*PLUMBERSSTOCK EXPERT* responded:
Hello! Thank you for your interest in our Little Giant 513381 OS3-10E-1 oil sensing sump system. According to Little Giant, they don't have a prepackaged OS system with 1HP but they could put one together. However, it will be 230V because they don't have a 115V 1HP pump. If you're interested in purchasing the Little Giant 513381, just click "Add to Cart", enter your zip code and you're all set. Thank you for visiting PlumbersStock.com. Have a great day!