Scientists at the University of Padova in Italy have built a residential heat pump prototype that utilizes an air-finned coil heat exchanger or photovoltaic-thermal (PVT) solar collectors as the ...

The tests showed that the box-channel propylene PVT collectors produce more heat per square meter compared to their conventional counterparts, while also showing a 34.4 % lower thermal production.

That’s enough output to easily heat a typical bedroom on a cold day. If this same circuit contained 35 feet of finned-tube, releasing an average of 425 Btuh per foot (assuming 170° average water ...