I am so glad that I can take a shower now without the water turning cold halfway through. I always trust Vevor as a company to produce great products. I have several different types of things from them and this is no different. I don't know about installation, my husband installed it and he seemed to do it all right. His dad's an electrician and he's a plumber so it's not like he didn't know what to do at all. It may be took him a couple hours. All I can say is I know that it's working well and I have no complaints