Look at the Ultra brand. I have had one for 5 years plus. No problems.
This tub does NOT circulate water thru the jets, instead, in brings in heated air from the room and sends in thru the many jets. This will circulate the water. The advantage is that you DO NOT HAVE WATER SITING IN THE PIPES AND JETS when you are finished. As a result no mold or nasty water.
Ultra is $$$$, but worth it.