: A microprocessor triggers a gas burner or electric element to heat a copper heat exchanger.
On-demand water heaters eliminate standby energy loss by heating water only as it flows through the unit.
: High-efficiency units produce acidic condensate that requires a dedicated drain line and neutralizer.
Tankless or Demand-Type Water Heaters - Department of Energy
: Preferred by professionals for high efficiency and easier venting options. V. Key Installation Hurdles
This paper explores the transition from traditional storage tanks to on-demand (tankless) hot water systems, evaluating technical requirements, fuel types, and economic trade-offs for modern homeowners. I. System Overview & Mechanism
: High-BTU gas units often require up-sizing existing gas lines to 3/4-inch or larger.
: Highly rated for "bang for the buck" in smaller households or point-of-use needs.
