dishwasher, hot or cold?

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    • #274503
      jcotter

      Does it matter whether I hookup to hot or cold for dishwasher? Instructions say cold water but I’ve also been told hot water. Which is correct?

    • #289859
      Rick
      Participant

      It actually could be either. Some dishwashers have their own heater that heats the water to proper temperature, some don’t. If you have electric water heater and you are sure the instructions say use cold water, you can probably use cold. However,until this year, if you have a gas water heater, it is cheaper to use the gas to heat the water. If however, the dishwasher does not have its own heater, you are going to be washing dishes with cold water, unless you hook it to hot.

      Either way, you cannot go wrong hooking up to the hot water piping. If the DW has its own heater, it will not have to heat the water as long, if it already comes in hot.

      Good Luck,

      Rick

    • #289860
      fourth year
      Participant

      The only time Rick’s advice might be incorrect is if the manufacturer has some component in the water feed that will be damaged by hot water passing through it.

    • #289861
      Rick
      Participant

      And I cannot imagine any manufacturer designing any component that would be damaged by hot water. It is a dishwasher, intended to be operated with hot water, followed by hot air circulated for drying. Heat transfer by thermal conductivity, radiation, and convection from normal dishwasher operation would certainly raise the temperature of any wetted component to at least that of the water from the hot water heater.

    • #289862
      fourth year
      Participant

      If the manufacturer specified cold water then they could have installed a plastic component that was not suitable for hot water. And since the fill system is external to the dishwasher tub itself, the components would not be subjected to the higher temperatures. As I originally stated, using hot water is the most common connection, but the caveat would be why the mfgr. specified cold water.

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