ECO-WORTHY 33-Series 110V Diaphragm Water Pump: features, specs and uses

The ECO-WORTHY 33-Series is a 110V AC diaphragm pump that supplies pressurised fresh water. It's aimed at RVs, campers, boats and similar setups, though the brand also lists irrigation, sprinklers and car washing. Here is what the specs mean and what to confirm about your own water system.

How a diaphragm pump works

A diaphragm pump moves water with a flexible membrane that flexes back and forth, drawing water in through one valve and pushing it out through another. This design is common in RV and marine water systems. It's also typically self-priming, meaning it can pull water up from a tank below it without being filled by hand first.

Flow, pressure and lift

ECO-WORTHY rates the pump at an open flow of 4.0 GPM (gallons per minute) and a rated pressure of 50 PSI. It states that the pump can self-prime up to 9.8 vertical feet and lift water up to 148 feet. Open flow is the figure with nothing restricting the outlet, so flow at a faucet or through a long hose is usually lower. Electrically, the pump runs on 110V AC and draws a maximum of 1.3 amps.

The automatic pressure switch

A built-in pressure switch starts the pump when you open a tap and stops it when you close it, which is how it keeps water on demand. The switch is set at 50 PSI, and the brand says it can be adjusted within a range of 45 to 70 PSI. In general, a higher setting gives stronger flow at the tap but asks more of the pump and plumbing, so check the pressure limits of your fittings first.

Thermal overload protection

ECO-WORTHY says the pump has built-in thermal overload protection. If the temperature goes above 70°C (158°F), the circuit disconnects to protect the motor. The brand also says the pump supports continuous operation for more than an hour. Even so, pumps are normally meant to run only when water is needed, and running one dry is generally harmful, so follow the manual.

Where it fits

The listing mentions RV, marine and boat use, plus irrigation, sprinklers, faucets, long-distance pumping across a courtyard and car washing. Since this is a 110V AC model, you need mains power at the pump, which suits a shore-powered caravan, a workshop or a garden outbuilding. Boats and RVs that run only on 12V batteries would need a different pump.

Size

The pump measures about 12.2 x 5.7 x 5.6 inches (31 x 14.5 x 14.2 cm) and weighs 6.6 lb (about 3 kg). It's compact enough for the cramped spaces found in a camper or boat locker.

What to check before you buy

• Power supply: confirm that you have a 110V AC supply where the pump will go.
• Fittings: check the port size and thread, and what hose or adapters you need.
• Pressure: make sure your pipes, hoses and fixtures can take the 50 to 70 PSI setting.
• Water source: check the vertical distance from the water level to the pump against the 9.8 ft self-prime figure.
• Noise and vibration: diaphragm pumps hum, so consider mounting, and vibration isolation, as the manual describes.
• Water type: the listing describes fresh water use, so don't use it with other liquids.
• Installation: follow the manual and local electrical and plumbing rules, or ask a qualified person.

The short version

• A 110V AC, 33-Series self-priming diaphragm pump with a 4.0 GPM open flow.
• Rated pressure 50 PSI, adjustable from 45 to 70 PSI via an automatic switch.
• Self-primes up to 9.8 ft and lifts up to 148 ft, as rated.
• Thermal overload cut-off at 70°C (158°F); 1.3 A maximum.
• About 12.2 x 5.7 x 5.6 inches and 6.6 lb.

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