We use a large machine and can go from 100psi to 350psi or a bit higher if needed. My last one lasted 5 years before I bought another. It ranges from 2 gallons a minute to 10 depending on the settings. The money and time this thing saves me over a shurflo or similar is worth the extra money to me. I can completely cover a two story 2500sqft house in 10 -15 minutes.