Eufy S1 Pro vs S2 Pro vs E20: What’s the Difference & Which Breast Pum

So you’ve decided you want a wearable breast pump, you’ve come across the eufy range, and you’re thinking: these all look amazing… but how do I actually choose between them?!

The E20, S1 Pro and S2 Pro all offer hands-free pumping, but each one brings something slightly different to the table. Some of those differences may not matter much to you, while others could be genuinely game-changing for your breastfeeding journey — and worth spending a little more on.

So, which features actually matter? What are the real differences between the three pumps? And which one is going to work best for you, your pumping routine and your needs? We’ve taken a deep dive into the eufy range to break down the features, the differences and the things we think are actually worth paying attention to, so you can choose the pump that makes the most sense for you — rather than simply going for the newest or most expensive option.

Your Options at a Glance

	eufy Wearable Breast Pump E20	eufy Wearable Breast Pump S1 Pro	eufy Wearable Breast Pump S2 Pro
Price	R3,990	R5,990	R7,990Sold out
Best for	Occasional to regular pumping, at the best value	Frequent pumping: the middle ground	Exclusive pumping and maximum control
Suction levels	7 levels	7 levels	10 levels (finer steps, not stronger)
Max suction	300 mmHg	300 mmHg	300 mmHg
Cycle speeds	3 (in the app)	3 (in the app)	3 (in the app)
Pumping modes	Stimulation and Expression	Stimulation and Expression	Stimulation and Expression
Pumping rhythms	OptiRhythm™: Max, Natural, Standard and Gentle Custom rhythm in the app	OptiRhythm™: Max, Natural, Standard and Gentle DIY Rhythm 1.0	OptiRhythm™ 2.0 Flow Curves: Max, Natural, Standard and Gentle DIY 2.0
DIY customisation	Adjust the suction pattern and how long each setting runs; save up to 5 rhythms	Customise suction settings and their duration; save up to 5 rhythms	Build a sequence of Stimulation, Expression and Rest phases, setting the level and length of each
Heating	3 settings: 35°C, 38°C and 42°C	HeatFlow™: 7 levels 35–41°C	HeatFlow™ 2.0: 7 levels 35–41°C 360° wrap-around warmth Heats up in about 15 seconds
Pump battery life	About 2.5 hours (4–6 sessions)	About 3 hours	About 6.5 hours
Charging	USB-C cable; no charging case	Wireless Charging Case 1.0: up to 5 days of pumping*	Wireless Charging Case 2.0: up to 6 days of pumping*; recharges both pumps about 1.5 times
Collection cup	150 ml	150 ml	360° transparent cup, for easier alignment and seeing milk levels
Nipple light	No	No	Yes
Smart milk alerts	No	No	Yes: stops automatically when full, plus overflow alerts
Massage	No	No	VibraPump™ 12 mm massage head 4 modes: Boost, Relieve, Soothe and Fusion 3 intensities
Flange sizes in the box	24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)	24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)	24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)
Spare parts	Established parts, easy to find	Established parts, easy to find	Newer design; ask us about spares stock

eufy Wearable Breast Pump E20

R3,990

Best for: Occasional to regular pumping, at the best value
Suction levels: 7 levels
Pump battery life: About 2.5 hours (4–6 sessions)

See full specs

Max suction

300 mmHg

Cycle speeds

3 (in the app)

Pumping modes

Stimulation and Expression

Pumping rhythms

OptiRhythm™: Max, Natural, Standard and Gentle
Custom rhythm in the app

DIY customisation

Adjust the suction pattern and how long each setting runs; save up to 5 rhythms

Heating

3 settings: 35°C, 38°C and 42°C

Charging

USB-C cable; no charging case

Collection cup

150 ml

Nipple light

No

Smart milk alerts

No

Massage

No

Flange sizes in the box

24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)

Spare parts

Established parts, easy to find

eufy Wearable Breast Pump S1 Pro

R5,990

Best for: Frequent pumping: the middle ground
Suction levels: 7 levels
Pump battery life: About 3 hours

See full specs

Max suction

300 mmHg

Cycle speeds

3 (in the app)

Pumping modes

Stimulation and Expression

Pumping rhythms

OptiRhythm™: Max, Natural, Standard and Gentle
DIY Rhythm 1.0

DIY customisation

Customise suction settings and their duration; save up to 5 rhythms

Heating

HeatFlow™: 7 levels
35–41°C

Charging

Wireless Charging Case 1.0: up to 5 days of pumping*

Collection cup

150 ml

Nipple light

No

Smart milk alerts

No

Massage

No

Flange sizes in the box

24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)

Spare parts

Established parts, easy to find

eufy Wearable Breast Pump S2 Pro

R7,990Sold out

Best for: Exclusive pumping and maximum control
Suction levels: 10 levels (finer steps, not stronger)
Pump battery life: About 6.5 hours

See full specs

Max suction

300 mmHg

Cycle speeds

3 (in the app)

Pumping modes

Stimulation and Expression

Pumping rhythms

OptiRhythm™ 2.0 Flow Curves: Max, Natural, Standard and Gentle
DIY 2.0

DIY customisation

Build a sequence of Stimulation, Expression and Rest phases, setting the level and length of each

