Water heaters: Size & Dimension Guide

A survey of 1,306 ENERGY STAR water heaters reveals significant variation in capacity and dimensions. Capacity ranges from approximately 0.0 to 120.0 gallons, with a median of 46.0 gallons. Width measurements span from roughly 0.0 to 30.0 inches. The appropriate size for any given installation depends on household needs and the physical constraints of the available space, rather than defaulting to the largest available model.

The surveyed water heaters fall into six main categories. Hybrid and electric heat pump models comprise the largest segment at 680 units, followed by gas tankless units at 432. Gas-fired storage residential-duty commercial models account for 71 units, standard gas storage models for 68, and solar units with electric backup for 30. Each subtype occupies a distinct range of dimensions and performance characteristics.

Before purchasing a water heater, installers and homeowners should measure the height, width, and depth of the intended installation space. The path through which the appliance must be moved during installation should also be measured and assessed for clearance. The ranges documented in this dataset represent the outer bounds of current ENERGY STAR models and should not be interpreted as a fit guarantee for any individual unit. Verification of compatibility with a specific model requires direct comparison of that model's specifications against the measured dimensions of the installation space.

Measure twice

Capacity tells you how much it holds; the width, height and depth tell you whether it fits. Check both the appliance opening and the doorway/hallway path before you commit to a size.

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