KM SOLAR U-Tube Heat pipe Solar Collectors are smaller and more compact than common Heat Pipe Evacuated Tube Solar Collectors. While the two collectors have nearly identical efficiency ratings, there are several key advantages to U-tube Evacuated Tube Solar Collectors. These Include:

• Extremely Low Price                                                                 
• Additional Installation Versatility
• Compact Size for Tight Installation Locations

KM SOLAR U-tube Solar Collectors cost less than common Heat Pipe Evacuated Tube Solar Collectors, which are already one of the industry’s most affordable lines of solar collectors.
The main point here is that U-Pipe Collectors can be installed perfectly vertical or horizontal, allowing for a wider variety of installation options, which allow these solar collectors to be used where other collectors can not be used, such as on the top of a flat roof building where tilt mounting is not an option due to space limitations,  as an overhang from buildings where there is no roof space to mount the solar collectors, or flush vertically on a wall.

It is clear from the results that the conversion efficiency of Heat Pipe Evacuated Tube Solar Collectors is better than that of U-Tube Evacuated Tube Solar Collectors.
However, in pure dollar value – BTU/h/$ invested –U-tube Solar Evacuated Tube Solar Collectors deliver a higher energy value because of their extremely low price and high performance ratings.
In particular, U-Pipe Solar Collectors are the perfect for installations where the Solar Collectors will be mounted flush (flat) on a zero-pitch (flat) roof, or in a vertical orientation on the side wall of a building.