Compact unit. Runs off of 230v. It worked when I purchased the boat then I removed it to have it serviced at Electic on St. Maarten. After I reinstalled it the unit didn't come back on. I've replaced it with a 1000 gpd unit and want to sell this one. It has a remote controller also. I have photo's. There may be nothing wrong, may be serious. I don't know.