Water Heater Sizing Calculator

Size tank or tankless water heaters based on demand.

Water Heater Type

Household Size

Number of Occupants

Number of Bathrooms

Hot Water Fixtures

Showers

Bathtubs

Kitchen Sinks

Dishwashers

Clothes Washers

Usage Level

Tank Size Guide

Household	Gas Tank	Electric Tank
1-2 people	30-40 gal	40-50 gal
2-3 people	40-50 gal	50-60 gal
3-4 people	50-60 gal	60-80 gal
5+ people	60-75 gal	80+ gal

Hot Water Usage

Fixture	GPM	Gallons/Use
Shower	2.0	10-15
Bath	4.0	15-25
Kitchen Sink	1.5	2-4
Dishwasher	1.5	6-10
Clothes Washer	2.0	20-30