Check Gas Pipe Size First BEFORE Installing Water Heater! (see details in manual)
Indoor Flue Pipe Options:


Figure1: End Cap

Figure2: Flue Pipe

Figure3: Elbow

Figure4: Flange
Download an ECOHOT Flue Pipe Parts List [HERE]
  WH-321063 Series Install Manual WH-321063 Series Install Manual

9 Gallons per Minute (Indoor)
  • Max: 218,000 btu/h
  • Min: 18,000 btu/h
  • Indoor
  • For Nature Gas: WH-321063-NG
  • For LPG: WH-321063-LP
  WHO-321064 Series Install Manual


  • Max: 218,000 btu/h
  • Min: 18,000 btu/h
  • Outdoor
  • For Nature Gas: WH-321064-NG
  • For LPG: WH-321064-LP
WH-321063-L Series Install Manual
7.7 Gal/Minute Tank-less Water Heater
  • Max: 185,000 btu/h
  • Min: 18,000 btu/h
  • Indoor
  • For Nature Gas: WH-321063-L-NG
  • For LPG: WH-321063-L-LP
WH-321063-L Series Install Manual

 7.7 Gal/Minute Indoor Tank-less Water Heater
  • Max: 185,000 btu/h
  • Min: 18,000 btu/h
  • Outdoor
  • For Nature Gas: WH-321064-L-NG
  • For LPG: WH-321064-L-LP
WH-201061 Series Install Manual

9 Gal/Minute Outdoor Tank-less Water Heater
  • Max: 135,000 btu/h
  • Min: 19,000 btu/h
  • Indoor
  • For Nature Gas: WH-201061-NG
  • For LPG: WH-201061-LP
WH-201059 Series Install Manual

9 Gal/Minute Indoor Tank-less Water Heater
  • Max: 135,000 btu/h
  • Min: 19,000 btu/h
  • Outdoor
  • For Nature Gas: WH-201059-NG
  • For LPG: WH-201059-LP