I replaced my orginal Gl 30 with the new Guardein Gl30 and it is much better as you can set rhe difference for thr tank to panel which alowes the water to get hotter in the winter monts it has been trouble free sence the day I installed it which takes about 3-5 minites of time Thank you for a great product and in the future I will be buying other solar equipment from you.

Fred E. Gladle

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