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HDT2600 ByPass Drum Humidifier
White-Rodgers HDT2600
HDT2600 White-Rodgers Drum Flow-Thru Humidifier
Skuttle 190
Price: $138.00
In Stock
Manufacturer: White-Rodgers
HDT2600 ByPass Drum Humidifier ByPass Flow-Thru Humidifier ByPass Flow-Thru Humidifier
The HDT2600 includes the humidifier assembly, with an evaporator pad, manual humidistat, self-piercing saddle valve, 6" diameter bypass duct, 24 volt transformer, summer shut-off damper, and mounting hardware.

The HDT2600 is reversible and can be set up for a right of left side installation. The humidifier can be assembled with the 6" bypass opening on the right or left side, as well as mounting the float, the overflow drain, and drum motor on the right or left side.

The drum humidifier uses minimal water and electricity. No drain required. Durable thermo-plastic cabinet resists rust, corrosion, and warping. Interior components designed for easy cleaning or replacement. No tools required to replace evatorator pad. A clear window allows a quick easy inspection.

Fan Power Flow-Thru Humidifier
HDT2600 HE120 Skuttle 190 Series Parts
Clean fresh water makes clean fresh air
Replacement Evaporator Pad
Owners and installation manual for HDT2600 (9 pages 388k pdf) White-Rodgers installation instruction for HDT2600  (2 pages 747k pdf)
White-Rodgers humidifier specification (1 page 352k pdf) White-Rodgers Features, specifications, sizing  (2 pages 747k pdf)

The relay is clamped on to the blower wire and has an internal switch that closes when the blower receives current. The blower voltage can be 120v or 240v, only the is amperage important. The internal switch is electronic and can only switch on or off 24 volts, such as any 24 vac humidifier.

Skuttle A50 Current Sensing Relay

The flushing timer drains the humidifier water pan allowing it to refill with fresh clean water. The timer is set to drain the water every 12 hours. Flushing the humidifer keeps the humidifier clean of stagnant water and mineral deposits from accumulating.

Skuttle Automatic Flushing Timer

The White-Rodgers HDT2600 is the same as the Honeywell HE120A. Skuttle manufactures the HDT2600 for White-Rodgers as well as the Honeywell.

All items included with the HE120A are also included with the HDT2600. As well as all internal parts are the same.


The White-Rodgers HDT2600 is the same as the Skuttle 190. Skuttle manufactures the HDT2600 for White-Rodgers and applies their logo.

All items included with the Skuttle 190 are also included with the HDT2600. As well as all internal parts are the same.


The term By-Pass or Power refers to the driving force behind the air flow. The Power humidifier (aka Fan Power) uses a fan to draw the air thru the humidifier. The ByPass humidifier uses a 6" diameter duct that connects the supply to the return duct.

In the ByPass configuration the air leaving the furnace is routed back to the supply. The warm air leaving the furnace takes this short-cut of least resistance and bypasses the long trip down the duct work, in to the house, and back through the return. The ByPass is the 6" round duct work shown below. During the the hot humid A/C season the ByPass duct should be closed with a butterfly valve since the air flow through the humidifier would not be needed.

The Power humidifier uses a fan to draw air in from the duct and through the humidifier and exhausts back out in to the duct. The air is drawn in through duct at the center of the humidifier and back out in to the duct at the sides. The power humidifier should be mounted in vertical warm air flow.

The HDT2600 is a ByPass humidifier. The HFT2700 & HFT2100 are ByPass humidifiers. The HFT2900FP is fan powered.


The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.

A manual humidistat needs to be set back as the season gets colder. An automatic humidistat (such as the Aprilaire 56) adjusts the humidity by using an outside temperature sensor.

The Honeywell automatic humidistat (H1008A) determines the outside temperature based on the furnace duty cycle or with an optional outdoor sensor. Below the Honeywell owners manual discusses this feature they call HumidiCalc.

Aprilaire Humidity Info (270k pdf 4 Pages) H1008 Installation 519k pdf 16 Pages

The White-Rodgers warranty for our new HDT2600 humidifier is one year. Our customers simply ship us the defective part. We inspect and test and confirm defective. We then ship back a brand new part.

The problem with humidifiers is typically due to water quality. Parts will corrode or freeze up with calcium and lime deposits. The mineral deposits from hard water will contain salt that can corrode the motor. Water filtration and treatment is the solution.
White-Rodgers Warranty (1 page 70k pdf) The warranty does not cover problems with corrosion.
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