Eufy S1

With insurance, the Eufy S1 costs $0 to $145, depending on your plan. Many plans cover it in full; others add an upgrade fee. Check your coverage and we’ll tell you your exact cost before you order.

Up to 300 mmHg across 7 suction levels and 3 speeds, eufy says. That is a higher maximum than the Spectra S1 and S2, which list 270 mmHg. Compare maximums only; a higher number does not mean a pump empties better.

Assembly takes four steps, from eufy’s user guide. 1. Press the duckbill valve into the small hole inside the container and flick it to check it holds. 2. Push the flange tunnel onto the container with the heating pins in the oval notch, then wrap the outer ring. 3. Set the diaphragm in the groove, concave side toward the flange. 4. Press the pump hub onto the top of the container to seal the gap with the diaphragm.

Wash by hand: eufy’s guide says not to use a dishwasher or a microwave. Rinse every part except the pump hub in warm, soapy water with the supplied brush and air dry them, and wipe the hub with a damp cloth. Before first use, boil the parts for up to 5 minutes, stirring constantly, or steam them for up to 5 minutes.

eufy counts 4 washable parts: the flange, duckbill valve, diaphragm and milk container. The pump hub is not washable. eufy rates the washable parts at 1 to 3 months, extra duckbill valves come in the box, and other replacements are sold at eufy.com.

A 24 mm flange with 17, 19 and 21 mm sizing inserts in the box, and eufy sells 27 mm flanges separately. eufy’s chart by nipple diameter: 13 to 15 mm is a 17 mm insert, 15 to 17 mm a 19 mm insert, 17 to 20 mm a 21 mm insert, 20 to 23 mm the 24 mm flange and 23 to 26 mm the 27 mm flange. For 11 to 13 mm the chart calls for a 15 mm insert, which is not in this box.

eufy’s site rates a charge at 4 to 6 pumping sessions, and its comparison table lists 5.5 hours for the S1 Pro, which has the same pump. The user guide’s spec sheet lists 2 hours of use, 1.5 hours to charge and a 1400 mAh battery, so eufy’s own figures differ. The magnetic cable charges both cups at once.

The pump is the same: same warmth, suction, app and 5 oz cups. The eufy S1 Pro adds a charging case that eufy rates at up to 5 days of power. The S1 charges on a magnetic cable and comes with a soft storage bag.

No. The S1 warms and pumps. For VibraPump™ massage, a nipple light and full-cup alerts, see the eufy S2.

eufy lists the S1 at up to 300 mmHg, and its FAQ calls the S1 Pro’s same figure “hospital grade suction”. Its blog says that describes a suction level, not a promise of rental-unit performance. We do not call it hospital grade.

Under 46 dB, eufy says, the same rating it gives the S2 and S2 Pro.

eufy’s guide does not address reclining. It says to lean slightly forward so your nipple is centered in the flange tunnel, never to use the pump while sleeping or drowsy, and not to wear it for more than 35 minutes unless your provider says otherwise.

Most health plans must cover a breast pump under federal rules, and we check whether yours covers the eufy S1. Start your order through insurance, and we will tell you before anything ships if your plan covers a different pump.