Syngas vs Water Gas: Key Differences, Uses & Production Costs
Syngas is a generic mixture of carbon monoxide and hydrogen, produced from any carbon source; Water Gas is a specific syngas made by passing steam over hot coke, with a fixed CO:H₂≈1:1 ratio.
People conflate them because “water gas” sounds like the only gas that ever met water, yet refineries, fertilizer plants, and even bio-diesel startups all just say they “run on syngas,” blurring the brand line in everyday chatter.
Key Differences
Syngas feedstocks vary—coal, biomass, plastic waste—yielding adjustable CO/H₂ ratios. Water Gas is locked to coke and steam, giving a constant ratio plus trace CO₂. Syngas plants cost $1–3 per GJ; Water Gas, needing coke ovens, runs $5–7.
Which One Should You Choose?
Need flexible ratios for methanol or SAF? Pick syngas. Retrofitting an old steel-town coke oven for ammonia? Water Gas fits. Otherwise, modern ATR or gasifiers beat both on CAPEX and carbon intensity.
Examples and Daily Life
Your city bus running on green-diesel used syngas from household waste. A vintage 1940s gasifier motorcycle, however, literally filled its balloon tires with Water Gas during wartime fuel rations.
Is Water Gas still manufactured today?
Only in legacy coke-oven complexes; most have switched to natural-gas-based syngas.
Can syngas be carbon-negative?
Yes, when sourced from biomass paired with CO₂ capture, it removes more CO₂ than it emits.
Which is cheaper per km for vehicles?
Syngas-derived compressed hydrogen currently wins on cost and infrastructure availability.