This thing is a game changer, granted I do plumbing work as a job so to me it was super simple. It’s as easy as unhook your line and connect all the 3 parts together and screw the toilet seat ontop. Now one huge con, there is no temperature controle but most people don’t have hot water going to the toilet anyways, so if you wanted it not the incoming water temperature then you’d need to run a line from your hot water and buy a mixing valve to have the water coming in temperature controlled wich then you’d want to supply only that water to the unit and keep your normal cold line to the toilet. I myself don’t mind the cold water you get used to it after a few times.