How To Repair Water Leaking Swimming Pool Spa Heater Heat Exchanger Final Round 3 KOThe seller is joenic5 and is located in Staten Island, New York. Hayward H300FD Heat Exchanger with Header and Sensors (used for parts only). Hayward h100id heat exchanger this item is in the category home & garden\yard, garden & outdoor living\pools & spas\pool equipment & parts\pool heaters & solar panels.