Bosch Combi Boiler & Hot water heater

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cbejar

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9 year old Bosch Combi Tankless Boiler hot water temperature surges too high. How is the temp regulated? Is there a part I can replace to keep the hot water temp steady at the 120 setting? Hot water Heat is working OK.
 

GReynolds929

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When was it descale last? Scale build up in the heat exchanger can cause lots of different issues.
 
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