Eufy S1 Pro vs E20 Breast Pump

If you’re trying to decide between the Eufy S1 Pro and the more budget friendly Eufy E20, you’re comparing two wearable pumps that share a similar design but are built for very different routines. Both models offer hospital grade suction, smart app control through the Eufy Baby App, gentle HeatFlow warming, and the same comfortable in bra design, but the S1 Pro includes several premium features that matter if you pump multiple times a day or rely on portable power.

The E20, on the other hand, delivers impressive performance at its price point. You still get the same 300 mmHg suction strength and access to Eufy’s smart pumping modes, along with three levels of HeatFlow warming, which makes it one of the best value options in the Eufy lineup for daily pumping.

In this Eufy S1 Pro vs E20 comparison, I’ll walk you through the differences I found while reviewing both pumps for Pumping Milk. I’ve tested every model in the Eufy lineup and covered them in my full guide to Eufy wearable breast pumps, and this comparison will help you understand how these two pumps stack up in comfort, heating, portability, and everyday usability so you can choose the option that best fits your routine.

Prefer to watch? Start with the video Eufy S1 pro vs E20 review below where I compare both Eufy pumps side by side.
Prefer to read? Just scroll down for the full breakdown.

Editor’s note: Pumping Milk is reader-supported, meaning, at no cost to you, I may earn a commission if you buy after clicking an affiliate link. Learn More.

Similarities and Differences

When comparing the similarities between the Eufy S1 Pro vs E20 wearable pumps, you’ll notice they share the same core foundation, including the 300 mmHg suction strength, the compact in bra design, and access to the Eufy Baby App for smart control. On the surface, they look like they should perform almost the same, and in many ways they do.

But the experience of using each pump can feel quite different once you factor in heating flexibility, portability, battery support, and how each setup fits into a daily routine. These differences matter more depending on whether you pump occasionally, pump multiple times a day, or need something reliable for long stretches away from a power outlet.

So while the pumping power is very similar, the way each pump fits into real day to day use sets them apart in noticeable ways.

In the sections below, I’ll break down how the S1 Pro and E20 compare in design, comfort, heating, battery life, and overall value so you can see which one lines up best with your needs. But, if you’d like a closer look at how each pump performs individually, you can read my Eufy S1 Pro breast pump review or my Eufy E20 breast pump review.

* Excludes new releases

Pump Design

When it comes to physical design, the Eufy E20 and the Eufy S1 Pro are virtually identical. Both pumps share the same rounded wearable shape, the same five piece construction, and the same 5 oz collection cup that sits low in the bra for a discreet, comfortable fit. The cup curve, tunnel depth, and overall in bra footprint are identical across both models.

The only visual difference is a slight change in the outer shell colour.
Beyond that, the frame, weight, and feel of the two pumps are the same.

Because the S1 Pro and E20 match so closely in design, both wearable pumps offer the same level of comfort during daily use. Any differences between these two models come from features and performance rather than the physical design itself.

Pumping Modes and Suction Levels

Both the S1 Pro and the E20 use the same internal motor, reaching up to 300 mmHg, so neither pump has an advantage in suction strength. Each model offers a stimulation mode and an expression mode on the pump itself, along with seven suction levels you can adjust throughout your session.

Once connected to the Eufy Baby App, the two pumps unlock the same preset rhythms, custom cycle controls, and session tracking tools. The app behaves the same way for both the Eufy E20 and the S1 Pro, giving you identical control over speed, rhythm, and timing.

Since the motor performance and smart controls match, the pumping feel is very similar between these two wearable pumps. The biggest differences between these two models show up in their heating options and battery support, not in suction strength or the way the pumping modes work.

Comfort

Both the Eufy S1 Pro and Eufy E20 offer a very similar comfort experience. They share the same 105-degree angled flange and soft silicone inserts that sit comfortably in the bra, following the natural breast shape to reduce pinching and help maintain a steady seal during each session.

Both models also include HeatFlow™ warming, which adds gentle warmth behind the flange to support letdown and make pumping feel more natural. The difference lies in the number of heat settings:

• S1 Pro – seven levels of warmth for finer control.
• E20 – three levels that still provide noticeable comfort and ease.

You can also control the heat settings directly from the Eufy Baby App, where you can adjust temperature and even set a timer for the warming function to turn off automatically during your session — a nice touch for comfort and safety.

Each pump comes with 17 mm, 19 mm, 21 mm, and 24 mm flange sizes, so it’s easy to find a comfortable fit. The short tunnel design may not feel comfortable if you have elastic nipples, but the overall fit and feel are the same between the two Eufy pumps.

For most moms, comfort is nearly identical across both pumps—the S1 Pro’s expanded heat range simply gives you a little more flexibility if you depend on warmth to encourage flow.

Noise Levels

Both operate at just 46 dB. This is considered whisper quiet for a wearable pump and works well for discreet pumping at work or during overnight sessions.

There’s no noticeable difference between the models in terms of noise.

