Heater Model Document Duke FH-11 Operating Instructions Manual ECO FAH1200 Original Operating Instructions ECO FAH1500 Original Operating Instructions ECO FAH600 Original Operating Instructions ECO FAH900 Original Operating Instructions FCV1000 User Manual FCV1500 User Manual FCV2000 User Manual FPH1000 User Manual FPH1500 User Manual FPH2000 User Manual FPH400 User Manual FTOH2500 User Manual FUTIH2000W User Manual