I believe that Flame king and similar manufacturers built these tankless hot water heaters for the camper or mobile traveler. The handheld shower that comes with it along with a standard garden hose are probably good enough once the way that the unit mounts has been decided. The temperature of the water can be adjusted using one of the controls on the front.In this case, the goal was to provide seasonal hot water to a wash rack for use on a horse or maybe do some cleanup work that requires warm water. The unit is installed in an area that is prone to freezing temperatures; in any case the unit would need to have the ability to withstand the cold. As seen in the video, the tankless hot water is mounted on a board on the wall of the barn. Once everything was hooked up, the unit performed well enough. When I originally tested the unit, it produced hot water at about 110 degrees or so. After I had the tankless water heater permanently mounted, 99 degrees seems to be its warmest temperature.In the complaint department, I have two big ones:First, the installation manual (pamphlet?) is very limited. One of the things that the manual seemed to gloss over was some of the hook up information. Specifically the drain plug mechanism. When I turned on the water supply initially, there was water coming from a place that was unidentified in the owner's pamphlet. I tried to go on line and get to customer support but that seemed to be an opaque and mysterious. Amazon helped facilitate by getting me the number. However the number went to an answering machine. I eventually got a call back from Flame King, but apparently it went to voicemail and I did not talk to them. In the mean time, I discovered that this "leak" was coming from a what I suspect is the drain plug. Again, the manual did not identify what "the thing" was. After looking up this thing, I could see that there was a place for a flat blade screwdriver that can tighten to shut the water off.Second, since this is a Chinese made unit, the input and output water connections use British Standard Threads (BST) and not National Pipe Threads (NPT) for the water hook ups. Flame King provided a BST to Garden Hose Thread (GHT) adapter that I could see working for the campers but not for me. I had to buy adapters (thank you Amazon) to eventually make the connection to the pex pipe water supply. Again, it would have been helpful to have had enough information in the booklet to help me when going out to get the attaching hardware.I like the fact that the gas only comes on when there is water flowing though. The gas regulator comes with the unit and all that is needed is your own LP tank.[6 months later] Through a lack of speedy action on my part, I did not drain the unit prior it freezing, which caused a leak when I went to test it. The picture you see is of the gas inlet. When I was disconnecting the plumbing to take it off of its mount, the pipe that deals with the gas broke as you see. I think that I could have fixed the leak (I suspect that a seal failed) but I don't think that I can fix this. Keep in mind, other that the branding on the front of the unit and a serial number, there is no manufacturers plate and no means to contact the supplier to investigate repair parts. I would suspect that there is a warranty but if I thought there was a problem, I would have no easy way to reach out to the manufacturer. I have made a decision to buy another unit from another manufacturer with the hopes that I will be more successful. Having said that, it still did a decent job of creating hot water.