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Due to a foundation retrofit, I had to relocate 8 rickety aging 30 gallon water tank style heaters in my 4 story apartment building. The last time I changed them out, I got some bad Rheems with thermocouples that needed changing all the time. Major manufacture malfunction. I decided to move my...

The fact is, that Takagi units work very well. There are two problems. One, tankless hot water heaters as boilers--just not as efficient as a real boiler because, as others have said, it is designed to take cold water from 50 to 120 degrees, not 120 degree water to 140. Boilers do that better...