My machine is 2.7 gpm. I know it's not a commercial machine, but it's working for me for now. I tried a 100 ft pressure hose to see if it would work ok. With the water on, I engaged trigger to get water going through. When i started PW, it ran a bit rough, then stalled. i cleaned the air filter and that didn't help. I found that if I engaged the trigger, then machine ran fine. I let the water run a bit longer, then everything seemed fine. I know that water wasn't hot. The good news is that it worked fine after a few minutes. I'm just concerned it might happen again, or is a hint of something bad coming. Thanks.