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"30 seconds to wait for hot water" may not sound like much, but when you are on a well, in a record low rainfall area, and you add up the amount of water that you are dumping into a septic system with no benefit, the 'economic savings' becomes secondary. As a simple measure, put a bucket under that '30 sec's of water' to get a feeling for how much it is....and then multiply by the number of times you do that per day and then by 365. I think the volume of wasted water will be staggering!
Record low rainfall area = all of CA in 2013. Running out of fresh water in either NorCal or SoCal may be a pretty big deal....for some.
A recirc pump might make some sense in applications such as these.....as might 'grey water' diversion from the septic tank into the garden area. We are investigating both at this time for the above mentioned reasons. And we've installed Solar Hot Water for the pre-heat on the propane fired hot water heaters, reducing our propane consumption dramatically.
In many areas with abundant water and 'free' natural gas, these sort of measures might not make 'economic' sense, even though it is probably the right thing to do.
I don't think 'recirc' and 'tankless' are ever used effectively together....better to mount the tankless near where the water will be consumed.
two cents worth of my opinions.....YMMV
cheers for the holiday season!!
td
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