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 the thermosiphon loop of circulating heat transport liquid will normally be maintained at {HEAD ~ a positive static pressure} of {TAIL ~ 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 the thermosiphon loop of circulating heat transport liquid will normally be maintained at { HEAD ~ a positive static pressure } of { TAIL ~ less than 10 psig }
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