Compare Roborock S8 Pro Ultra Robot Vacuum and Mop vs Yeedi S14 Plus Robot Vacuum

P1 Roborock S8 Pro Ultra Robot Vacuum and Mop
P2 Yeedi S14 Plus Robot Vacuum

Comparison Takeaways

Roborock S8 Pro Ultra Robot Vacuum and Mop

Where It Has the Edge

  • Maintenance requirements is 4.5 vs 3.9. Maintenance requirements are lower than typical robot vac+mop combos due to automated dock tasks, but periodic work remains:...
  • Assembly and Setup is 4.7 vs 4.2. Assembly and setup are generally described as straightforward, with minimal physical assembly and simple app pairing, though some...
  • Carpet — High-Pile Pickup is rated 4.3 while the other product has no score yet. High-pile carpet handling and pickup are frequently described as strong for a robot, but plush carpets can still...
  • Hard Floor — Fine Dust Pickup is rated 4.2 while the other product has no score yet. Fine dust pickup on hard floors is generally good for everyday use, but flour-like powders can smear or...

Yeedi S14 Plus Robot Vacuum

Where It Has the Edge

  • Fresh Liquid Pickup Speed is 4.6 vs 2.8. The roller system is repeatedly credited with better handling of wet messes because it can scrub while reclaiming...
  • Crevice / Groove Pickup (Hard Floors) is 4.7 vs 3.2. Several tests report strong pickup along trim and into narrow gaps, helping it clean edges where debris collects.
  • Streaking / Residue is 4.3 vs 2.9. Streaking and residue control is usually a strength of the roller mop because it leaves less water behind,...
  • Under-Furniture Pickup is 4.5 vs 3.2. The flatter top design helps it reach under more furniture in some homes, improving coverage where taller lidar-tower...
Average score
Product 1: Roborock S8 Pro Ultra Robot...
3.9
Product 2: Yeedi S14 Plus Robot Vacuum
4.3
Accessories and Tools
Product 1: Roborock S8 Pro Ultra Robot...
3.2

Included accessories are often viewed as light for the price (limited spares like filters/mops), though replacement parts are widely available from official and third-party sources.

Product 2: Yeedi S14 Plus Robot Vacuum
4.0

Replacement and upkeep items are available as kits including brushes, filters, bags, and a roller mop, which helps with long-term maintenance planning.

Adaptive chassis lift
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.4

Threshold handling is described as capable for typical door transitions, with some reviewers noting it can climb modest height changes without drama.

Aesthetic design and finish
Product 1: Roborock S8 Pro Ultra Robot...
4.3

Design and finish are usually described as sleek and premium, with the robot available in black/white and the dock seen as modern but physically large.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Most reviews like the flagship look, often calling out the black and rose-gold styling and a more squared, modern station design, though the overall footprint is still large for a mop-capable system.

AI, Smart, App and Automation
Product 1: Roborock S8 Pro Ultra Robot...
4.3

Smart features are a major strength: routines, per-room customization, schedules, multi-map support, 3D mapping options, and voice assistant compatibility are frequently mentioned. A minority report friction with assistant setup or firmware quirks.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

App features are broadly considered flagship-level, including mapping, scheduling, room-by-room control, and detailed cleaning settings, though a minority report stability or editing limitations.

Area Rug Handling
Product 1: Roborock S8 Pro Ultra Robot...
3.3

Area rug handling is generally solid on common rugs, but tassel/fringe rugs and some cords can still trap or snag the robot, leading to notifications or manual rescue in certain homes.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

Mop lifting helps keep many low rugs and some medium-pile carpets drier during mixed-floor runs, though very plush rugs may still need caution.

Assembly and Setup
Product 1: Roborock S8 Pro Ultra Robot...
4.7

Assembly and setup are generally described as straightforward, with minimal physical assembly and simple app pairing, though some users spend time refining room splits and map edits to their liking.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

Setup is generally straightforward, but several reviews mention minor hiccups such as Wi-Fi pairing retries, initial docking alignment, or the robot briefly failing to find the base.

Bag-full indicator
Product 1: Roborock S8 Pro Ultra Robot...
2.0

Bag-full indication is a weak spot in reviewer expectations: some call out wanting clearer notifications or indicators for capacity-related events, especially given the premium price.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Battery and Charging
Product 1: Roborock S8 Pro Ultra Robot...
4.0

No summary yet.

