AprilAire E100 Dehumidifier review

The AprilAire E100 is a 100-pint-per-day, whole-home dehumidifier for an installation with a planned air path and a continuous lower drain. It has no collection bucket and no built-in lift pump. The unlettered model also has no caster wheels, so it is best understood as equipment for a designed location—not as a self-contained room appliance that you roll around and empty.

I checked AprilAire’s exact E100 U.S. product page, the reused manufacturer-authored E080/E100 installation and owner manual (whose specification table lists E100, E100C and E100H), and the exact EPA ENERGY STAR record. The existing family manual was reused from the site archive; it was not downloaded again for this assessment.

The E100 page links this white rectangular cabinet image with a large round duct opening, control panel and a small drain fitting visible. AprilAire does not state whether the artwork is a photograph or a rendering. It identifies the exact page’s E100 gallery, but the exterior cannot prove internal performance, a drain slope, or room coverage.

Read both capacity numbers with their test conditions

The exact family manual rates the E100 at 100 pints per day at 80°F and 60% relative humidity, at zero external static pressure. Its airflow table also gives 280, 245 and 210 CFM at 0, 0.2 and 0.4 inches water column, then 175 CFM at 0.6. EPA’s current record for model E100 separately lists 85 pints per day under Appendix X1, an integrated energy factor of 2.35 liters per kilowatt-hour, and estimated annual energy use of 821 kWh. These are different rating methods rather than a claim that every home will remove either amount daily. Colder inlet air, duct resistance, moisture entering the building and installation all matter.

AprilAire markets this model for homes up to 5,500 square feet. Treat that as an application headline, not a sizing promise. A contractor still needs to consider the actual house, its layout and air return path, design humidity, building leakage and local conditions. A large area claim does not turn the E100 into a universal answer for an unconnected basement or a wet crawl space.

Plan a permanent air route and service clearance

The manufacturer includes 10-inch inlet and outlet duct collars, an outlet backdraft damper, a washable MERV 8 filter, leveling feet, a barbed drain fitting and an eight-foot power cord. The E100 is listed as 15 inches high, 14 inches wide and 26 inches deep. Those cabinet measurements do not include every service clearance; the manual calls for room to access the filter, electrical panel and drain. It also warns installers to use a condensate pan when the unit is installed in or above a finished space and to keep the appliance indoors and level.

The E100 can be installed as a standalone unit or integrated with ducts, but ducting is not a plug-and-play feature. The family manual describes alternatives such as return-to-return, a dedicated return with discharge to the supply, dedicated inlet and outlet grilles, and return-to-supply. Those layouts have different airflow and pressure conditions; the E100’s maximum allowed external static pressure is 0.6 inches water column. Check the actual duct design with the installer rather than assuming that any two convenient ducts will work.

Gravity is the included water plan

There is no tank to carry upstairs, but that also means there is no bucket backup if the outlet is blocked. The E100’s normal water path is continuous gravity drainage: its outlet and 3/4-inch drain tubing must maintain a downward slope to a suitable floor drain or other allowed discharge. The E100 page says its drain hose is not included; the manual discusses a supplied barbed fitting and compatible tubing. Plan the full route, cleanout access and a way to handle a clog before mounting the unit.

AprilAire documents its Model 4856 condensate pump as a separate accessory capable of lifting water up to 22 feet. That is not a built-in E100 pump, and it should be included and installed as a separate project component if no downhill drain exists. Do not interpret the 22-foot accessory rating as the E100’s own pump limit. The washable MERV 8 filter and drain insert also require periodic inspection and cleaning; the filter is not evidence of a medical air-cleaning benefit.

Current certification is more than a dated badge

AprilAire’s page calls out ENERGY STAR Most Efficient for 2025. EPA’s current dataset has an E100 record dated for U.S. availability and certification, marks it ENERGY STAR certified and shows “Meets Most Efficient Criteria: Yes.” The record’s additional-model field specifically identifies E100C as the caster version. It also says “Connected Capable: No,” so the E100 should not be selected for essential app control. The exact page describes the local built-in digital control, not an app. The manual’s specifications list 115 VAC and 6.7 amps, while a current AprilAire FAQ lists a different E100 current draw; confirm the nameplate and written installation requirements instead of sizing electrical service from one web figure.

Who should consider the E100?

Consider the unlettered E100 when a professional has designed a stationary whole-home or dedicated-space installation, a properly falling drain is available, and you do not need app control or a fitted collection tank. Its meaningful advantages are a documented 100-pint warm rating, duct connections and a bucketless gravity plan. If you want the same general capacity with wheels and drain tubing in the box, compare the distinct E100C. If you want smartphone control, compare the E100W instead. If your only drain is uphill and you do not want a separate pump, this is the wrong water route. AprilAire routes the product through its Healthy Air Professional network; the page does not establish a local quote, current inventory or installed price.