In a preferred installation for the preheating of water to a hot water heater, the inlet second fluid will comprise cold tap water at line pressure and {HEAD ~ the thermosiphon loop} of {TAIL ~ circulating heat transport liquid} will normally be maintained at a positive static pressure of less than 10 psig  
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In a preferred installation for the preheating of water to a hot water heater , the inlet second fluid will comprise cold tap water at line pressure and { HEAD ~ the thermosiphon loop } of { TAIL ~ circulating heat transport liquid } will normally be maintained at a positive static pressure of less than 10 psig
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH