"JustDave" wrote

snip snip

Just an aside ......... I have solar heating. When I want to drain the spa
to put in new water, I pump out into the pool. Then, to fill, I draw water
from the pool, which is about 85 degrees, and not 60 as comes out of the tap
to fill the spa. That converts to five hours less of heating, as my spa
heats at 5 degrees an hour when refilling.

Steve