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Hayward Universal H-Series Low NOx H400FD Pool Heater Parts
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Display Board Replacement IDXL2DB1930 for Hayward Heater H400FDN ...
WebFeb 24, 2016 · The Hayward heater uses a two-tube four-pass exchanger instead of a four-tube two-pass exchanger. In my opinion, having only two tubes creates excessive velocity in the copper tubes and results in excessive erosion of the exchanger. I would estimate the water velocity to be above 20 feet per second. WebThe Hayward UHXNEGVT14001 Universal H-Series Heater Indoor Vent Adapter Kit is for Negative Pressure, Vertical Venting for H400FD Heater Indoor Installations. When installing a pool and spa heater indoors, … WebJun 16, 2024 · Hayward H400FDN gas pool heater has been designed with best quality and is well suited to the pool owner with a large pool. It is a low emissions NOx (mono … chirality r and s