Glasswasher vs Dishwasher for Pubs: Which Do You Actually Need?
If you’re fitting out a new bar or replacing ageing kit, this question comes up constantly. The short answer is that a glasswasher and a commercial dishwasher are not interchangeable, and getting it wrong costs you money in broken stock and slow service.
Here’s what fifteen years behind the bar actually taught me.
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Why Dishwashers Destroy Pub Glasses
A commercial dishwasher runs at 60–85°C wash temperature, sometimes higher on the final rinse cycle. That thermal shock — combined with the mechanical pressure of the spray arms — is brutal on glassware. You’ll see it as clouding first, that milky film that no amount of polishing shifts. Then micro-fractures appear around the rim. Eventually glasses start chipping or cracking mid-service, which is a food safety issue as much as a cost issue.
At Teal Farm on a busy Saturday (we’re pushing 180 covers), a cloudy pint glass goes back. It looks dirty even when it’s clean. That costs you more than the glass — it costs you the customer’s confidence.
The alkaline detergents used in standard dishwashers accelerate this damage significantly. Glasswasher chemicals are formulated at lower pH specifically to protect glassware.
Temperature and Cycle Speed: The Numbers That Matter
| Glasswasher | Commercial Dishwasher | |
|---|---|---|
| Wash temp | 45–55°C | 60–85°C |
| Rinse temp | 65–75°C | 80–90°C |
| Cycle time | 90–120 seconds | 3–5 minutes |
| Rack capacity | 25–40 glasses | Mixed, fewer glasses |
That cycle time difference is everything during a Saturday rush or straight after last orders at quiz night. A glasswasher turns a rack around in under two minutes. You’re back in service before a dishwasher has even finished its pre-wash.
The Drain Pump Rule
Whatever glasswasher you buy — budget or premium — specify the drain pump option. Most entry-level machines rely on gravity drainage, which requires the waste outlet to sit below the machine. In most bar builds that’s a problem, and you’ll end up with a machine that won’t drain properly, pools water, and becomes a hygiene issue fast.
A drain pump costs a small amount extra upfront and saves you a world of grief. I won’t put a glasswasher in without one. It’s non-negotiable.
Cost Comparison
Entry-level undercounter glasswashers start around £400–£700 for a basic machine. A decent mid-range unit with a drain pump sits between £800–£1,500. Commercial dishwashers that could theoretically handle glasses start at similar prices but run higher on chemical costs and glass replacement.
The real cost comparison isn’t machine price — it’s glass breakage, chemical spend, and lost service speed over 12 months. A glasswasher pays for itself in glass stock alone within the first year at any serious volume.
For a reliable undercounter option worth looking at: Smeg LLPE61 Undercounter Glasswasher on Amazon — solid build, suitable drain pump configuration, straightforward to run.
The Verdict
Use a glasswasher behind the bar. Full stop. A dishwasher belongs in the kitchen for plates, pots and cutlery. Mixing the two is a false economy that shows up in your glass stock budget and your customer’s pint.
If you’re running any kind of volume — weekend trade, quiz nights, sport on the screens — a dedicated glasswasher is basic infrastructure, not a luxury.
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