AprilAire 800 Whole-House Steam Humidifier
- 11.5 gallons per day steam output
- Up to 10,300 sq ft homes
- 3 to 36 grains water hardness range
- 120 volts AC, automatic digital control with sensor
- 5 year manufacturer warranty
Last refreshed Sep 24, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A whole-house steam humidifier that plumbs into the home and runs automatically from a humidity control. It is an installed system, so expect plumbing and a replaceable steam canister.
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ASIN: B0CM85KV9FModel: 800Category: Humidifiers
Overview
AprilAire builds the 800 as an electrode steam humidifier: current passes between submerged electrodes in a canister, and the water resistance heats the water into steam. A hose carries the steam to a dispersion tube in the ductwork.
The reason to look at it is hands-off humidity for a whole home, with a wide water hardness range and no water filtration needed. The limit is that it must be installed into a water line and the canister is replaced each season.
Who it's for
Owners of forced air homes who want automatic control tied to an outdoor temperature sensor will use all of it. A home without plumbing access nearby or without ductwork is better served by portable units.
Pros and cons
- Automatic digital control
- Wide water hardness range
- No water filtration needed
- Hose, tubing and valves included
- Installation into plumbing required
- Canister replaced each season
- Wide installation parts list
- Reverse osmosis water needs special plumbing
Performance notes
Current flows through water between submerged electrodes, and the water's own resistance to that current produces the steam. Impurities in the water carry the current, which is why filtration is not needed. A humidity sensor and outdoor temperature sensor let the control adjust output on its own.
Where it stands among humidifiers
- #6 most-searched brand and model of the 32 humidifiers lines we track (by search demand, not sales).
From the specs of the 46 humidifiers we list; not a test result.
Specifications
| Brand | Aprilaire |
|---|---|
| Model | 800 |
| Dimensions & fit | |
| Item Dimensions D X W X H | 7.13 x 10.13 x 20.88 inches (D x W x H) |
| Item weight | 23 pounds |
| Capacity & performance | |
| Capacity | 11.5 gallons per day |
| Power & efficiency | |
| Voltage | 120 volts AC |
| Included components | |
| Included Components | 6 foot steam hose, 10 foot drain tubing, valves, installation instructions, outdoor temperature sensor, dispersion tube |
| Warranty & support | |
| Warranty Description | 5 year manufacturer |
| Other details | |
| Floor Area | 10300 square feet |
| Operation Mode | Steam, electrode canister |
| Control Type | Model 62 automatic digital control with sensor |
| Water hardness range | 3 to 36 grains |
Closest rivals on specs
Levoit LV600S Smart Warm and Cool Mist Humidifier- Floor Area 10300 vs 753 sq ft (+1268%)
Carepod Cube Plus X50V Stainless Steel Humidifier- Floor Area 10300 vs 700 sq ft (+1371%)
Dreo HM717S Smart Warm and Cool Mist Humidifier 8L- Floor Area 10300 vs 600 sq ft (+1617%)
Frequently asked questions
How do I maintain the AprilAire 800?
At the end of the humidifier season the steam canister, including its electrodes, is replaced. The manufacturer says there is no cleaning or scrubbing, and the Model 80 canister is the part listed.
Does the AprilAire 800 need a water filter?
No. Electrode technology needs impurities in the water to carry current, so water filtration is not required.
What if I have reverse osmosis or deionized water?
Plumb the steam humidifier to a water line before the water flows through the reverse osmosis or deionization equipment.
What comes in the AprilAire 800 box?
Installation instructions, the humidifier, a Model 62 digital control with sensor, an outdoor temperature sensor, a dispersion tube, a 6 foot steam hose, 10 feet of drain tubing, hose clamps, a saddle valve, mounting screws and a Model 80 canister.