A high-quality tankless water heater can theoretically run continuously for hours without stopping, provided there is an uninterrupted supply of clean water, proper gas flow, and unblocked electrical power. Unlike traditional storage tank water heaters that quickly deplete their finite pool of stored hot water within twenty to forty minutes, tankless systems heat water on demand as it flows through the heat exchanger. However, running the unit continuously at maximum capacity places heavy thermal stress on the components, meaning modern units feature built-in safety controls and flow-rate limits to protect internal parts from overheating during prolonged, heavy household usage.
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