Product 2: Yeedi S14 Plus Robot Vacuum
3.9

Battery performance is generally adequate for typical spaces and supports recharge-and-resume, but measured efficiency is not best-in-class and max-power modes can drain faster.

Bin and Bag
Product 1: Roborock S8 Pro Ultra Robot...
4.4

Bin and bag design is viewed favorably for hands-off use: the internal bin is supported by reliable auto-emptying into a larger dock bag, reducing manual emptying frequency. Some wish for better in-run fullness handling or clearer indicators.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

The dock uses a disposable bag system that can go weeks to months between changes, but the robot’s onboard bin is small in some tests, making the dock more important for heavy hair or debris.

Build quality and durability
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.6

Build quality is described as solid but not as premium-feeling as some top-tier rivals, with concerns centering on plastics and long-term wear of fixed components.

Carpet — High-Pile Pickup
Product 1: Roborock S8 Pro Ultra Robot...
4.3

High-pile carpet handling and pickup are frequently described as strong for a robot, but plush carpets can still pose issues due to the mop module design and lift limits when mopping modes are involved.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Carpet — Low-Pile Pickup
Product 1: Roborock S8 Pro Ultra Robot...
4.4

Low-pile carpet pickup is often reported as above-average to excellent in standardized testing and daily use, though not always class-leading in deep-clean style tests.

Product 2: Yeedi S14 Plus Robot Vacuum
4.4

Low-pile carpet cleaning is generally strong for everyday debris and hair, though deep extraction is not always leading its category.

Carpet — Medium-Pile Pickup
Product 1: Roborock S8 Pro Ultra Robot...
4.1

Medium-pile carpet performance is generally good, but a few reviewers expected more deep-cleaning power versus prior flagships or competitors, especially in sand-embedded style testing.

Product 2: Yeedi S14 Plus Robot Vacuum
3.9

Carpet deep-clean results are generally good but not class-leading in at least one benchmark, landing closer to average when extracting deeply embedded grit.

Child lock
Product 1: Roborock S8 Pro Ultra Robot...
4.0

No summary yet.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Clogging and debris prevention
Product 1: Roborock S8 Pro Ultra Robot...
3.2

Clogging/debris prevention is usually solid, but a few reports mention rare events like clumps left behind or jams that required intervention, especially when encountering cords, socks, or concentrated debris.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Comparative performance
Product 1: Roborock S8 Pro Ultra Robot...
4.0

Comparative performance is generally strong versus many peers and earlier generations, especially for automation and navigation. However, multiple sources note it can be a step back in certain areas (cord avoidance, plush carpet compatibility, or missing monitoring features) depending on what you value.

Product 2: Yeedi S14 Plus Robot Vacuum
4.4

Compared to pricier flagships, reviews often position it as competitive on suction and especially strong on mopping, with navigation and battery being the main areas where it may trail.

Controls and UI
Product 1: Roborock S8 Pro Ultra Robot...
4.4

Controls and UI are broadly viewed as feature-rich and usable. The app supports fine-grained control (zones, rooms, power/scrub settings, dock behavior), though a few reviewers describe some menus or map edits as finicky.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Controls lean heavily on the app, which reviewers generally find clear and full-featured, though a few report quirks when editing maps or managing rooms.

Corner Cleaning (Robot)
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.7

Corner performance is consistently strong, aided by an extending side brush and edge-focused behaviors that improve coverage in tight angles.

Crevice / Groove Pickup (Hard Floors)
Product 1: Roborock S8 Pro Ultra Robot...
3.2

Crevice/groove pickup is inconsistent across evaluations, with at least one test source calling it weaker than expected versus prior Roborock models, suggesting certain edge-case pickup scenarios may lag overall performance strengths.

Product 2: Yeedi S14 Plus Robot Vacuum
4.7

Several tests report strong pickup along trim and into narrow gaps, helping it clean edges where debris collects.

Dirty water sensor
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.8

Dirty-water related alerts help prompt tank emptying, but at least one reviewer found the wording confusing at first.

Docking and Auto-Empty Reliability (Robot)
Product 1: Roborock S8 Pro Ultra Robot...
4.6

Across reviews, the RockDock Ultra is consistently described as reliable and genuinely automating ownership: auto-emptying, mop washing, water refilling, dirty water collection, and hot-air drying generally work as intended, with only occasional complaints about edge-case behavior or loud emptying.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Docking and automation are strong overall, handling emptying, tank management, and mop care, but a few reviews mention first-run docking alignment issues or occasional base-finding quirks.

