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