Aprilaire 350 Self-contained Humidifier 12 Gpd

Product Description

The APRILAIRE 350 is a self-contained whole-home humidifier built for residential structures that rely on radiant heat, radiators, or baseboard heating systems where no forced-air ductwork is available. Because it includes an integrated fan, the unit operates independently of a central air handler, making it a practical solution when conventional bypass or powered duct humidifiers are not an option. The 350 delivers up to 12 gallons of moisture per day at an evaporation rate of 0.50 gallons per hour, running on a standard 120-volt circuit at 0.9 amps. Installation is straightforward: the unit hangs directly from basement floor joists, keeping it out of the living space and within reach of a drain and water supply.

The APRILAIRE 350 is designed for residential basements in homes heated exclusively by hydronic systems, including hot-water baseboard and steam radiator setups. It is the correct choice when a forced-air furnace is absent and there is no supply or return plenum available for a duct-mount humidifier. The joist-mount design suits unfinished basement ceilings where access to plumbing lines and electrical outlets is readily available. HVAC technicians and plumbers commonly install this unit together, coordinating the water feed line, drain connection, and electrical circuit in a single service call.

Key Features

• Built-in fan allows independent operation without a forced-air system
• 12 gallons per day output capacity for whole-home humidification
• 0.50 gph evaporation rate with a 6 gph feed rate
• 120-volt, 0.9-amp power draw fits standard residential branch circuits
• Joist-mount design keeps unit off the floor and accessible in unfinished basements
• Fully self-contained cabinet — no duct connections required

Compatibility

Designed as an OEM-style replacement or new-install humidifier for residential homes with radiant, radiator, or baseboard hydronic heating systems where no forced-air ductwork is present.

Installation Notes

Installation is typically performed by a licensed HVAC technician or plumber. Before beginning, shut off the water supply and disconnect power at the branch circuit breaker serving the outlet or dedicated circuit. The unit requires a potable water feed line, a gravity or pumped drain connection, and a properly grounded 120-volt outlet. Follow local plumbing and mechanical codes; in most jurisdictions the electrical connection must comply with NEC requirements for appliance circuits.

Technical Specifications

• Product Type: Humidifier
• Capacity: 12 gallons per day
• Evaporation Rate: 0.50 gallons per hour
• Feed Rate: 6 gallons per hour
• Voltage: 120 volts
• Amperage: 0.9 amps
• Width: 13.75 inches
• Height: 12.75 inches
• Depth: 15 inches

Standard Information

• Brand: APRILAIRE
• Manufacturer Part Number: 350