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If you wanna store heat...
... then there are better solutions than just plain water like a container of salt with a high melting point; when it cools down the solidification yields a lot of extra heat.
You could keep the installation lighter and smaller for the same capacity, or get more capacity for the same weight.
Of course systems like these have been discussed before at ecomodder
(just rubbing my 2 grams of salt into the discussion)
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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