Currently, the two main technologies to transfer heat to a hot water storage tank, is by the use of one or several coils or an inlet with a rigid pipe with openings attached. However, none of these two technologies are able to heat a tank in an optimal energy efficient way.

The operation of the coil and the rigid pipe with openings are compared to our patented solution, StratiFlex™, in the table below, and explained individually at the following pages:

  Level of stratification Cost Installation
Coil solution Low Medium Medium
Rigid pipe with openings Low Low Medium
StratiFlex™ Superior Medium Easy


As it can be seen from the comparison table above, superior thermal stratification can only be achieved using StratiFlex™. Due to its high energy efficiency, StratiFlex™ is also the most cost competitive solution.