KXS-KXD are the most suitable solution for usage with heat pumps
and the standard heating sources (solar collector, boilers). They are
designed for systems in which high efficiency is the top requirement. The
differentiation features of maxi water heaters are the length and number of
serpentines. In the same volume there is an inner and an outer serpentine
with larger surface area. The serpentines are evenly spread from top to
bottom allowing for a homogeneous heat distribution and preventing the
appearance of cold areas suitable for bacterial growth.