On demand hot water for whirlpool tub?
I have a high efficiency Polaris 50 gal water heater in my basement. Does very nicely for entire house, even with a lot of showers going. But, when I want to fill our over sized soaking whirlpool tub on the second floor it does not even fill to the jets before the hot water is out.
I am looking for a tankless, electric, on-demand hot water heater that is small enough for me to mount under the whirlpool tub deck and put in line with the hot water to help give it a boost so the tub can be filled and hot.
Are there any that are meant for a single use tub boost like this? If is, what is the best one out that that will mount under a tub deck in limited vertical space?
Thanks for your help.