considering the powered bath

(Tracking adjusts the kerning between sequential letters.

1.1 is ok)

Kohler experimentation:

My small hot water heater almost supplies enough heat.   I can augment the tub water by turning on a bubbler function, THEN the in-line heater which "keeps the tub water heat at the level sensed" 

Make the tub water as hot as I can initially stand, then when deep enough to cover the first 2 jets on the back, turn the bubbles heat at highest heat level.

Is that working as desired?