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Drainage decision guide

Built-In Pump vs Gravity Drain for Crawl-Space Dehumidifiers

Drainage configuration is often an installation decision, not a universal product ranking. Use this checklist and verified product data to understand which models match the route available in your crawl space.

Research by Josiah Gavin

Start with the drainage route

Drainage configuration checklist

Neutral guidance

The drainage setup is not fully defined yet. Review whether condensate can drain downhill to a suitable location before excluding pump models.

How to read the output

If condensate can move downhill to a suitable drain, gravity drainage may be compatible. If it must move upward or across a route that will not drain by gravity, a built-in pump may be useful.

DrySpace does not infer pump lift height or installation suitability from fields that are not stored in the verified database.

Pump and gravity models in the verified catalog

ManufacturerModelRated/AHAM PPDMaximum PPDManufacturer max coverageAirflowPumpOperating temperatureResearch
MoiswellAegis HP11053 pints/day120 pints/day4,500 sq ft180 CFMYes41-95 FProduct page
MoiswellDefender M7070 pints/day145 pints/day6,000 sq ft206 CFMNo41-95 FProduct page
MoiswellDefender MP7070 pints/day145 pints/day6,000 sq ft206 CFMYes41-95 FProduct page
MoiswellAegis H15070 pints/day155 pints/day6,500 sq ft253 CFMNo41-95 FProduct page
MoiswellAegis HP15070 pints/day155 pints/day6,500 sq ft253 CFMYes41-95 FProduct page
AlorAirSentinel HD35P35 pints/day70 pints/day1,000 sq ft115 CFMYes33-105 FProduct page
AlorAirSentinel HD55S55 pints/day120 pints/day1,300 sq ft130 CFMNo33.8-104 FProduct page
AlorAirSentinel HD55P55 pints/day120 pints/day1,300 sq ft153 CFMYesNot verifiedProduct page
AlorAirSentinel HD9090 pints/day198 pints/day2,600 sq ft210 CFMNo33.8-104 FProduct page
AlorAirSentinel HDi9090 pints/day198 pints/day2,600 sq ft210 CFMYes33.8-104 FProduct page
AlorAirHelios D3535 pints/day70 pints/day1,000 sq ft97 CFMNo37.4-100.4 FProduct page
AlorAirGalaxy 6060 pints/day145 pints/day1,800 sq ft165 CFMNo37.4-100.4 FProduct page
AlorAirGalaxy 60P60 pints/day145 pints/day1,800 sq ft165 CFMYes37.4-100.4 FProduct page
AlorAirGalaxy 85P85 pints/day180 pints/day2,300 sq ft194 CFMYes37.4-100.4 FProduct page
AlorAirSentinel HDi100100 pints/day220 pints/day2,900 sq ft250 CFMYes33.8-104 FProduct page
AprilAireE05050 pints/dayNot verified1,600 sq ft145 CFMNo50-104 FProduct page
AprilAireE07070 pints/dayNot verified2,200 sq ft200 CFMNo50-104 FProduct page
AprilAireE08080 pints/dayNot verified4,400 sq ft185 CFMNo50-104 FProduct page
AprilAireE100100 pints/dayNot verified5,500 sq ft280 CFMNo50-104 FProduct page
AprilAireE130130 pints/dayNot verified7,200 sq ft310 CFMNo50-104 FProduct page
ArgendonShield 35M35 pints/day70 pints/day1,000 sq ft115 CFMNo33-105 FProduct page
ArgendonShield 35P35 pints/day70 pints/day1,000 sq ft115 CFMYes33-105 FProduct page
ArgendonSandidry 55C55 pints/day120 pints/day1,300 sq ft153 CFMYes33-105 FProduct page
ArgendonShield 6060 pints/day145 pints/day1,800 sq ft185 CFMNo35.6-102.2 FProduct page
ArgendonShield 60P60 pints/day145 pints/day1,800 sq ft165 CFMYes35.6-102.2 FProduct page
ArgendonShield 85P85 pints/day180 pints/day2,300 sq ft194 CFMYes35.6-102.2 FProduct page

Matched pump-versus-gravity comparisons

Moiswell Defender M70 vs Defender MP70Moiswell Aegis H150 vs Aegis HP150AlorAir Sentinel HD55S vs Sentinel HD55PAlorAir Sentinel HD90 vs Sentinel HDi90

These pages compare verified pump and gravity-drain configurations without claiming that one configuration is universally better.

Continue researching

Compare all products

Filter by built-in pump and compare verified specifications.

Use the sizing assistant

Check floor area, drainage, temperature, and moisture context.

AHAM vs maximum PPD

Understand how pint-per-day ratings differ.

Browse research guides

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Browse product research

Open individual product pages with sources and verification dates.