<https://www.chapala.com/webboard/index.php?/topic/85057-hot-water-heater-help/#comment-631528>
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"Those double gas heaters do use a lot of gas and have way more capacity than most need (or want to pay for.....)\n \n\n\n\tSize-wise, a solar water heater of average size can go in a space of about 2 x 2 meters, or less, including room around it for access.    Average payback @ lakeside is about 2 years, some more, some less, of course.\n \n\n\n\tAnd no larger gas line is needed for an on-demand gas unit.    The electric ones do draw quite a bit, typically more than many older homes are set up for, though a new line could be run in from the CFE meter; &gt;&gt;&gt;  most do not wish to get into that, just putting it here for the info / perspective.\n \n"
<https://www.chapala.com/webboard/index.php?/topic/85057-hot-water-heater-help/&tab=comments#comment-631504>