Reliance 640YBDS 40-Gallon Natural Gas Direct Vent Water Heater

Deliver dependable hot water performance with the Reliance 640YBDS 40-Gallon Natural Gas Direct Vent Water Heater. Designed for residential installations where traditional venting may not be practical, this direct vent model utilizes outside air for combustion while safely venting exhaust gases outdoors. The closed-combustion design helps improve safety and efficiency, making it an excellent choice for homes seeking reliable hot water delivery and long-term durability.

Built around a glass-lined steel tank, the 640YBDS is engineered to resist corrosion and provide years of dependable operation. A self-cleaning dip tube helps minimize sediment buildup inside the tank, supporting efficient performance and extending service life. The electronic gas valve with LED status indication allows for easy monitoring and diagnostics, while the direct vent configuration offers flexible installation options through either a sidewall or roof vent termination.

With a 40-gallon storage capacity and a high-performance natural gas burner, this water heater is well-suited for households that require a consistent supply of hot water for bathing, laundry, dishwashing, and other daily demands. The unit's direct vent system draws combustion air from outside the home, eliminating dependence on indoor air and helping maintain indoor air quality.

Key Features

• 40-gallon residential natural gas water heater
• Direct vent design for safe combustion air intake and exhaust venting
• Can vent through an exterior wall or through the roof
• Closed combustion system draws air from outside the home
• Electronic gas valve with LED status indicator for diagnostics and monitoring
• Glass-lined tank helps resist corrosion and extend tank life
• Durable anode rod provides additional corrosion protection
• Self-cleaning dip tube helps reduce sediment accumulation
• Residential design suitable for indoor installations
• Factory-engineered for dependable hot water performance
• Low-maintenance operation with user-friendly controls
• 6-year limited tank and parts warranty

Product Benefits

Direct Vent Convenience

The direct vent system allows installation in homes where standard atmospheric venting may not be available. By drawing combustion air from outside and venting exhaust gases directly outdoors, the unit operates independently of indoor air supply requirements.

Enhanced Tank Protection

A glass-lined tank combined with an integrated anode rod provides multiple layers of corrosion resistance. This protective design helps extend the life of the tank and maintain long-term reliability.

Reduced Sediment Build-Up

The self-cleaning dip tube creates water movement inside the tank that helps reduce sediment accumulation. This feature contributes to improved efficiency, reduced maintenance needs, and enhanced water heater longevity.

Easy System Monitoring

The electronic gas valve incorporates an LED status indicator that provides operational information and diagnostic assistance, making troubleshooting and maintenance easier.

Reliable Household Performance

The 40-gallon capacity is ideal for many residential applications, providing sufficient hot water for typical daily activities while maintaining efficient operation.

Specifications

Applications

The Reliance 640YBDS is ideal for:

• Single-family homes
• Residential remodeling projects
• Replacement of existing direct vent water heaters
• Homes with limited indoor combustion air availability
• Utility rooms
• Basements
• Mechanical rooms
• Residential new construction
• Installations requiring sidewall venting
• Installations requiring roof venting