Enough collector area for domestic HW and hot tub + heat exchanger questions

Thanks everybody for the replys so far...

The hot tub does not have a heat exchanger per say. But then again, it doesn't really have much of anything until UPS delivers all the stuff..

I'm torn between trying to make my own heat exchanger, or buying one, but either way I go, I'll use the hot tubs internal circulation pump to feed one side of the exchanger, and the solar pump would run the other... I'm thinking that if I bury the pipe 12 inches, it should be protected from what we get as a "freeze", the hot tub has a freeze protect mode, which would keep warm water through the heat exchanger....

All the thinking about the amount of valves required is making my head hurt..

Elbie