We got a heat pump installed at the start of the year. We did originally want a gas boosted solar system, but we are on bottle gas plus in a shady area. It is not doing to bad so far, but hard to tell about cost savings as we don't have past years in the house to compare. Our last elec bill was huge, but I was using our dryer a lot and the electric column heater. Have cut back on those, so we will see next bill how it goes. Have not run out of hot water at all since it has been installed.