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My parents are still on their first tankless heater installed in 1973.
Natural gas, no fan, pilot light, modulated output (so the temperature will adjust regardless of the input watertemp), I think it's some Bosch knock-off.
Seals replaced probably three times, water jacket (dunno what's an English name for it) replaced once.
I'm not sure if the current generation will last that long - for the house me & my brother are finishing for my parents we've got a current model Bosch natural gas with piezoelectric ignition (2 D batteries last about 18 months).
sailor
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