> Those continually burn natural gas Not really - they're very well insulated, so they do a burn/coast/burn cycle where they are off far more than they are on.

> Those continually burn natural gas Not really - they're very well insulated, so they do a burn/coast/burn cycle where they are off far more than they are on. That said - I'm a big fan of tankless, however in a big family with typical loads, the savings in gas alone aren't as much as you'd think.