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This manual must only be used by a qualified heating installer/service technician. Converting boiler to propane — ECO 155 . . . . . . . . . . 15. This manual must only be used by a qualified heating installer/service technician. The ECO 155 Series 2 Gas-fired water boilers (continued). ECO Floor Stand Kit Instructions for P/N 383-800-101 This stand is for ECO 70/110/155 boilers only. Follow manual for boiler set up proce-. Manuals and User Guides for Weil-McLain ECO 155. We have 3 Weil-McLain ECO 155 manuals available for free PDF download: Manual, Manual Addendum The Weil-McLain ECO 155 - 143K BTU - 95.1% AFUE - Hot Water Gas Boiler - Direct Vent 383800002 has 383800002 Weil-McLain ECO User Information Manual.Weil-McLain ECO 70 Manual Online: Cleaning Heat Exchanger Flue Side, 155. Cleaning the ECO 155 heat exchanger FLUE SIDE or accessing the burner,