How Much Water Does a Portable Seawater Desalination Machine Produce Per Day?

A portable seawater desalination machine typically produces 1,000 to 2,000 liters of fresh water per day, depending on the model and membrane configuration. The WTEYA SW-4021 portable unit produces 300 GPD (about 1,200 liters per day, or 50 liters per hour), enough for the drinking and domestic water needs of 5-8 people on a boat, yacht, or coastal home.

Daily Output by Model

SW-4021 (Portable) produces 300 GPD / 1,200 LPD / 50 LPH with one 4021 RO membrane (effective area 3.1 m², recovery rate 10%). The unit runs on 220V or 24V DC power with an installed power of 1.35 kW and weighs only 40 kg.

4040 Systems (Small-Scale) produce 2,000-2,500 GPD (7-9 tons per day) with a single 4040 membrane. Multiple membranes in parallel can reach 10-20 tons per day for small communities and resorts.

Factors That Affect Daily Output

Actual production depends on several factors: water temperature (lower temperature reduces output — this is normal, not membrane fouling), feed water TDS (higher salinity reduces output), membrane condition (fouled membranes need cleaning or replacement), and plunger pump pressure (low pressure triggers a low-voltage alarm).

How to Calculate Your Water Demand

For drinking water only, plan for 3-5 liters per person per day. For drinking plus cooking and washing, plan for 20-50 liters per person per day. A 5-person crew on a fishing boat needs about 100-250 liters per day, well within the SW-4021's 1,200-liter daily capacity.

Contact WTEYA engineers to select the right daily output for your vessel, island, or community based on your specific water demand.

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