Heating

HeatFlow™ 2.0: 7 levels
35–41°C
360° wrap-around warmth
Heats up in about 15 seconds

Charging

Wireless Charging Case 2.0: up to 6 days of pumping*; recharges both pumps about 1.5 times

Collection cup

360° transparent cup, for easier alignment and seeing milk levels

Nipple light

Yes

Smart milk alerts

Yes: stops automatically when full, plus overflow alerts

Massage

VibraPump™ 12 mm massage head
4 modes: Boost, Relieve, Soothe and Fusion
3 intensities

Flange sizes in the box

24 mm flange + 17, 19 and 21 mm inserts (28 mm sold separately)

Spare parts

Newer design; ask us about spares stock

*Charging case figures are eufy's own estimates, based on three 20-minute sessions a day without heating.

Suction Settings

When it comes to breast pump suction, more isn’t necessarily better. The most effective setting is the one that gives you good milk removal while still feeling comfortable — and that can look different from person to person.

All three eufy pumps offer a good range of suction adjustment, but they differ in how finely you can fine-tune the intensity. The E20, S1 and S1 Pro each have 7 suction levels, while the S2 Pro offers 10 levels. All of the eufy pumps in the range can reach up to 300 mmHg of maximum suction, which is exceptionally strong for a wearable breast pump and gives you plenty of power when you need it.

Importantly, these suction settings can be adjusted directly on the pump unit itself, so you don’t need to have your phone or the app open every time you want to increase or decrease the suction.

The S2 Pro isn’t stronger at its maximum — it simply gives you more steps to adjust between, allowing for more precise control over intensity.

This means the real question isn’t “Which pump has the strongest suction?” but rather “Which pump gives me the level of control I need to find my most comfortable and effective setting?”

Eufy E20

The E20 offers 7 suction levels, giving you a good range of intensity to find a setting that feels comfortable and effective for you.

Eufy S1 Pro

The S1 Pro also offers 7 suction levels so the basic suction and speed controls are very similar to the E20.

Eufy S2 Pro

The S2 Pro offers 10 suction levels, compared with 7 on the other models. The additional levels give you more precise control, with smaller adjustments between settings to help you find your ideal intensity.

Cycle Speed

Alongside suction strength, you can also adjust the speed of the pumping cycle. While suction determines how strongly the pump pulls, cycle speed controls how quickly those pulls happen. Being able to adjust both gives you more control over how a pumping session feels and allows you to find a combination that works best for your body.

All three eufy pumps offer 3 cycle-speed settings, which can be adjusted through the eufy app. This gives you more control over the pace of your pumping without needing to physically adjust the pump itself.

The cycle speed also doesn’t work in isolation. eufy’s pumping system combines suction strength, cycle speed and different pumping rhythms or modes to create different patterns of stimulation and milk expression. The exact options and level of customisation vary between the E20, S1 Pro and S2 Pro, which is where some of the more meaningful differences between the pumps begin to emerge.

Standard Pumping Modes

All three eufy pumps — the E20, S1 Pro and S2 Pro — have the same two basic pumping modes: Stimulation Mode and Expression Mode.

Stimulation Mode is designed to mimic the faster, lighter sucking pattern a baby typically uses at the beginning of a feed. The aim is to help stimulate the breast and encourage milk let-down.
Expression Mode is designed for milk removal. It generally uses a slower, stronger suction pattern to help express milk once your milk has started flowing.

You can switch between Stimulation and Expression Mode either through the eufy app or directly on the pump itself, so you don’t need your phone with you every time you want to change modes during a session.

But these two modes are only one part of how the eufy pumping system works.

OptiRhythm™ Technology

OptiRhythm™ is eufy’s system for controlling the overall pattern of suction during a pumping session. Rather than simply choosing how strong the pump feels, OptiRhythm™ changes the way the suction pattern behaves over time — helping create different pumping experiences depending on whether you want to prioritise milk output, mimic a baby’s natural sucking pattern, follow a more traditional pumping sensation, or keep things gentler and more comfortable.

This is separate from suction level and cycle speed. Your suction level determines how strongly the pump pulls, while cycle speed determines how quickly the suction cycles occur. The rhythm sits above these settings, determining the overall pattern of the pumping session. eufy describes the system as allowing you to choose between different rhythms while still adjusting suction intensity and cycle speed to personalise the experience.

The Four Preset OptiRhythm™ Patterns

Across the E20 and S1 Pro, eufy offers four preset OptiRhythm™ options:

Max Rhythm – This is the preset to try if your priority is milk removal and output. It uses a more output-focused suction pattern rather than trying to replicate the way a baby feeds. eufy specifically describes Max as being designed or optimised for maximum milk output
Natural Rhythm – This is designed to make the pumping pattern feel more like a baby’s sucking. Rather than giving you the more predictable sensation of a traditional electric pump, it uses a more natural-feeling pattern intended to mimic infant sucking.
Standard Rhythm – This is the most familiar option if you’ve used a traditional electric breast pump before. It is designed to provide a more conventional electric-pump sensation, making it a good starting point for someone who doesn’t specifically want a more natural or gentler pattern.
Gentle Rhythm – This is the softer option, with a lighter pumping sensation. This is the option for sensitive nipples.

