I have tried Bosch, Takagi's, Noritz and Rinnai's. I like the Rinnais the best. My company has installed over 100 this year. Try to go with the LP unit. I have installed the electric, thank God the homeowner provided it, we charged them to pulled it out in less than two months. The most important thing for a tankless water heater is having the gas piping correctly sized. If I were a betting man Carcrazy's Rinnai's had the gas under sized. Even if you tell the Mechanical contractor what you need, they usually have it piped incorrectly the first time they are involved with one.
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