- A.O. Smith Water Products
 - Manufacturer of residential and commercial water heaters, hot water storage, and hydropneumatic storage tanks. - Aldrich Company
- Manufacturer of water heaters and boilers.
- American Standard Water Heater Corporation
- Manufactures of commercial, residential, caravan water heaters and commercial storage tanks.
- American Water Heater Company
- Manufacturer of energy-efficient gas and electric water heaters.
- Apricus Solar
- Produces solar water heaters for household, swimming pool, spa, and floor heating.
- Atmor Instant Water Heaters
- Manufectures electric instantous water heaters.
- Bradford White
- Manufactures water heating products.
 Gledhill Water Storage
- Manufacturers of copper cylinders and heating appliances. Suppliers to the trade only.- GSW Water Heating Company (1)
- John Wood Water Heating
- Manufacturer of storage type water heaters.
- PVI Industries Inc.
- Manufacturer of commercial, institutional, and industrial water heaters and boilers.
- Range
- Manufactures copper cylinders and combination units for hot and cold water storage.
- Raypak, Inc.
- Manufacturer of gas-fired commercial and residential hydronic heating boilers, and also water, swimming pool, and spa heaters.
- Rheem Manufacturing Company
- Manufacturers of water heaters, furnaces, air conditioners, swimming pool heaters, and boilers.
- Shimron Energy Ltd.
- Manufactures Clipair for multifunction drying and heating uses and Hoter, an instant water heater.
- Sioux Steam Cleaner Corporation
- Manufacturer of industrial pressure washers, steam cleaners, water heaters, and solution heaters for various applications.
- State Industries
- Takagi
- Manufacturer of tank less gas water heaters. Site includes product details, specification, installation manual, and application.
- Vaughn Manufacturing Corporation
- Offers residential and commercial water heaters, GFX graywater heat recovery system, and electric utility products and services.
- Venus
- Manufacturers of water heaters in India who export to Nepal, Bhutan, and Sri Lanka.
- Water Heater Innovations, Inc.
- Manufacturer of the Marathon water heater.
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