Whole-House Steam Humidifier, Automatic Steam Humidifier

Aprilaire Model 800 – Whole-House Steam Humidifier for High-Capacity Applications

The Aprilaire Model 800 is a residential-grade steam humidifier engineered for whole-house applications where traditional bypass or fan-powered units are not suitable. This self-contained system generates steam independently of the HVAC system and is ideal for use in homes with hydronic heat, radiant heat, or other non-forced-air systems.

Operating on a demand-controlled basis, the Model 800 introduces steam into the air stream via a dedicated dispersion tube and maintains precise humidity levels with its included digital humidistat. Designed for durability and high output, it is well-suited for installations requiring consistent moisture levels in challenging climate conditions or large residential spaces.

Key Features

• Steam Capacity: Capable of delivering between 11.5 to 34.6 gallons per day, depending on voltage and water conductivity
• Automatic Control: Digital humidistat monitors indoor conditions and adjusts operation to maintain target relative humidity
• Self-Generating Steam: Does not rely on furnace heat; ideal for homes without ducted heating systems
• Electrode Technology: Uses replaceable canisters with electrodes for consistent steam output and simplified maintenance
• Versatile Installation: Supports applications in homes up to 6,200 sq. ft. with proper insulation and tight construction

Technical Specifications

• Model: Aprilaire 800
• Electrical: 11.5 A @ 120 VAC or 6.0 A @ 240 VAC, 60 Hz
• Dimensions: 20-7/8" H x 10-1/8" W x 7-1/8" D
• Output Range: 11.5–34.6 gallons per day
• Control: Included automatic digital humidistat with outdoor temperature sensor

Installation Requirements

The Aprilaire Model 800 requires a dedicated electrical connection and plumbing access for cold water supply. Steam dispersion into ductwork or an independent room steam distribution kit must be installed according to manufacturer guidelines. Due to the nature of steam generation, professional installation is recommended to ensure electrical safety, condensate drainage, and code compliance.

Professional Use Considerations

This unit is suitable for use in larger residential or light commercial applications where consistent humidity is required across multiple zones. It is particularly effective in buildings with hydronic or radiant heat systems. Aprilaire’s electrode canister system simplifies servicing and offers predictable maintenance intervals.