3M Filtrete • Abatement Technologies • Amaircare • American Air Filter • Aprilaire • Bryant • Dust Free • Envi • Fantech • Frigidaire • GE • GeneralAire • GlasFloss • Honeywell • Lennox • LG • Maytag • Whirlpool • White Rogers


Skip to Main Content »

Honeywell HM506H8908 TrueSTEAM 6 GPD Humidifier with Manual Humidistat

Honeywell HM506H8908/U TrueSTEAM 6 Gallon Per Day Humidifier with Manual Humidistat

Honeywell HM506H8908 TrueSTEAM 6 GPD Humidifier with Manual Humidistat

Availability: Out of stock

Quick Overview

Honeywell HM506H8908 TrueSTEAM 6 Gallon Per Day Humidifier with H8908 Manual Humidistat.


The Honeywell HM506H8908 TrueSTEAM 6 GPD Humidifier with Manual Humidistat provides the high performance and efficiency of steam humidification with easier maintenance than traditional humidifiers. The patented Condensate Collect Dome and beveled nozzle keep water in the tank, delivering only true steam into your duct’s airflow. The HM506H8908/U TrueSTEAM humidifier provides your home with high-capacity true humidity, while using up to 70% less water than flow-through humidifiers. It automatically fills with water and drains when needed, so you don’t have to remember to do it.

On top of that, the Honeywell HM506H8908 TrueSTEAM humidifier actually controls your homes HVAC equipment for maintaining desirable humidity levels in your home year-round. Wiring to your HVAC equipment allows the HM506H8908/U to supply humidity when you need it by turning on your equipment automatically. The HM506H8908/U has the built-in intelligence to shut down when humidity is not needed for an extended period and after 48 hours of inactivity, it will drain its tank and remain empty until it is needed again. This prevents water from stagnating within the tank. Maintenance is also made simple —just remove the water tank for cleaning. The HM506H8908 TrueSTEAM humidifier’s internal system diagnostics monitor system operation and maintenance schedules as well as system faults. The LED light panel lets you know that the humidifier is operating correctly, when maintenance is needed, and when it is safe to remove the tank for cleaning. The push buttons allow the tank to be drained for cleaning, and quickly return to operation when the tank is reattached to the humidifier.

This unit comes with the manual control, H8908ASPST. This unit can be remote mounted with optional remote mount kit.

Humidifier Features:

  • HM506H8908/U TrueSTEAM humidifier comes with a manual humidistat (Honeywell p/n H8908ASPST) and will support up to 1500 square foot coverage.
  • The TrueSTEAM Humidification System offers the most reliable, efficient levels of moisture because it operates independent of equipment operation, which allows it to deliver a new 1:1 humidification delivery rate.
  • Allows you to maintain the most comfortable humidity levels automatically.
  • The TrueSTEAM humidifier offers a more comfortable living environment at a lower temperature which will allow you to turn down your thermostat for energy savings
  • Provides humidity independent of equipment operation, allowing homeowners to reach their desired humidity set points regardless of air temperature.
  • Can be remotely mounted up to 20 feet from the system (with appropriate kit ).
  • Uses up to 70 percent less water to produce even more moisture than traditional whole-house humidifiers.
  • Requires only a 1-3/4" cut into ductwork and mounts on a separate, lightweight bracket (included) for accurate leveling.
  • Push terminals for easy wiring are routed through an interior harness so no wires are exposed.
  • LED lights indicate when system is running or needs service. Lights also provide feedback to the installer during installation.
  • Multiple sensors sit in a separate compartment to accurately monitor water levels.

Manual Control H8908ASPST Features:

  • Manual control with intuitive comfort settings.
  • Integrated humidity chart for accurate control in changing conditions.

Additional Information

Model NumberHM506H8908/U
Humidifier TypeSteam

Technical Specs

  • Dimensions: 11-1/4”(W) x 19”(H) x 9”(D)
  • Type: Steam Humidifier
  • Capacity (GPD): 6 gallons per day
  • Capacity (LPD): 23 liters per day
  • Mounting: Duct or remote mount (up to 20 feet)
  • Voltage: 120 VAC
  • Temperature Range (F): 34F-104F
  • Temperature Range (C): 1.1C-40C
  • Plenum Opening Size: 1-3/4" diameter
  • Includes: Humidifier, H8908 manual humidity control, duct template, hardware, saddle valve, drain supply water tubing, duct nozzle, mounting bracket, water filter, backflow valve
  • Color: Empire Gray
  • Warranty 5 year warranty