Preferably, the housing 22 is sized sufficiently large to provide intermediate demand capacity for {TAIL ~ the system} equal to {HEAD ~ the hot water heater capacity} 
Preferably , the housing 22 is sized sufficiently large to provide intermediate demand capacity for { TAIL ~ the system } equal to { HEAD ~ the hot water heater capacity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD