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Is there a way (other than collecting water and heating it on the stove ) to get hot/warm water from the tap without having to alter existing plumbing or electrical wiring ?

Perhaps use a chemical reaction to provide the heat to warm the water ?

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  • $\begingroup$ Welcome to Chemistry.SE. This question does not appear to be about chemistry, as defined in our help center. It is likely to be put on hold for that reason. If your intent was to use a chemical reaction to provide the heat to warm the water, we need to know that in the question and it would be on topic. Otherwise, perhaps this question belongs at Home Improvement? $\endgroup$ – Ben Norris Mar 12 '14 at 10:27
  • $\begingroup$ @BenNorris I edited the question to include the verbiage you used in your comment. Hope it is sufficiently on topic now. $\endgroup$ – moonstar Mar 12 '14 at 12:37
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Crystallization of a supersaturated solution of sodium acetate will release heat - once. But then it is just a solid. It works nicely for pocket warmers, but since you have to heat the flexible container in boiling water prior to re-use, this and other comparable processes are of little use for a water supply.

At the end of the day, you won't get around plumbing to tap an energy source.

Your options would be:

  • solarthermal
  • geothermal
  • heat released from the fermentation of organic waste
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  • $\begingroup$ Yes I did think of hand warmers but the idea of pre-boiling it was not appealing. Have you heard of coffee joulies? (joulies.com?) These things lower/maintain temperature. Wonder if a similar thing exists for increasing the temperature of water/fluids. $\endgroup$ – moonstar Mar 12 '14 at 16:12
  • $\begingroup$ You can always dissipate the heat and loose it to the environment, but harvesting energy against a temperature gradient does not work. Putting your feet in a cold creek to warm them up while the water cools down is not an option. Thermodynamics is a harsh mistress ;) $\endgroup$ – Klaus-Dieter Warzecha Mar 12 '14 at 16:25

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