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When talking about the size of a water heater for your business the physical size is just one factor. Water heater sizing also includes storage capacity and input. In other words, how many gallons of hot water does the tank store and how much power does the burner use to raise the temperature of that water? Here’s what you need to know to accurately size a water heater for a business.

Find the Right Combination

The first step is to find the right combination and identify your hot water requirements. For this, we recommend you contact an experienced commercial water heater professional. They’ll take various characteristics of your business operations into account to help you figure out what combination you need. These are including, but not limited to:

  • The Number of Fixtures (dishwashers, sinks, showers, pools, and more)
  • Hours of Operation (24/7, lunch hours only, etc.)
  • Peak Business Hours (higher demand times of hot water)
  • Geographic Location
  • Venting Restrictions or Requirements
  • Physical Footprint Limitations

Using these qualifiers, the professional can accurately calculate the type, necessary BTUs, gallons, and physical size water heater to ensure consistent hot water when you need it.

Count Fixtures to Accurately Size a Water Heater for a Business

Use this list to count fixtures to size a water heater for a business accurately. This list will help your water heater professional determine which commercial water heater set up and installation you’ll need to ensure you always have hot water.


  • Dishwasher sinks
  • Dishwashers (Rack-style or conveyor-style)
  • Prep Sinks
  • Bar Sinks
  • Average Cover Counts for Rush Hours
  • Scrub/Mop Sinks
  • Customer Restrooms
  • Other Hot Water Fixtures


  • Number of Guest Rooms
  • Regular Shower Heads
  • Restricted Flow Shower Heads
  • Hot Tubs
  • Pools
  • On-Site laundry Machines
  • Kitchen, Restaurant, Bar Facilities (see above)
  • Lobby Restrooms
  • Fitness Center
  • Other Hot Water Fixtures

Apartment Building

  • Max Tenant Capacity
  • Number of Bathrooms
  • Building Heating Method (Is there an existing boiler?)
  • Fitness Centers
  • Pools
  • Hot Tubs
  • Washing Machines
  • Other Hot Water Fixtures


  • Max Number of Customers Per Day
  • Number of Shampoo Sinks
  • Restrooms
  • Pedicure Baths
  • Other Hot Water Fixtures

Fitness Centers

  • Max Number Customers Per Day
  • Number of Showers
  • Steam Room
  • Pools
  • Hot Tubs
  • Other Hot Water Fixtures

Parts & Supplies

Once you’ve determined the commercial water heater, you need it’s time to order. We can help. Wallingford Sales is your trusted source for commercial plumbing and washroom equipment, parts and supplies.

We deliver the quality products you need to keep your facilities and construction projects running smoothly. Ordering is convenient and at wholesale prices. Shop Now! (866) 977-2537