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Water heater
A water heater is the appliance that heats and stores hot water for showers, sinks, and appliances.
Why it matters
Water heating is one of the largest energy uses in a home. Efficiency, size, and maintenance affect costs and reliability.
Where people get this wrong
Tank water heaters store hot water. Tankless water heaters heat on demand. Each has trade-offs for cost, output, and installation.
Real-world example
The shower runs out of hot water when two people shower back to back. The tank may be too small for the household's demand.
Where this hits your build
This comes up during rough-in and final fixture installation. Accessibility for future repairs matters as much as the initial install.
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