Williams 1403822 Direct Vent Furnace

The Williams 1403822 Direct Vent Furnace is a high-efficiency natural gas wall heater designed for compact residential and commercial heating applications. Delivering 14,000 BTU/hr, this unit is the engineered direct replacement for the 1403612, ensuring seamless HVAC retrofit compatibility with existing venting configurations. Utilizing a sealed combustion system, this direct vent heater draws combustion air from outdoors, making it ideal for bedrooms or tight spaces where oxygen depletion is a concern. The precision-machined stainless steel burner and heavy-gauge heat exchanger provide superior heat transfer while resisting thermal fatigue. This model features a low-profile design and a matchless pilot ignition system for reliable operation during power outages. For professional technicians, the Williams 1403822 offers simplified installation with a standard 9-inch wall thickness venting kit, catering to high-altitude installations where air density impacts combustion stability.

Key Benefits

• Direct Fit Compatibility: Specifically engineered to replace the legacy 1403612 without extensive wall modifications.
• Sealed Combustion Safety: Eliminates indoor air contamination by venting all exhaust gases directly outside.
• No Electricity Required: Operates independently of the power grid, providing a reliable emergency heating source.
• High-Efficiency Heat Exchange: Optimized airflow pattern maximizes BTU output while maintaining cool cabinet surfaces.
• Natural Gas Optimization: Pre-configured for NG combustion with professional-grade gas valves and regulators.

Common Questions

Can the Williams 1403822 be converted to Propane (LP)?
While this model is factory-shipped for Natural Gas, conversion kits are available for LPG applications; however, orifice sizing must be precision-matched to maintain BTU ratings.

What is the maximum wall thickness for the standard vent kit?
The included venting hardware is designed for walls up to 9 inches thick. For deeper wall assemblies, a specialized vent extension kit is required to ensure proper flue gas discharge.

Does this unit require a thermostat for operation?
Yes, it is compatible with standard millivolt thermostats, allowing for precise temperature control without the need for a 24V transformer or external power supply.

This item must ship via truck. Please contact us for freight quote.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.