i have installed "point of use" water heaters at my faucets....this leaves only the shower. these units cost about $175 each, run on a 110VAC outlet and are really easy to install, provided there is an outlet nearby, such as in the bathrooms. The response for host water is "instant" and you only pay for electricity used to heat the amount of water you use at the faucet.
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Hans
Navy Seabees, Vietnam, All Continents, Mass. Vienna, VA (DC Area) - Now Jacaranda Villas 
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