Semantics aside, I have tried my luck with the so called "on demand" tanks. The first one, a Cinza, had a pilot light and a small tank that provided a "start up" flow if hot water. It used a fair bit of propane because the pilot was always on, but otherwise was quite efficient. The problem was that the flow of hot water was sometimes eratic ..... hot, cold, hot. The ignition crapped out in 2 years.
Next I bought a Bosch at Home Depot. Good German technology, right? Wrong! Don't buy one. I paid over $300 for mine, which required a pressure tank to run it. For over $400 you can get one to run on low pressure systems. This unit was tankless (no rusted out tank) and no pilot light ( no pilot light to burn excessive fuel). What a concept?
Problem was it produced no hot water unless you ran the hot water tap at full throttle. Biggest problem, though, was that the whole burner/ ignition unit packed it in after 4 months use. It was under warranty, however, and Bosch sent somebody to fix it after 2 months of phone calls to them. In the meantime, I bought another heater. Oh, and they replaced the parts for free but charged me 800 pesos service call.
The repaired unit lasted two months. It now hangs on the wall, looking brand new, but inoperable. Meantime my 150 dollar Mexican tank produces good hot water day after day after day.
I bought my new heater from Cheli, by the way. Why support Home Depot and the crap rhey sell?
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