Gas Tankless Models Service Bulletins
GWHC800ES / GWHC920ES / GWHC920ESC / Integra 500
2400ES / 2700ES / 715ES / C800ES / C920ES / C920ESC / Integra 500 & Evolution 500
715ES / C800ES / 2400ES / 2700ES / Evolution 500 & Integra 500
715ES / C800ES / C920ESC / 2400ES / 2700ES / Evolution & Integra 500
2400ES / 2700ES / 715ES / Evolution 500
GWH715ES / GWH2400ES / GWH2700ES / Evolution 500
250SX / 250SXO / 2400E / 2400EO / GWH-635-ES / GWH-635-ESO
Manual Supplement - Twin Pipe Requirements for Freezing Climates