Aftermarket Heater for tub with jets

Hello all! This forum is excellent - I never knew there was so much to know about bathrooms. We are remodelling our bathroom and have purchased a kohler tub with jets and want to put a heater on the tub (it didn't come with one) to keep the water warm. Has anyone done this and do you have any recommendations for which heaters to try?

Thanks!

You can purchase a Kohler heater for your tub and it would be sure to fit. Jaccuzzi makes an inexpensive one, but I can't tell you if it would need retro-fitted to mount on a Kohler tub.

Do you know if Kohler sells one? I couldn't find one on the internet.