Provided herein are systems and {HEAD ~ methods} directed to using {TAIL ~ renewable energy sources} with hot water heating systems 
directed to using
Provided herein are systems and { HEAD ~ methods } directed to using { TAIL ~ renewable energy sources } with hot water heating systems
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH