Honeywell HE365H8908
Honeywell Power FlowThru Humidifier w/H8908B 18 gpd
**Obsolete** Replaced by HE300A1005

  12 GPD 17 GPD 18 GPD

The Enviracaire Elite HE365H Power Flow-Through Humidifier. The HE365H8908 is a complete system and includes the humidifier, water panel (HC26E1004), self-piercing saddle valve, and the manual humidistat H8908(white).

Check that you have the space, the HE365 overall size is 18h x 15w x 11d". Installation items that are not included are the water line (1/4" copper or plastic tubing), and humidistat wire (2 conductor thermostat wire, 24 gauge).

The HE365H humidifier needs to be wired to only run when the blower and or heat is on. New furnaces provide a 120 vac connection for humidifiers, see the wiring diagram pasted inside the blower compartment. If a 120v humidifier connection is not provided, an optional current sensing relay can be wired in series with the H8908 so to only switch on the HE365H when the blower is running and with a call for humidity.

Honeywell HE365 Location and Dimention

The Honeywell HE365 should be mounted in the warm air flow or if mounted in the return duct, hot water is needed. The air flow should be vertical as the HE365 draws air from the center and returns it out the sides. See Installation Instructions
Honeywell HE365 Humidifier

Skuttle Current Sensing Relay A50

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.

What is Flow-Thru Humidifier?

The term Flow-Thru refers to water trickling through the water panel and out a drain. The advantages of a flow-thru design is reduced maintenance and no standing water. Scale from calcium and lime gets flushed out of the water panel and down the drain. The water panel is an aluminum mesh with a porous coating that inhibits growth of slime and is easy to change (once a year).

The disadvantage of the Flow-Thru is water usage. We are in the northeast where this is not an issue. We get a flat rate water bill unless there is excessive usage then the rate goes up. The Flow-Thru humidifier does not cause excessive usage.

The Flow-Thru is an evaporative humidifier and requires hot air. If not using hot air then hot water should be used. We see little humidity gain if our Flow-Thru humidifier is operating with cold air (and cold water). We run our blower on constant to best utilize our electronic air cleaner, but our humidifier is wired to only operate only when there is hot air and works very well.
Flow-thru Humidifier Type Demostration

By-Pass Versus Power Humidifier

By-pass Humidifier Demostration
Power Humidifier Demostration
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 to the left. 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 HE225 and HE265 are ByPass humidifiers. The HE365 is a fan powered humidifier.

HE265H Versus HE265D

In 2007 Honeywell devised a new naming convention for their humidifiers. The HE265 model number now have the humidistat model for the suffix; H8908 or DG115.

The HE265H8908 includes the H8908 manual humidistat. This humidistat is a wall mounted spst switch. The term manual refers to lowering humidity based on outside temperature. Sacrificing humidity with colder outside temps is necessary to prevent windows dripping with condensation.

The HE265DG115 includes the DG115EZIAQ Digital Automatic Humidistat and outdoor temperature sensor. This humidistat automatically adjusts the humidity based on outside temp. Also displays outside temperature and humidity.

The HE265 models prior to 2008 were the Honeywell HE265A1002 and HE265B1005. The HE265A1002 is identical to the HE265H8908 and came with the manual humidistat H8908B1002. The H265B1005 humidifier came with the automatic humidistat H1008A1008.

Honeywell HE365 Versus HE360

The difference between the Honeywell HE365A1006 and HE360B1009 is the antimicrobial AgION® water panel. The HE360 humidifiers come with the standard water panel HC26A1008. The H365 humidifiers come with the antimicrobial water panel HC26E1004. The HE360 water panel can be replaced with the HE365 antimicrobial and visa versa.

The HE365 series was introduced under the Honeywell Enviracaire Elite brand. This new brand was designed to be more appealing to the residential customer. The Enviracaire Elite brand has a new bold look of blue and white. The HE360 series was under the traditional Tradeline brand with the slate color scheme. With the success of the new look, the tradeline color scheme was phased out. All current production honeywell humidifiers now have the bold blue and white color scheme.

The HE365 models come with a one year warranty the same as the HE360 models. See the HE360 or HE365 Owners manual for complete warranty info (page 8). 

Manual Versus Automatic Humidistat

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.

An automatic humidistat (Aprilaire 60 or Honeywell H6062A) adjusts the humidity by using an outside temperature sensor.

Manual humidistat as used in earlier humidifiers (Model 4655 or H8908b1010) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.

When The Outdoor
Temperature is
This Relative Humidity
Should Be Maintained

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