler has been run off) for as long as you want to serve a shower for example. 

  • ?
    Lv 7
    2 months ago

    Because the water coming in is cold (ambient temp) water and the heating element in the water heater is a slow heating unit. It's designed to heat a tank of water, not a flowing stream. 

    If you want water that is hot all the time, you need one of the tankless water heaters. They're a lot hotter than the heating element in the water heater so they can heat the water as it flows past. 

    They're also good on energy consumption since they're not heating water that's just sitting in a tank. It only comes on as needed. 

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