I've been using the #4 for a few months with no problems. It is not as strong as other prop pumps, but dose not cost as much as the others I looked at. After looking at the power consumption I would say this is my new pump for hurricane season. Only 1w per 100 gph. I also talked to Valerio Bresolin president/owner and he said they should be comming out with 2 bigger sizes. He dose not recomend you use them with a wave maker if you don't want to hear some noise, but he hopes to have a wavemaker set up by the end of the year.