Troubleshooting Guides Back to Documents All Water Heaters How to eliminate bad odors coming from the water heater Residential Electric Water Heaters Point of Use Standard, Cascade, Super Cascade Residential Gas-Fired Water Heaters Atmospheric Vent Atmospheric Vent with Powered Damper Power Vent Power Vent PV1 Power Vent PV2 Power Direct Vent 2″ Power Direct Vent 3″ FVIR Cleaning Procedure DISCONTINUED MODELS Direct Vent TTX Serie Tankless Water Heaters DISCONTINUED MODELS Comfort Series (UGT) Performance Series (UGTC) Commercial Electric Water Heaters Standard Commercial Gas-Fired Water Heaters Atmospheric Vent (Light Duty) Atmospheric Vent (Heavy Duty) Power Vent (Light Duty)