What is wine on tap?
Quick answer
Wine on tap means serving wine from stainless-steel kegs (10-30 litres) through a draught system pressurised with inert gas, nitrogen or a nitrogen/CO₂ blend. Over 3,500 US restaurants used the format in 2024. It cuts the carbon footprint by roughly 40 % compared to glass bottles and keeps wine fresh for 4-6 weeks once tapped.
Detailed answer
Wine on tap sounds trendy, but the concept is ancient, Romans served wine from pressurised vessels thousands of years ago. The modern version took off in California around 2010, led by companies like Free Flow Wines, which processed over 7 million litres in 2024 and supplied 3,500+ venues.
The setup uses stainless-steel kegs (10, 20, or 30 litres) purged with nitrogen to remove all oxygen. An inert gas, pure nitrogen for still wines, a 70/30 N₂/CO₂ mix for sparkling, pushes wine to the tap. The result: zero oxidation from first pour to last, unlike an open bottle that starts declining within 24-48 hours.
The environmental case is strong. A Portland State University study (2020) found that switching from glass bottles to kegs cuts the carbon footprint by 40 % per litre served. A single stainless-steel keg lasts 30+ years and can be refilled over 300 times, eliminating the 550 g of glass in each standard 75 cl bottle. A restaurant pouring 500 bottles a month saves 275 kg of glass waste.
Europe is catching up. The UK had roughly 800 tap-wine venues in 2024. Belgium is earlier in the curve, but forward-thinking wine bars, especially those focused on by-the-glass service, are exploring the format. A well-managed keg system wastes less than 2 % of wine, compared to 15-20 % from opened bottles in a by-the-glass programme.
The biggest hurdle? Perception. Many drinkers still link 'tap wine' with low quality. In reality, respected estates like Bonterra, Scribe Winery, and Jean-Luc Colombo now offer keg formats. The pitch for restaurants is freshness and sustainability, and the economics don't hurt either, with a 20-30 % reduction in cost per glass.
| Criteria | Glass bottle (75 cl) | Stainless-steel keg (20 L) | Bag-in-Box (3 L) |
|---|---|---|---|
| Carbon footprint / litre | Baseline (100 %) | −40 % | −55 % |
| Shelf life after opening | 24–48 h | 4–6 weeks | 4–6 weeks |
| Waste (by-the-glass service) | 15–20 % | < 2 % | 5–8 % |
| Container reusability | Recycling | 300+ refills (30 years) | Single use |
| Consumer quality perception | High | Improving | Medium |
| Cost per glass (restaurants) | Baseline | −20 to −30 % | −30 to −40 % |
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