1) You might have a simple liming problem, requiring deliming by qualified service technician.
If you want to do-it-yourself, Utube search: de-lime tankless water heater
2) Usually the warranty requires yearly, and periodic maintenance like a new car:
Maintenance protocol requires yearly de-liming.
Tankless cannot be exposed to water exceeding 11 grains hardness, and require softener and filter.
3) Look up your manual on following link and read entire thing to shake off promotion-driven-perception that tankless solve all water heater worries:
http://www.boschhotwater.com/HelpfulResources/BrochuresManuals/tabid/354/Default.aspx4) The promise of 'longer-life than tank heater' is not supported by actual product warranty.
Check your manual for warranty.
5) Since all costs are energy, tankless can fall short of energy-saving claims.
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