What Size Glasswasher Does My Pub Need? The Honest Capacity Guide
Buying the wrong size glasswasher is one of the most expensive mistakes you can make behind a bar. Too small and you’re hand-washing pints on a Friday night. Too big and you’ve spent £2,000 more than you needed to. After 15 years running pubs, including managing 180 covers on a Saturday at Teal Farm, here’s the honest guide nobody gives you when the equipment rep is standing in your bar.
How Glasswasher Capacity Actually Works
Manufacturers quote capacity in “baskets per hour.” One basket typically holds 25 glasses. A 350mm machine runs at around 40 baskets per hour. A 400mm machine hits roughly 50-60 baskets per hour. A 500mm machine can push 70+ baskets per hour.
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That sounds generous until you run the real-world numbers.
A “basket per hour” figure assumes back-to-back cycles with no loading time, no unloading time, and no moment where your bar staff are actually serving customers. In a real pub, knock that headline figure down by 30-40%. A 400mm machine rated at 60 baskets per hour will realistically deliver around 36-40 usable cycles per hour during a genuine push.
The Busy Friday Night Test
Here’s the calculation I use. On a busy Friday evening, assume each customer uses 3 glasses over the course of their visit. In a 50-cover pub operating at capacity, you’re generating roughly 150 dirty glasses per hour at peak. At 25 glasses per basket, that’s 6 baskets per hour. A 350mm machine handles that easily, even with the real-world efficiency reduction applied.
Now scale that up. At Teal Farm, we’re pushing 180 covers on a Saturday. Add bar-only drinkers and the number climbs fast. We’re generating 400-500 dirty glasses per hour at absolute peak. That’s 16-20 baskets per hour. Even a 350mm machine can technically keep pace on paper, but you have zero margin for a staff member who’s slow to unload, a basket jam, or the inevitable queue of returned glasses from a round of shots nobody wanted.
This is why we run a 500mm machine. The headroom matters more than the average throughput.
Which Size for Which Pub
350mm – Right for a pub doing under 60 covers, low drinks-per-head average, or a venue where beer bottles and cans dominate over draught pint glasses. Works well for a small restaurant bar or a quiet local. Cheaper to buy, cheaper to run, easier to fit in a tight bar layout.
400mm – The working sweet spot for most pubs. Covers the 60-120 cover range comfortably. If you’re a community local doing decent weekend numbers without a late licence, this is almost certainly your machine. The [Buffalo 400mm glasswasher](https://amzn.to/4ukKRuU sits in this category and is a sensible commercial-grade option worth looking at before you commit to a full dealer quote.
500mm – For anything above 120 covers, a late licence, or a venue running sport events where drinks volume spikes hard. Also worth considering if you run quiz nights or themed evenings where glass turnover bunches into short windows rather than spreading across the evening.
The Drain Pump Rule
Always specify a built-in drain pump. Without one, your glasswasher relies on gravity to empty, which means you’re restricted on where the machine can be positioned and you risk drainage problems whenever the outlet run isn’t perfectly graded. With a drain pump, the machine empties reliably regardless of where it sits under the bar. It adds a small amount to the purchase cost and saves genuine operational misery. Do not skip it.
The Other Numbers You Need to Have Right
Getting the glasswasher right is one piece of the bar operation puzzle. The bigger picture is knowing your labour percentage, VAT position, and cash flow in real time rather than at month end when the damage is already done.
Before you sign anything, know your numbers. Pub Command Centre: real-time labour %, VAT and cash position from day one. £97 once.
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