Buy a Glasswasher: Basket Size, Drain Pump & Water — The Guide
Cloudy wine glasses, foam collapse in beer glasses, lipstick on the rim — at the bar the glass plays a key role in the overall impression of the operation. A glasswasher solves exactly this problem: short programmes, gentle temperatures, streak-free shine. This guide explains how it differs from a dishwasher, which basket size you need, when a drain pump is mandatory, and why often water ultimately determines the shine — with real prices from our range.
Glasswasher or Dishwasher — what is the difference?
Both look almost the same as undercounter units but are built for different tasks. The dishwasher must remove grease and food residue from plates and works with high chemical and heating power. With glass, it’s different: beer and beverage residues dissolve easily, but the material is sensitive — too aggressive alkali makes glasses go cloudy over time, and a freshly hot washed beer glass immediately causes the foam to collapse.
| Glasswasher | Dishwasher | |
|---|---|---|
| Basket size | 350 × 350 or 400 × 400 mm | typically 500 × 500 mm |
| Programme duration | short — typically 90 to 180 seconds | longer, stronger cleaning performance |
| Wash cycle | gentle, often with cold final rinse for beer glass | hot clear rinse for hygiene with food residues |
| Connection | almost always 230 V socket | often 400 V three-phase |
| Space requirement | from about 40 cm width, fits under any counter | from approx. 60 cm width |
Whoever washes plates and glasses in quantity needs both machines — or chooses a dishwasher for the kitchen and installs the glasswasher at the bar. Which design suits the kitchen (undercounter, hood, pass-through) is explained in the guide commercial dishwashers.
Basket Size and Insertion Height: The Two Key Dimensions
Basket size 350 × 350 mm: the compact class for bars with little space. Depending on glass shape, about 9 to 16 glasses fit in the basket — usually enough for cafés, bistros and smaller bar operations.
Basket size 400 × 400 mm: about 30 percent more surface per wash cycle. The right choice if baskets run in sequence in the evening — for example in bars, pubs or restaurants with their own bar area.
Insertion height: The often overlooked dimension. Many glasswashers accept glasses only up to about 26–27 cm height — but a wheat beer glass or a tall long drink glass fails in some compact models. Measure your tallest standard glass and compare with the "maximum glass height" specified in the data sheet.
Throughput roughly calculated: With a 120-second programme the machine processes 30 baskets per hour — with the 400 basket that means about 400 to 700 glasses. That’s enough for most bars; the limiting factor is usually who loads and unloads.
Features: Dosing Pumps, Drain Pump, Descaler
Dosing pumps for detergent and rinse aid are standard recommendations today: they automatically draw chemicals from the container and dose constantly. Manual dosing fluctuates — and fluctuating dosing shows on the glass first.
Drain pump: Without a pump the water drains by gradient, so the siphon must be below the machine drain. Many bars have the wall connection higher — then the drain pump is not an option but a requirement. Checking under the counter before purchase saves a rebuild afterwards.
Built-in descaler: Some models come with water softening integrated — practical with medium water hardness, as the external softener cartridge is no longer necessary.
Cold final rinse: A real argument for bar operations: after the hot wash cycle the machine rinses with cold water, so the glass comes out ready tempered from the basket and the next beer can be tapped immediately.
Water Determines the Shine
Streaks and deposits on the glass rarely come from the machine — almost always from the water. From about 7 °dH water softening is worthwhile; otherwise lime scales glasses and boiler. For perfect, polish-cloth-free shine bars count on reverse osmosis: the desalinated water dries without residues, making polishing unnecessary. Which treatment stage suits your water hardness is calculated in the guide Water treatment: Softening & Filters.
For maintaining the machine itself — daily emptying, filters, weekly cleaning — the article clean & maintain commercial dishwasher provides step-by-step instructions.
How Much Does a Glasswasher Cost?
Our range currently spans from about
| Class | Price Range at Gastro-Nik |
|---|---|
| Entry level with dosing pumps (350 basket) | approx. €950 – €1,200 |
| Mid-range 400 basket, digital, drain pump | approx. €1,200 – €1,900 |
| Premium, double-walled, full equipment | up to approx. €3,900 |
We advise against household devices behind the bar — the reasons (programme duration, continuous operation, warranty in commercial use) are explained in the article household vs pro devices.
Frequently Asked Questions
Can I simply wash glasses in the dishwasher?
Possible, but rarely recommended: the more aggressive chemicals and the hot clear rinse leach glasses over time (glass corrosion), and hot glasses are unusable for tapping. Where large volumes are served daily, the glasswasher plays out its short, gentle programmes.
What basket size do I need?
350 × 350 mm is enough for cafés and bistros with limited serving. If the bar runs in rhythm in the evening, choose 400 × 400 mm — about 30 percent more glasses per wash cycle with hardly more footprint. More important than area is often the maximum glass height: measure wheat and long drink glasses beforehand.
Do I need a drain pump?
Whenever the wall drain is higher than the machine's drain outlet — this is common at bars. If there is a floor drain or a deep siphon, it can work without.
What electrical connection is needed?
Glasswashers almost always operate from a standard 230 V socket. This also makes them interesting for bars without three-phase power.
Why are my glasses not streak-free?
Usually it’s the water, not the machine: too hard water or too many dissolved salts. A softener cartridge remedies this from medium hardness; reverse osmosis delivers polish-cloth-free shine. The rinse aid dosing is also worth checking.
Matching Devices at Gastro-Nik
An overview of our range — all with complete technical data:
- Universal Glasswasher with Dosing Pumps | A&S Gastro — the price entry with full basic equipment
- Glasswasher 35 × 35 cm | Maxima — compact for small bars
- Glasswasher MÜNCHEN | Saro — the proven classic
- Glasswasher Ready 405 | KBS — 400 basket, two programmes (90/120 s)
- Glasswasher with Descaler & Drain Pump | Virtus — full equipment including built-in softening
All models from A&S Gastro, KBS, Maxima, Saro and Virtus at a glance: Glasswashers. Matching baskets and spike rods can be found under Wash baskets & Accessories.
We find the right machine for your bar
Send us the height of your tallest glass, the niche under the counter, and a photo of the water connection — we will tell you which device fits, whether you need a drain pump, and which water treatment is worthwhile.
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Last updated on 2 September 2026.