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it says simular on all speedfit. the primary gets hotter anyways!!big goose wrote: ↑May 5th, 2019, 8:21 amIn the manufacturing Guide to hep 2/0 . It just says not to be used for secondary hot return. It’s doesn’t explain why . Also I’ve been told by several people your not supposed to . No one has really given me a proper explanation why ? Other than your not supposed to use it constantly without a break as the pipe needs rest time and it would cancel the manufacturing guarantee. Bla bla bla . I don’t think the guaranteed is worth anything anyway.
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