The idea is that there isn’t one pumping pattern that works best for everyone. You can choose the pattern that best matches what you’re trying to achieve, and then fine-tune the suction intensity and cycle speed around it.

Eufy S2 Pro Upgrades to OptiRhythm™ 2.0

eufy designed VibraPump™ to add gentle breast massage while you pump, with the aim of helping relieve fullness and engorgement, encourage milk flow and help empty the breast more efficiently. eufy’s own internal testing found that its 12 mm massage head delivered 1.5× deeper impact and reduced pumping time by around 30% — although these results come from eufy’s testing rather than independent clinical trials.

There is some research showing that gentle breast massage can help with breast pain, engorgement and milk stasis, so the idea behind adding massage isn’t completely without evidence. However, we don’t yet have good evidence that vibration itself is better than gentle manual massage, increases milk supply or actually “clears” blocked ducts.

So, we’d see VibraPump as a potentially useful comfort and breast-emptying feature, rather than something proven to boost supply or clear blocked ducts.

Included Accessories & Flange Size Options & Spares

All three eufy pumps come with the essentials you need to get started, and the core accessories are very similar across the range. Each comes with a 24 mm flange, 17 mm, 19 mm and 21 mm flange inserts, a nipple-sizing card, cleaning brush and two spare valves. A 28 mm flange is also available separately, which is worth considering if you need a larger flange size, but it is not included in the box.

The main difference is in the additional accessories. The E20 comes with a USB-C charging cable, while both the S1 Pro and S2 Pro come with wireless charging cases, making them particularly convenient if you are pumping regularly or travelling. The S1 Pro includes the Wireless Charging Case 1.0, while the S2 Pro comes with the newer Wireless Charging Case 2.0.

It’s also worth thinking about spare parts when choosing a wearable pump. Parts such as the valves and silicone components are consumable, so they will eventually need to be replaced as they wear out, particularly with frequent pumping. The E20 and S1 Pro have been around for longer and use more established components, so replacement parts are generally easier to find. The S2 Pro is a newer model with a more specialised design, so sourcing replacement parts can be a little more complicated at the moment. However, steady supply of S2 Pro spares in South Africa should be available from the beginning of January 2026, which should make this less of a concern for long-term use.

So, Which Eufy Pump Should You Choose?

After looking at all three pumps, the biggest takeaway is that there isn’t one eufy pump that is automatically best for everyone. All three offer strong suction, heating, app control and multiple pumping settings, so even the E20 gives you a surprisingly capable wearable pump without moving into the higher price brackets.

Eufy E20

The E20 makes the most sense if you want a straightforward heated wearable pump with plenty of suction and customisation, without paying extra for features you may not use.

Eufy S1 Pro

The S1 Pro is a great middle ground if you want more precise heating, a charging case and greater control over your pumping rhythms. It gives you many of the features that make the eufy range stand out without going all the way to the S2 Pro.

Eufy S2 Pro

The S2 Pro is the feature-packed option. Its 10 suction levels, more advanced rhythm customisation, transparent design, nipple light, smart milk alerts, HeatFlow™ 2.0 and VibraPump™ make it the most sophisticated of the three. Whether those extras are worth the additional cost really depends on how much you value that extra level of control and convenience.

Our Thoughts

If we strip away the marketing and look at the three pumps practically, the differences are less about “which pump is strongest?” and more about how much control and convenience you want.

All three have more than enough suction for most users, and maximum suction shouldn’t be the deciding factor — higher suction isn’t automatically better, and eufy itself recommends using the highest level that remains comfortable. The S2 Pro’s 10 levels are useful because they give you more room to fine-tune the intensity, rather than because the pump is fundamentally stronger.

The features I’d pay the most attention to are therefore flange fit, comfort, heating, rhythm customisation, battery/charging and how often you plan to pump. The S2 Pro’s VibraPump is an interesting addition, but I’d treat it as a potentially useful comfort and breast-emptying feature rather than a proven way to increase milk supply or clear blocked ducts. Eufy’s own performance claims are based on internal laboratory testing, while the independent evidence for vibration specifically is still limited.

For an occasional or occasional-to-regular pumper, the E20 is arguably the sweet spot: you get the core eufy experience without paying for every extra feature. For someone pumping frequently who wants a charging case and more control, the S1 Pro is the middle ground I’d seriously consider. And for an exclusive pumper or someone who really values maximum adjustability and convenience, the S2 Pro is the most complete package — but you’re paying for refinement and additional features rather than dramatically more suction power.

Ultimately, we’d choose based on how you actually plan to pump, rather than simply choosing the pump with the most features. If you’re primarily looking for reliable everyday pumping, the E20 or S1 Pro may give you everything you need. If you’re an exclusive or frequent pumper and really value fine-tuning, convenience and additional features, the S2 Pro is where the extra investment starts to make more sense.