One Response to “Is PEX OK for a Drainback Solar Water Heater?”


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  1. kaywessel

    Dr. Ben, will the same apply if the collector is mounted vertically on the wall and the lattitude is 59, or would it be possible to use PEX-AL-PEX?

    Here copper pipes costs 4 dollars/feet and copper tee’s cost 12 dollars each.

    The PEX-AL-PEX is 24 cents / feet and I am looking at a drainback system without tee’s.

    The material price of these components are more than 20 times more expensive when using copper compared to PEX-AL-PEX.

    The sun is not so strong here and our maximum temperature in the summer is rarely more than 25 degrees Celsius(77 degrees Fahrenheit).

    My idea is to build 3 pcs 150 sqrf collectors and use 3 tanks of 2000 gallons each to store heat.

    In summertime I guess I don’t need so much heat and it is possible to cover the collectors partly.

    Is this design completely crazy or is it okay up here with such cold climate?


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