Solar space heating is tricky. Air is harder to keep warm than water, and while most of us need a shower on a hot day—we tend to want space heating when the sun is not doing enough for us.

Alex Davies is a technology journalist and the author of "Driven," an upcoming book about the self-driving car industry. Well it's that time of the year again here in Southern California time to fill ...

Heat from the solar collectors is distributed through a radiant floor heating system using PEX tubing running through aluminium heat spreader plates. A hot water baseboard heating system is another ...