Water Heater Calculator
Size a new water heater and estimate the installed cost, whether you want a traditional tank or a tankless unit.
A tank heater is sized by how many people use hot water, so it has enough stored for busy mornings. A tankless unit is sized instead by flow rate, how many fixtures might run at once, and how cold your incoming water is, since colder water needs a more powerful unit. Pick the type, answer a couple of questions, and get a recommended size and a cost range.
Estimate only. Sizing is a starting point; a plumber confirms first-hour rating or flow against your actual fixtures. Cost is installed and varies with venting, gas lines, and code upgrades.
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