Questions & Answers Which Is More Efficient: ASHP or Solar Diverter? A Comparative Calculator MarsApr 18, 202418 April 20240 Water Heating Efficiency Calculator – Heat Pump versus Solar Diverter/Immersion Water Heating Efficiency Calculator: Heat Pump versus Solar Diverter/Immersion Heat Pump COP: Hot Water Cylinder Volume (L): Desired Temperature Rise (°C): Calculate