Lol! We were in the same boat when the rains came during the digging process. Now the shell is done.We have a hole! Now comes the rain lol
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Thank you Jim! Always appreciate your expertise!John,
I don't see any major issues with your plumbing.. You don't really need the check valve after the heater and before you SWCG, but it won't hurt anything.
A few extra 90's will not hurt anything as most of the time you will be running at a low rpm anyway.
Thanks,
Jim R.