The circulation system can be active, using pumps, or passive, relying on gravity or convection to move the water from one ...

Think of solar greenhouse heaters as a way to supplement existing heating systems. They're out there, but some assembly may ...

The Bionaire Silent Micathermic Heater is a good example. The manual states that it produces both convection and radiant heat. The Bionaire creates immediate warmth -- a nice, gentle kind of heat ...