$57.97 to $121.97 (5 offers) - Buy Navien 20026535F Manual Npe Tankless Water Heater 884954033419 . Mpn: 20026535f . Upc: 884954033419 . Type: Tankless Jan 16, 2008 · Propane has a heating content of 92,000 BTU/gallon, so, the 18 MBTU equates to 197 gallons of extra propane per year. In our area, this is $394 worth of propane per year. Over the 8 years we have been in this house, this is $3150 worth of propane!
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