How do I repair a Bosch tankless water heater NG?
hot and cold water
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Call a service person who repairs Bosch products.
If it is leaking or not producing hot water it is probably time to replace. Look here for common problems and solutions for water heater repairs. www.thespruce.com
Try flushing it with vinegar. This should be done at least once a year to clean out mineral buildup in the heater.
How old is it? and how is it not working properly?