Serpentine Drainback System

[@thomastieffenbacherdocsava1549]

Just looking at comments and demonstration. What would be the disadvantage of pex tubing in below zero and 90 degree differences in temperature? If glycol is added?

[@paul6105]

great system. I've been looking for a way to make my system operational in the winter ( cold in Montreal ) and was starting to think that was a lost cause. Would this work if the ply wood was turned the other way ( the copper as well ) ? I would mount mine to the ground and don't want to exceed the height of our fence. thanks Paul.

[@jcanivan]

As long as water can drain you will not have a problem. The serpentine tube must slope downward .

[@jcanivan]

Thank You for that information. My mistake. I guess glycol would only be a problem with evacuated tubes under stagnation

[@diegocastro299]

John Canivan hi jhon i need contact u

[@Jkirk3279]

Uhm... I was astounded that you were pumping from the bottom of the collector to the top. What if you pumped the fluid to the TOP of the loop (past a float valve) and let it go? The pump, when off, allows the fluid to flow backward (unless it's a piston pump?), correct?

[@solarman69]

You cannot effectively control a system that pumps top to bottom.

[@131277stefan]

I'd also suggest the water in the collector flow from top to bottom. But it's common "agreement" to do it the other way. Many years ago I read a book in German that explained about 7 advantages of the "top down flow" in the collector.

[@131277stefan]

@@solarman69 I think you didn't understand his point. You're right with the pump being above the collector doesn't work.

[@spirosdapergolas7592]

Warerrrrrrr=Water?

[@solarman69]

That collector would need to be dead level to avoid freeze damage.