Unit-OD consists of two lying upon another, single boilers with equivalent performance, collective electronic- and control unit.
During operation current changes of the switch on priority occur to ensure uniform operation time. In case of higher energy demand or to cover peaks a parallel operation of the both single-boilers is possible.
Even the charge control for an additional heat source (buffer charge, electrical return temperature increase) is adopted! Perfect cooperation –especially for systems with buffer storages – is guaranteed!
Dimensions: OD 3030, OD 4040