But, and lets make some assumptions here, if it takes 8 hours for it to cool that 10 degrees from 100 to 90. Theres 8 hours of no heater use. Once 90 is reached you are correct, very minumal difference to maintain 90 or 100. Now lets talk about that reheat time of 2-6 hours. If it is 2 with a 5.5-6 KW heater then how much would the heater run to maintain 100 during those 8 or so hours of cooling, versus no heater use when the temp was allowed to drop to 90?
There's alot going on here and as I said for the few pennys saved either way, if we can afford a spa we deserve to have it ready for use at any time. We work hard enough for a few pennys to not matter. Next time you go out to the bar, have one drink less and your saving more!
That is an affirmative!