Panasonic has unveiled a new version of its Eco Cute CO2 heat pump that produces domestic hot water mostly during daytime based on solar radiation ... and multi-dwelling residential applications.

[Darrell]’s idea was simple enough. He hooked up solar panels to just the bottom heating element of his hot water heater. This cut his power bill in half. His calculator is now up at pvh20.com ...

Domestic hot water, with a heating system powered exclusively by DC solar power, has now covered the needs of an apartment building in Linz, Austria, for a period of a year. The 14 residential ...