Battery Life and Charging

Similar to the Eufy S1 Pro vs S1 breast pump, battery life is one of the biggest differences between the Eufy S1 Pro and the Eufy E20, and it can really affect your daily routine.

Eufy S1 Pro

• Up to five days of portable power with the rechargeable charging case
• Magnetic charging base for quick, secure recharging
• Ideal for working moms, travel, or days when you’re away from outlets

Eufy E20

• Around 2.5 hours of runtime per charge
• USB-C charging for simple, universal compatibility
• No charging case — you’ll need to recharge more often between sessions

Both models charge quickly, but the S1 Pro clearly offers more convenience for frequent or all-day pumping. Its rechargeable carry case automatically tops up the pumps between sessions, removing the need to track battery levels.

Some moms actually prefer the USB-C setup on the E20, since it uses a standard cable that’s easy to replace or charge anywhere, while others find the magnetic charger on the S1 Pro neater and faster for daily use.

If you usually pump at home or only need a few sessions per day, then I think the Eufy E20 performs well for its price. But if you’re pumping multiple times on the go or prefer not to think about charging, I believe the S1 Pro’s extended battery setup is worth the upgrade.

Accessories

When it comes to accessories, both the Eufy S1 Pro and Eufy E20 come with three flange inserts (17 mm, 19 mm, 21 mm), spare valves, and charging cables. Everything you need to start pumping is included with both models.

However there are a few difference with what is included with your pump.

The Eufy S1 Pro includes a hard shell, rechargeable carry case, which protects the pumps and keeps them neatly stored between sessions. It also comes with an additional spare set of duckbill values, a small cleaning brush, and dust covers.

The E20 doesn’t come with a carry case or carry bag, so you’ll need to store the pumps separately or use your own pouch.

With the exception of the rechargeable carry case, the additional accessories that the S1 Pro comes with will not have a big day to day impact on your pumping, but they can add a touch of added convenience.

Price and Value

The decision between breast pumps often comes down to price — and what you’re getting for that difference. And I think the E20 and S1 Pro price can be a big deciding factor. Typically, the S1 Pro costs around $150 more than the E20 which is a big difference.

For many moms, that extra cost is only worth it if you need premium features like the rechargeable carry case, magnetic charging base, and additional warming levels. If you pump mostly at home, only pump a few times a day, or prefer a simpler setup, the Eufy E20 delivers excellent performance for its lower price. It offers the same suction strength, app control, and core pumping comfort for far less money.

On the other hand, if you pump several times a day — especially away from outlets — or you value the convenience of longer battery life and easier recharging, the Eufy S1 Pro becomes worthwhile. The extra warmth settings, charging case, and quick magnetic recharging make daily pumping smoother and more flexible, and for many moms, that convenience justifies the higher cost.

In short:

• Choose the Eufy E20 if you want a reliable, budget-friendly wearable pump that covers all the essentials.
• Choose the Eufy S1 Pro if you pump frequently or on the go — the added comfort and convenience make it worth the roughly $150 upgrade.

Final Verdict

If you’re wondering whether you should buy the Eufy S1 Pro or E20, for me the decision really comes down to how you plan to use your pump and how much convenience you value day to day.

If you pump multiple times a day, move between home and work, or want a setup that’s always charged and ready to go, I’d recommend the Eufy S1 Pro. Its seven HeatFlow™ warming levels, rechargeable carry case, and magnetic charging base make it the most convenient choice for regular or exclusive pumpers who rely on consistent performance.

If you’re looking for a more budget-friendly option that still offers excellent suction, quiet operation, and gentle warming, the Eufy E20 is a fantastic pick. It delivers much of the same pumping comfort and app control for a significantly lower price, making it ideal if you mainly pump at home or only need a few sessions per day.

Both are well-designed wearable pumps, but the right one depends on your lifestyle. Think about how often you pump, whether you’ll need portable power, and how much you value extra warmth and convenience — that’s what will guide your decision.

If you think the Eufy S1 Pro or Eufy E20 could be the right fit for your pumping routine, you can use my exclusive discount code below to save on your purchase.

Eufy website

• Shop Eufy Breast Pumps and use code PMilkeufy at checkout for 16% off sitewide.

Related Posts You’ll Find Helpful

If you’re still deciding which Eufy wearable breast pump best fits your lifestyle, these in-depth guides will help you compare comfort, portability, and real-world performance:

• Top wearable breast pumps for moms – A full roundup of this year’s best hands-free pumps, including Eufy, Momcozy, and Willow, all tested for comfort and convenience.
• Momcozy M6 vs Eufy S1 Pro – Compare how Eufy’s premium model stacks up against Momcozy’s lightweight, budget-friendly M6.
• Eufy vs Willow Go breast pump comparison – A detailed look at suction strength, comfort, and design for moms who need a quiet pump for work or travel.
• Eufy vs Momcozy M9 comparison guide – Discover which pump offers better control, app features, and heating support for all-day pumping.
• Top travel-friendly breast pumps – Explore the best portable pumps for commuting, work, and life on the go — featuring the Eufy S1 Pro and E20.