Series 800 Steam Humidifier

The Aprilaire Model 800 is a whole-house steam humidifier engineered to deliver optimal humidity control in homes up to 6,200 square feet, including installations where traditional evaporative humidifiers fall short. This steam humidifier runs independently of your HVAC system, making it ideal for homes with crawl spaces, attics, non-forced air heating, or milder winter climates. With output capacities ranging from 11.5 to 34.6 gallons per day (depending on electrical configuration), the Model 800 produces pure steam that distributes evenly throughout your ductwork. The system features an automatic digital control for precision humidity management and uses a replaceable canister design for simple, low-maintenance operation.

• Independent Operation: This humidifier operates without relying on your furnace blower, allowing installation in crawl spaces, attics, and homes with non-forced air heating systems. You gain flexible placement options and year-round humidity control regardless of your heating setup.

• High Capacity Coverage: Delivers between 11.5 and 34.6 gallons of moisture per day depending on voltage (120V, 208V, or 240V at 16 amps), covering homes up to 6,200 square feet. This capacity range ensures proper humidity levels even in larger residences.

• Automatic Digital Humidifier Control: Includes precision automatic humidity control that continuously monitors and adjusts output to maintain your target humidity level. This removes guesswork and delivers consistent comfort without manual intervention.

• Replaceable Steam Canister: The user-replaceable canister contains all mineral buildup from water evaporation, eliminating complex cleaning routines. Maintenance consists solely of periodic canister replacement, making upkeep straightforward.

• Multiple Voltage Configurations: Available in 120V, 208V, and 240V configurations at 16 amps, providing installation flexibility to match your home's electrical service. Higher voltage options deliver greater output capacity for larger homes.

• Works with Cold Water: Operates using standard cold water supply (hard, soft, or softened water accepted), requiring no hot water connection. This simplifies installation and reduces plumbing requirements.

• Quiet Steam Generation: Produces steam silently within the canister unit, maintaining a peaceful home environment during operation. Only the water fill and drain valve actuation produce audible sounds.

• Manual Mode Option: Can be installed in manual control mode as an alternative to automatic operation, giving homeowners flexibility based on their preference and system integration needs.

The Aprilaire 800 requires a dedicated electrical circuit at 120V, 208V, or 240V (16 amps) and a cold water supply line with 1/4 inch O.D. connection. The unit includes a 6-foot steam hose for flexible duct connection placement. Installation requires an available drain for the flush/drain cycle and sufficient clearance for the humidifier housing and canister access. The system works with round or rectangular ductwork using the included dispersion tube assembly or optional mounting brackets for specific duct configurations.

Professional installation is recommended due to electrical and plumbing connections required. The humidifier mounts independently near ductwork, with the steam hose directing output into the supply plenum or duct. Maintenance involves periodic replacement of the steam canister (Aprilaire Model 80) as mineral deposits accumulate, with replacement frequency depending on water hardness and usage. The automatic flush cycle after each steam generation period helps extend canister life by removing mineral buildup.

• Aprilaire Model 800 steam humidifier unit
• Automatic digital humidifier control
• 6-foot steam hose with clamps
• Drain hose kit
• Water inlet fill valve with feed tube and clamps
• Steam dispersion tube assembly
• Installation hardware and mounting components

The Aprilaire Model 800 is covered by Aprilaire's limited warranty as detailed in the included warranty documentation. Specific warranty terms, coverage periods, and conditions are outlined in the warranty policy document provided with the unit.

A: The most frequently reported operational issue involves noise from the water fill and drain valves, which can produce audible clicking or banging sounds (water hammer) when solenoids open and close during fill and flush cycles. Some installations may also experience gurgling sounds transmitted through ductwork during the drain cycle. Installing inline water hammer arrestors on the supply line can reduce valve noise in many cases. The replaceable canister design addresses the other common maintenance concern by isolating mineral buildup in a user-serviceable component rather than requiring complex cleaning of internal elements.

A: The primary health benefit is maintaining optimal home humidity levels (typically 35 to 45 percent relative humidity), which has been shown to reduce the incidence of respiratory infections and minimize symptoms related to allergies and asthma by limiting the formation and survival of bacteria and viruses. Additional benefits include protection for wood floors, furniture, and musical instruments from damage caused by dry air, reduced static electricity, and improved overall comfort during heating seasons. The independent operation allows the unit to provide these benefits regardless of whether your heating system is actively running.