ON/OFF: a single operating mode, alternating phases at 100% of the capacity of the heat pump with stop phases. More energy intensive.
FULL INVERTER: technology which makes it possible to adapt the speed of rotation of the compressor and the fan to the heating needs of the pool and to the climatic conditions. Quieter and more reliable, the equipment is less required and allow energy savings.
Vertical: depending on the space available around the pool, a vertical rather than horizontal heat pump is better.