Dock noise
Product 1: Roborock S8 Pro Ultra Robot...
3.3

Dock noise is a common downside: auto-emptying is repeatedly described as very loud for a short burst, while mop washing can add noticeable gurgling/operational sounds. Day-to-day dock function is valued despite the noise.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Dried-On Stain Removal
Product 1: Roborock S8 Pro Ultra Robot...
4.3

Dried-on stain removal is competitive among premium robot mop systems in comparative testing, with the S8 Pro Ultra placing near the top group in multi-run stain scoring. It is strong, but not always the outright best versus the newest top performers.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Dried-on stain performance is a major strength in tests, especially for coffee-type marks, though very large spills can still create messy edge cases near the dock.

Ease of use
Product 1: Roborock S8 Pro Ultra Robot...
4.8

Ease of use is a key strength: setup is commonly described as quick, daily upkeep is low thanks to the dock, and scheduling makes it close to ‘set-and-forget’ for many homes. A minority report app learning curve or occasional intervention for tangles/stuck events.

Product 2: Yeedi S14 Plus Robot Vacuum
4.4

Ease of use is generally high once set up, with flexible cleaning presets and clear in-app settings that make it simple to choose quick or deep cleans.

Edge and Baseboard Cleaning (Hard Floors)
Product 1: Roborock S8 Pro Ultra Robot...
3.4

Edge and baseboard cleaning is generally good but not perfect; some real-home reports note crumbs near walls or under cabinet toe-kicks can be missed depending on clearances and layout.

Product 2: Yeedi S14 Plus Robot Vacuum
4.7

Edge and baseboard cleaning is a standout, helped by extending brushes and an edge-focused roller-mop design that reaches closer to walls than many rivals.

Emptying and Mess Control
Product 1: Roborock S8 Pro Ultra Robot...
3.3

No summary yet.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Auto-emptying into a bag and contained disposal are praised, though very large spill cleanups can leave some mess near the dock during the return-to-base process.

Floor Drying Time
Product 1: Roborock S8 Pro Ultra Robot...
4.6

Floor drying time is generally reported as fast, with only a light amount of water left behind in typical mopping, and the dock’s drying system helps keep the mop pad dry between runs.

Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Drying time is generally fast thanks to lower residual water left by the roller system and controlled water delivery.

Fresh Liquid Pickup Speed
Product 1: Roborock S8 Pro Ultra Robot...
2.8

Fresh liquid pickup speed is not a standout: multiple reviews note larger wet spills or sticky liquids can be spread rather than quickly lifted/contained, which is typical for many robot mop systems.

Product 2: Yeedi S14 Plus Robot Vacuum
4.6

The roller system is repeatedly credited with better handling of wet messes because it can scrub while reclaiming dirty liquid rather than spreading it around.

Hair Pickup — Carpets
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.9

Carpet pet-hair pickup is repeatedly excellent in testing, outperforming many combo robots on flattened hair benchmarks.

Hair Pickup — Hard Floors
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Hair pickup on hard floors is consistently rated strong, especially in homes with shedding pets.

Hair‑Wrap / Tangle Resistance
Product 1: Roborock S8 Pro Ultra Robot...
3.7

Hair-wrap resistance is mixed but trends positive: dual rubber rollers help, and removable end caps make hair removal easier. Some tests still find tangling or only mid-pack detangling versus certain alternatives.

Product 2: Yeedi S14 Plus Robot Vacuum
4.8

Anti-tangle performance is a major highlight, with combing/cutting or active removal features reducing brush wrap even with long hair.

Hard Floor — Fine Dust Pickup
Product 1: Roborock S8 Pro Ultra Robot...
4.2

Fine dust pickup on hard floors is generally good for everyday use, but flour-like powders can smear or remain in some tests, suggesting performance varies with particle type and whether mopping is enabled.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Hard Floor — Large Debris Intake
Product 1: Roborock S8 Pro Ultra Robot...
4.2

Large debris pickup on hard floors is typically strong, with most reviews reporting solid crumb and debris collection. Some edge cases remain (near walls or under low cabinets) depending on layout and clearances.

Product 2: Yeedi S14 Plus Robot Vacuum
4.4

Large debris and everyday tracked-in mess are generally picked up easily, but side-brush scattering can occur with certain medium items on hard floors.

Heating element
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Hot-water washing and hot-air drying in the dock are repeatedly called out as premium features that help keep the roller mop cleaner and reduce manual scrubbing.

