The ProMax® XL Circulating Loop Heat Exchanger is designed for installation with ProMax® SL residential gas water heaters to provide domestic hot water plus an isolated source of hot water for radiant floor heating, fan coil heating, hydronic air-handling units and other closed-loop applications. It is offered in 28,000 or 52,000 Btu output models (at 140˚F temperatures) and features a compact, efficient brazed plate heat exchanger.

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