Propane
Hi PCMC;
I think you will find like I did, that when it comes to tankless, on demand hotwater heaters propane is the better and more efficient way to go.
We had a propane tankless unit installed in our island home and absolutely love it! Propane is very safe when installed correctly so just make sure a qualified plumber who has experience in installing tankless heaters does your work and you should be all set.
No need for antifreeze in the winter as there is a gravity drain in most of the units sold today specifically for winter draining. Very simple to do.
Good Luck!
Dan
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