Pick the Lingkong K3 for large industrial skylight runs over 800 m² with slopes up to 25 degrees. Pick the Lingyun Y3 for atrium and commercial glazing under 25 m where panel spans are shorter and access for setup is tight.
Both are built by Lingdu Intelligence and both clean glass roofs robotically. The difference is not a marketing tier. It is a 4 to 6 kg mass gap, a different tank size, and two genuinely different jobs.
What separates the Lingkong K3 from the Lingyun Y3?
Mass and water. The K3 carries a bigger tank and a wider cleaning head, which is why it holds a line longer but needs more hold to stay on pitch. The Y3 trades tank volume for a lighter chassis that two people can lift onto a roof without a hoist.
| Spec | Lingkong K3 | Lingyun Y3 |
|---|---|---|
| Operating mass | 18-21 kg | 14-16 kg |
| Working slope | up to ~25° | up to ~15° |
| Cleaning width | wider head, fewer passes | narrower, better around obstructions |
| Water capacity | larger tank, longer run | smaller tank, refill checks |
| Best fit | factory strips, big roofs | atria, malls, transport hubs |
Which machine handles steep glazing better?
The K3, and it is not close. Above 15 degrees the Y3 starts to feel the downslope pull on wet glass, and drivers end up reducing speed to keep the pads seated. On a 22-degree sawtooth factory roof the K3 just works. On a flat atrium the Y3 is faster to deploy and easier to steer around structural fins.
Both machines track vacuum level and halt if a pad loses seal. That safety behaviour is the same across the range, which matters more than the headline spec when you are standing 18 m below the machine.
How much does each one cost in 2026?
Neither vendor publishes list prices, and that is normal for this category. Realistic 2026 ranges for machines in this class land between USD 12,000 and USD 30,000 depending on head width, tank size, remote options and whether you buy a hoist. The K3 tends toward the upper half of that band, the Y3 the middle.
The number that decides the purchase is not the sticker. It is cost per square metre over five years. If you clean 1,200 m² six times a year, a K3 at the higher price usually beats a Y3 on total cost, because fewer refill stops and fewer passes cut labour hours on every visit. Our cost and payback breakdown runs the arithmetic in full.
Who should buy which
Buy the K3 if your roof is flat to moderately pitched, over 600 m², and you have a fixed water point and power within 30 m. Buy the Y3 if your site is a shopping centre or airport concourse where glazing is broken into sections, access is awkward, and two technicians need to set up without a crane.
Do not buy either if your glazing is single-pane, if the frames step more than 5 mm between units, or if nobody on site will own the weekly pad inspection. A dusty pad on either machine is how roofs get damaged.
What to test before you sign
- Run both on a wet sample panel at your actual pitch, not a demo rig.
- Time a full clean cycle including refill and repositioning, not just the pass rate.
- Check the water filtration setup — grit in the tank scratches coatings.
- Confirm spare pad and brush delivery lead times in your region.
If you want a side-by-side quote, start with the contact form. Bring your panel schedule and roof drawings; the answer changes a lot once someone sees the drawings.
What does the 2026 price gap pay for?
The K3 costs more because of the bigger pump, wider head and heavier frame. You are buying coverage and slope tolerance, and on a large roof that shows up as fewer nights on site. The Y3 costs less and does less, which is not a criticism — for an atrium with a fixed access route, the extra capability of a K3 buys nothing you can use.
How do you decide between buying one and hiring?
If your roof is cleaned two or three times a year and is under 2,000 m2, hiring a cleaning contractor that already owns a machine often beats buying. You pay per visit and carry no maintenance. Above roughly 3,000 m2 with four or more cleans a year, ownership starts to win on both cost and control of schedule.
How do you compare two quotes fairly?
Strip both quotes to the same scope: machine, spare pads and brushes, filtration, tether and anchor, training, warranty and spare-part lead times. Vendors quote wildly different packages, so a lower price often just means fewer spares and shorter support. Ask each to state coverage per shift against a roof like yours, in writing. The vendor who hesitates on that number is the one to leave out of the shortlist.
What does a typical cleaning cycle look like?
A full cycle is more than the time the machine spends cleaning. It is the walk to the roof, the water fill, the boundary setup, the run itself, and the pack-down. On a well-mapped roof the setup is 20 minutes and the run dominates. On a difficult roof with restricted access it can be 45 minutes before the machine lays down its first pass. Budget the whole cycle, not the pass, when you plan a shift.
Key Takeaways
- K3: heavier, wider head, handles slopes to about 25 degrees, built for large industrial roofs.
- Y3: lighter, easier to deploy, best on atria and flat commercial glazing below 15 degrees.
- Typical 2026 price band for this class is USD 12,000-30,000.
- Decide on five-year cost per square metre, not purchase price.
- Neither machine fixes stepped frames or single-pane glazing.