Bosch water heater frequently cycles on and off with small hot water draws (e.g., handwashing).

Safety first: No internal hazardous work is typically required, but always turn OFF power and gas before opening the unit.

• Increase flow: When possible, open hot water taps more fully to keep the heater running steadily during use.
• Adjust temperature: Lower the set temperature so less mixing with cold is needed, which can reduce cycling.
• Upgrade fixtures: Replace ultra-low-flow aerators with slightly higher-flow versions compatible with tankless heaters.
• Add buffer tank: Consider installing a small buffer tank or recirculation system to smooth out demand and reduce cycling.