Does the HS cir pump, pump water through the plumbing, Chas wrote "The running circ pump keeps the water equal temp all over, including in the plumbing " My Envoy sends cool water from the jets and waterfall when the pumps are started for the first few seconds. Do I have a problem that I need to correct before the tub goes through the 1st winter?? I asked this in another thread but thought I should post it under this subject so all HS experts will see it.