Dehumidifier Pump Lift Height: What You Need

What pump lift height means on a listing

The pump lift height on a dehumidifier listing is the vertical distance the built-in condensate pump can push water upward from the unit. Sellers print this figure next to the pump feature, usually in feet, and it answers one question: how far above the unit can the pump move water before it reaches the drain.

The Department of Energy defines a dehumidifier as a self-contained unit with a refrigerated surface that condenses moisture, a refrigerating system, an air-circulating fan, and a means for collecting or disposing of the condensate. The pump is part of that disposal means. A dehumidifier collects water in a bucket or sends it out through a drain hose; with a pump, the water can also move upward, out of a basement or crawl space, to a drain point that sits higher than the unit. Without a pump, water flows by gravity alone, so the drain must be below the unit.

The guide to dehumidifiers with a pump compares listings that state a pump in the title or bullet list. The lift height is one of the stated details to read on each listing.

Why the lift height is a shopping question

The lift height matters when the place you want to send the water is above the dehumidifier. Common situations are a laundry sink at waist height, an above-grade drain opening, and a basement or crawl space where the drain sits higher than the floor the unit would stand on. For those homes, a pump is the part that makes continuous drainage possible.

When the drain point is at or below the unit, a gravity drain hose is enough and a pump is an extra feature. That situation is covered in the gravity drain and pump options article. When the drain is above the unit, the stated lift height has to cover the difference.

Measure the vertical distance from where the dehumidifier would sit to the drain point, then compare it with the stated lift on the listing. If the drain point involves a change to the building's structure or plumbing, ask a qualified contractor; this article covers the shopping terms only.

Reading the listing for the lift figure

A listing may name the pump in the title, in the bullet list, or only on the maker's page. The lift height is usually a separate figure. If the seller does not state it, treat it as an unstated detail and open the maker's page or manual.

Two units can both say pump included while stating different lift heights. Compare the figures on the listings. A unit with a higher stated lift can reach a drain point further above it; a unit with a lower figure may still fit when your drain sits close to the unit's height.

Some maker model names carry the pump word. ALORAIR's listing line includes the Sentinel HDi90 with the words built-in pump in the name, for example. The lift figure itself is still a number printed on the listing or the maker's page.

Ask the maker how the lift figure is stated: vertical height only, or with the hose run included. A longer horizontal hose adds resistance, so the vertical height the pump can move water depends on the hose path. The maker's manual is the place to read this.

Lift height and the rest of your drain setup

The pump is one part of the drainage path. The other parts are the hose, the fittings, and where the hose ends. A listing may include a drain hose with the pump or sell it separately. Read the hose length and connection size on the listing, and see the continuous drain hose setup article for how the hose connects.

ENERGY STAR's buying guidance describes a hose fitted to the bucket that can be directed into a floor drain or sump pump, and notes that whole-home dehumidifiers are usually equipped with only a drain, which should be routed to a floor drain or condensate pump during installation by an HVAC professional. For a portable unit with a pump, the manual describes how to connect the hose and where the pump can send the water.

Keep the hose path as the maker describes it in the manual. If the hose has to travel up and then across, the pump priming article and the maker's manual describe how the pump is prepared before first use.

What this site cannot say about lift height

This site reads listings and compares stated details. It does not measure a pump's performance in a real installation, so the lift figure on a listing cannot be confirmed beyond what the seller prints. The same is true for the pint-per-day, area, and type details: they are the seller's labels.

The main dehumidifier buying guide and the high capacity guide explain how the capacity labels are grouped. The lift height is read the same way: as a stated figure to compare, with confirmation from the maker.

Which guide fits your situation

For a pump pick, start with the dehumidifiers with a pump buying guide, which compares pump listings by stated details. For a basement or crawl space, the crawl space dehumidifier guide and the basement sizing article cover the room side of the question.

The pump benefits article explains the situations where a pump matters, and the basement versus gravity drain article compares the two drain approaches in a basement setting.

What to pick for your situation

Questions

What is pump lift height on a dehumidifier?

It is the vertical distance the built-in condensate pump can push water upward from the unit to a drain point. Read the stated figure on the listing or the maker's page.

How do I measure what my drain needs?

Measure the vertical distance from where the dehumidifier would sit to the drain point, then compare it with the stated lift on the listing. Ask the maker whether the lift figure is vertical height only or includes the hose run.

Is a higher lift figure always a better pick?

No. The lift figure is one stated detail among several. A unit with a lower stated lift can be the right pick when your drain point sits close to the unit's height and the other details suit the room.

Do I still need a floor drain if the unit has a pump?

A pump moves water upward, so a drain point above the unit works, such as a laundry sink. When the drain is below the unit, a gravity drain hose is enough. Read the manual for where the hose can end.

Can a pump send water into a sink drain or plumbing line?

That is a plumbing question. Ask the maker what the manual allows and consult a qualified contractor for any connection into the building's plumbing.