As it is the case with heat pumps, the seasonal performance factor (SPF) describes the ratio heat generation to electricity demand (without household electricity consumer). However, while a heat pump additionally receives energy from the environment, the energy for my-PV products comes from the sun. The big advantage is that electricity is now available instead of heat for energy distribution. "Cables instead of pipes" make the system much easier and less expensive. A fact that also has a significant impact on maintenance costs.