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The Honeywell HM512A2000 has been discontinued.
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Honeywell TrueSTEAM direct-injection humidifiers provide 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. TrueSTEAM 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, TrueSTEAM actually controls your homes HVAC equipment for maintaining desirable humidity levels in your home year-round. Wiring to your HVAC equipment allows TrueSTEAM to supply humidity when you need it by turning on your equipment automatically. TrueSTEAM has the built-in intelligence to shut down when humidity is not needed for an extended period. After 48 hours of inactivity, TrueSTEAM 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 with the TrueSTEAM—just remove the water tank for cleaning. TrueSTEAM's internal system diagnostics monitor system operation and maintenance schedules as well as system faults. The LED light panel on the TrueSTEAM 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.


Standard Features

  • Provides humidity independent of equipment operation, allowing homeowners to reach their desired humidity setpoints regardless of air temperature.
  • Can be remotely mounted up to 10 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.
  • H8908 Manual Control.
  • 5-Year Limited Warranty

Maximum Coverage Area

Maximum coverage area means this humidifier will perform well for home sizes up to the square footage indicated, provided that the home is “tight." A "tight" home is typically one that is sealed well around windows and doors and does not leak air to/from the outdoors.

Maximum Coverage Area
3000 Square Feet
Gallons per Day
12 gallons
Electrical Requirements

Power-Fan Humidifiers require 110 AC plug-in power to run the fan, as well as a 24v switch from the furnace board. Bypass Humidifiers only require the 24v switch from the furnace.

Electrical Requirements
120 Volts
Required Minimum Circuit Capacity
12 amps
Weight (Empty)
9 lbs
Weight (Filled with Water)
15 lbs
11 1/4 Inches
9 Inches
19 Inches
Limited Warranty
5 Years
These accessories ship free with freight item in cart.
Honeywell 50024917-001

10' Remote Mount Kit for TrueSTEAM Humidifiers

$100.99 Qty:
Honeywell 50024917-002

20' Remote Mount kit for TrueSTEAM Humidifiers

$133.99 Qty:
Honeywell 50028044-001_2
Honeywell 50028044-001

Inline Water Filter for Honeywell TrueSTEAM Humidifiers

$37.99 Qty:
Honeywell RO System w/ Tank & Pump
Honeywell 50045947-002

Reverse Osmosis Filtration System with Storage Tank and Pump - for Homes with Less Than 45 psi Water Pressure

$259.99 Qty:
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