Ignoring equipment cost, in many climates PV + a heat pump would outperform a plain solar water heater. :) [Silly to ignore equipment costs, sure, but if you h

Ignoring equipment cost, in many climates PV + a heat pump would outperform a plain solar water heater. :) [Silly to ignore equipment costs, sure, but if you have other uses for PV power ... using PV for heating water isn't necessarily nuts.]