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Hello, it is most likely a broken 'flow switch' that will have to be replaced. 98% chance of that.
Its a $400 or $500 job. The normal life span of those water heaters is in the 10 to 12 year range.
If the water heater is over 9 years old, it will most likely be a good idea to replace it. However
this diagnosis will have to be confirmed by a technician on site.
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Hello again, there is very little other than scrap value for any older tankless hot water heater. The copper is worth about $10.
If you choose one of the least expensive tank type water heaters with no vent damper and a standing pilot light, it will last 15 to 20 years as a rule with little or no repairs required.
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