Santa Fe UltraMD33 In-Wall Dehumidifier review

The Santa Fe UltraMD33, current part 4044610, is an in-wall dehumidifier for a dedicated room or apartment—not a portable unit and not a central ducted model. It is most compelling when a slim, finished-wall installation and a nearby gravity drain solve a specific space’s moisture problem. Before choosing it, plan the framing, drain, electrical access and front-cover clearance; the installation work is a larger decision than its compact-looking face suggests.

This assessment uses Santa Fe’s current U.S. UltraMD33 page, the 4044610 A2L data sheet and the 4044610 installation manual. The discontinued Ultra Aire MD33, part 4035900, used R134A and has different ratings; do not substitute its specifications for this current R454B configuration.

Read the capacity beside its test condition

Santa Fe rates part 4044610 at 37 pints per day at 80°F and 60% relative humidity. Its exact data sheet and manual list a separate 22-pint/day point at 65°F and 60% RH, with a 1.64 L/kWh integrated energy factor in the manual’s registration table. Those are different controlled conditions, not a promise of what a particular apartment or basement will collect. There is also a manufacturer-page labeling mismatch: the page’s secondary performance text associates the 22-pint figure with 73°F/60% RH, whereas the exact sheet and manual use 65°F/60% RH. Keep the tested condition attached to the number rather than treating the page’s two labels as interchangeable.

The page says the model is ENERGY STAR rated, but an exact EPA model-number lookup for 4044610 returned no row. That does not prove the product is ineligible; it means current program status is unconfirmed from the checked record. If a verified current certification is essential, check the current registry or the exact unit’s label before deciding. Do not treat the 1.64 IEF as a certification or a prediction of a monthly power bill.

A wall appliance, with framing and finish work

The body is listed at about 14.19 inches wide, 30 inches high and 5.75 inches deep, but the data-sheet drawing shows a roughly 17.25-by-33.56-inch front plate. Allow for the visible diffuser, framing, electrical routing, drain hose and removal of the front cover—not only the cabinet depth. Santa Fe describes fitting the unit within 16-inch-on-center stud walls and gives separate plans for 2×6 wall cavities and through-wall 2×4 installations. A finished room on the other side of a 2×4 wall can require the separate bezel kit; a wall exposed to an unconditioned area may need the rear-panel accessory. A surface-mounted installation requires its own kit.

This model recirculates room air through the wall diffuser and does not use HVAC return or supply ducts. Its lower grille draws air in and the upper section sends dried air back into the space. Keep furniture and other obstructions at least six inches from that face. The manual warns against placing the cabinet directly against framing because vibration can travel into the structure; a qualified installer should check the wall, opening, concealed wiring and plumbing before cutting. The listed 1,200-square-foot coverage is manufacturer sizing guidance based on a ten-foot ceiling, not a room-by-room moisture-load guarantee.

Gravity drainage is the base operating plan

There is no bucket and no built-in pump. The manual includes a ten-foot condensate hose and directs it down the wall cavity to an acceptable drain; for gravity operation, the unit’s bottom must be at or above the receiving drain and the hose needs a continuous fall. Santa Fe suggests roughly a quarter-inch drop per foot and says local code may require a trap. A separate pump may be considered if gravity will not work; the product page links a pump kit, but it is not part of the base configuration. A pump accessory does not turn this wall model into a self-contained portable unit. The page and sheet also describe the hose fitting in different ways, so check the connection and included hose before rough-in.

Controls are hidden; upkeep is not

The digital humidity control sits behind the diffuser, which can be secured with tamper-resistant fasteners. The manual lists a 55% factory setting and allows a 35–99% set point in one-point steps; it retains the prior setting after a power interruption. No app or Wi-Fi control is documented. The included washable filter should be checked every two months and cleaned or replaced as needed. Removing the cover for service requires de-energizing the unit. It is a modest recurring task, but the concealed location means filter access and safe front-cover removal should be considered during layout.

The page lists 45 dBA, while the exact data sheet says 46 dBA; neither value is an independently measured room result. The page also reports 155 CFM, compared with 150 CFM on the exact sheet. The manufacturer’s 120-volt, 15-amp circuit requirement, 10-foot cord and R454B refrigerant make this a code-sensitive fixed installation, not a plug-in appliance to mount casually. A grounded connection is described, but local electrical rules and the instructions for the purchased part govern.

Who should compare it with the Ultra70?

The UltraMD33 suits a space that can accept an in-wall diffuser, has a lower gravity-drain route and does not need the central HVAC ducting or optional outside-air ventilation of a whole-home system. The Santa Fe Ultra70 is a different installation: a compact ducted appliance rated at 70 pints/day at 80°F/60% RH, with 8-inch return and supply collars, a MERV-13 filter and optional ventilation. If you already have a compatible duct layout and want house-wide distribution, compare that route instead. If you only need a portable room appliance with casters, bucket collection or an integral pump, neither fixed-install choice is a direct substitute.

The page advertises a six-year warranty, while TS-2091 states five years for the product and six for components; read the certificate for exact coverage and labor terms. Choose the MD33 when wall position, opening, controls and gravity drain all work together. Confirm part 4044610, finish accessories, electrical approach and drain fitting before installation.