I had a Laing D5 710 B connected directly to a solar panel to circulate water through a solar water heating system. The pump worked flawlessly for 6 years then failed. I was talked into buying a Topsflo TD5 to replace it. The TD5 is obnoxiously loud, I could barely hear the Laing. I'm going to buy another Laing. I derated on star because I wish it lasted longer.

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