Whole-house electric tankless water heaters typically cause a noticeable increase in your monthly electricity bill if you are transitioning from a traditional storage tank, because they demand massive electrical amperage during operation—often ranging from 120 to 180 amps across multiple heavy-duty circuits. However, because they heat water strictly on demand rather than maintaining a standby reservoir of hot water around the clock, the net energy consumption is often more balanced than expected. For gas tankless units, the electrical impact is negligible, consuming only minimal power for digital controls and internal igniters while shifting energy use to natural gas.
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