If you want to combine a heat pump without an integrated cylinder with a solar system for hot water preparation, then the best solution is the new solar hot water cylinder for heat pumps,geoSTOR VIH RW 400B and VIH RW 300, because it stores the heat from the heat pump and the solar system in equal measure. If there is sufficient solar output in summer, the heat pump can even remain switched off; the solar system takes over hot water preparation by itself.
