Is Solartwin’s PV (photovoltaic) pumping a gimmick?
No, for the above reason. Solar PV pumping makes Solartwin is around 20% more sustainable than old solar technology based on this side by side test report. Solartwin is a Zero Carbon solar panel water heating system. Most others are merely low carbon technology in that your electricity bill tends to go up with a solar panel which is used to replace gas or oil as a fuel with a consequent rise in global warming gases being produced. Hence why Solartwin is about 20% more sustainable.