what is the best tankless water heater for an rv?
['Takagi Indoor Tankless Water Heater. ... ', 'GASLAND Tankless Water Heater. ... ', 'EcoSmart ECO 11 Electric Tankless Water Heater. ... ', 'Blackhorse-Racing 6L 12KW Portable Tankless Hot Water Heater. ... ', 'Suburban 5117A Water Heaters 6 Gallon. ... ', 'Marey Propane Gas Tankless Water Heater.']