Innovation compared to competitors
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Innovation is most often credited to the extendable roller-mop approach and the dock’s hot-wash/hot-dry automation, which differentiate it from many spinning-pad designs.

Low-profile design
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.0

Low-profile claims are mixed: some reviewers appreciate the flat-top design for furniture reach, while others note its measured height is not dramatically slimmer than many lidar-tower bots.

Maintenance requirements
Product 1: Roborock S8 Pro Ultra Robot...
4.5

Maintenance requirements are lower than typical robot vac+mop combos due to automated dock tasks, but periodic work remains: water tanks, dust bags, wiping sensors, and occasional hair/brush cleaning.

Product 2: Yeedi S14 Plus Robot Vacuum
3.9

Day-to-day maintenance is mostly hands-off due to the dock, but occasional manual cleaning is needed after unusual messes and some reviewers dislike components that are harder to remove or service.

Map and Path Efficiency (Robot Vacuums)
Product 1: Roborock S8 Pro Ultra Robot...
4.3

Mapping and path efficiency are repeatedly highlighted as a top-tier trait: fast mapping, accurate tracking, and efficient coverage patterns are common praise points. Some long-term reports note maps can get messy after certain stuck events, but rollback/edits help.

Product 2: Yeedi S14 Plus Robot Vacuum
4.1

Mapping and path efficiency are usually rated as solid and fairly fast, but a few reviews report occasional map oddities, less-direct routes than premium leaders, or rare moments of confusion.

Mop lifting system
Product 1: Roborock S8 Pro Ultra Robot...
4.3

The mop lifting system is a key benefit for mixed floors: many reviews report it keeps carpets mostly dry and enables combined vacuum+mop runs. Limitations are noted for higher-pile rugs where lift height may still allow contact or dampening.

Product 2: Yeedi S14 Plus Robot Vacuum
4.5

Automatic mop lift enables mixed hard floor and carpet cleaning in one run, and reviewers generally find it effective for keeping carpets from getting wet.

Mopping performance
Product 1: Roborock S8 Pro Ultra Robot...
4.1

Mopping performance is widely described as excellent for daily maintenance (dust, footprints, light smudges) with the vibrating system and frequent mop washing. Multiple sources caution that sticky/heavy spills can smear and may require manual cleanup.

Product 2: Yeedi S14 Plus Robot Vacuum
4.5

Mopping is consistently the hero feature, with the roller mop delivering strong stain removal, good edge reach, and better wet-mess handling than many pad-based designs.

Noise level
Product 1: Roborock S8 Pro Ultra Robot...
3.7

Cleaning noise is usually characterized as average-to-moderate depending on power mode, with higher suction on rugs/carpet increasing audibility. Several sources note it can disrupt conversation when nearby on higher settings.

Product 2: Yeedi S14 Plus Robot Vacuum
4.7

Multiple reviewers highlight unusually quiet operation for a vacuum-mop robot, making it easier to run while people are home.

Obstacle Avoidance (Robot)
Product 1: Roborock S8 Pro Ultra Robot...
3.8

Obstacle avoidance is the most debated area. Many tests show strong performance for common clutter, but cords and certain small objects remain a recurring failure mode, and some long-term users report more snagging than prior camera-based models.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

Obstacle avoidance is above average with camera and 3D sensing, but thin cables and strings remain a common weakness across real homes.

Odor control
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.1

Odor experiences are mixed: hot-air drying is intended to reduce musty smells, but a few reviewers noticed a temporary plastic or warm-material smell during early use.

Ongoing ownership costs (bags, filters, batteries)
Product 1: Roborock S8 Pro Ultra Robot...
3.9

No summary yet.

Product 2: Yeedi S14 Plus Robot Vacuum
3.9

Ongoing costs are viewed as manageable, with periodic replacement of bags, filters, brushes, and the roller mop being the main recurring expenses.

Packaging quality
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Packaging is often praised for being easy to unbox and more eco-friendly than typical, with reduced foam and less waste, plus protective outer boxing in some cases.

Pet-Ready Features
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
4.8

Reviewers consistently call it pet-friendly, citing strong day-to-day hair pickup and systems designed to keep hair from bogging down performance.

Price and Value
Product 1: Roborock S8 Pro Ultra Robot...
3.3

Price and value are consistently framed as premium and expensive. Many feel the automation justifies the cost, while others believe quirks (cords, plush carpet limitations, or missing extras) make it harder to justify at full MSRP.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

Value is frequently framed as strongest when discounted, delivering many flagship features and mopping performance at a lower price than top competitors.

Privacy controls
Product 1: Roborock S8 Pro Ultra Robot...
4.1

Privacy tradeoffs are discussed favorably by some: reduced/changed camera approach and lack of remote home monitoring is seen as a privacy plus, while others consider the removed monitoring feature a downgrade.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Scratch resistance
Product 1: Roborock S8 Pro Ultra Robot...
2.5

Scratch resistance gets mixed attention: at least one test source raised concerns about potential floor scratching at high scrub settings, while others did not report damage. Cautious settings and monitoring on delicate floors are commonly advised.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Self-cleaning cycle
Product 1: Roborock S8 Pro Ultra Robot...
4.6

Self-cleaning behavior (mop washing and dock cleaning routines) is widely praised, with multiple sources highlighting that the mop is cleaned during/after runs and dries over time to reduce odors and upkeep.

Product 2: Yeedi S14 Plus Robot Vacuum
4.6

Self-cleaning behaviors are a core highlight, with automated mop washing/drying and dock-assisted upkeep reducing the need for frequent manual cleaning.

Software-update support / feature longevity
Product 1: Roborock S8 Pro Ultra Robot...
3.7

Feature longevity via updates is mentioned as important because some shortcomings (obstacle avoidance edge cases, map quirks) appear firmware-related. Several reviewers express hope or expectation that updates can improve behavior over time.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Solution / Liquid system
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.2

Some reviews note the lack of a detergent tank or cleaning-solution system, which may matter to users who prefer mopping with solution rather than water-only cleaning.

Storage footprint and upright-stand stability
Product 1: Roborock S8 Pro Ultra Robot...
3.4

Storage footprint is a frequent complaint: the dock is large and needs clearance to operate comfortably, which can be an eyesore or space issue in smaller homes.

Product 2: Yeedi S14 Plus Robot Vacuum
No score yet
Streaking / Residue
Product 1: Roborock S8 Pro Ultra Robot...
2.9

Streaking/residue concerns appear mostly in heavier spill or smear scenarios (e.g., sticky foods). For normal mopping, most report clean-looking floors with minimal residue when settings are appropriate.

Product 2: Yeedi S14 Plus Robot Vacuum
4.3

Streaking and residue control is usually a strength of the roller mop because it leaves less water behind, but a few reviewers notice visible tracks on light floors.

Stuck resistance
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.5

Stuck resistance is good in normal homes but not flawless; cables, strings, and some tight furniture layouts can still snag the robot or trigger recovery events.

Suction and Airflow
Product 1: Roborock S8 Pro Ultra Robot...
4.3

Suction and overall vacuuming performance are usually rated strong, especially for daily debris on mixed surfaces. A few sources note deep-cleaning in specific tests or certain fine debris scenarios can be less impressive than expected for the price.

Product 2: Yeedi S14 Plus Robot Vacuum
4.7

Across reviews, suction is repeatedly described as very strong for the class and effective on daily dirt, dust, and pet hair. A few testers note that high power can contribute to side-brush scattering with certain debris on hard floors.

Suitability for small spaces
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.6

The dock delivers strong automation but takes up meaningful space, so small homes may need to plan placement carefully.

Support and Reliability
Product 1: Roborock S8 Pro Ultra Robot...
No score yet
Product 2: Yeedi S14 Plus Robot Vacuum
3.4

Reliability sentiment is mostly positive in daily use, but some reviewers express concern about warranty support or long-term serviceability of non-removable parts.

Under-Furniture Pickup
Product 1: Roborock S8 Pro Ultra Robot...
3.2

Under-furniture pickup is limited by clearance: several users report it performs well under many items, but cannot reach under very low cabinets or tight toe-kick spaces, leaving some debris behind.

Product 2: Yeedi S14 Plus Robot Vacuum
4.5

The flatter top design helps it reach under more furniture in some homes, improving coverage where taller lidar-tower robots may miss.

Water tank
Product 1: Roborock S8 Pro Ultra Robot...
4.4

Water tank capacity and the clean/dirty tank system are repeatedly described as generous and convenient, enabling multiple cleans before intervention. Users still need to refill/empty on a cadence based on home size and mop settings.

Product 2: Yeedi S14 Plus Robot Vacuum
4.2

The dual-tank dock system is praised for making mopping more hands-free, though refill/empty frequency varies and some reviewers note fill lines or tank access could be clearer.