Hot Water Boilers

A reliable source for Industrial Boiler information and leading Industrial Boiler Companies & Manufacturers.

Hot water boilers are an important part in hydronics, the use of water as a heat-transfer medium in heating and cooling systems, because they heat the water that circulates through a series of pipes and into radiators, baseboards and other heat exchangers. Read More…

Hot Water Boilers Hot water boilers are tanks or vessels that transfer thermal energy from a heat source to water that is then circulated to provide residential, commercial and industrial heating.

Leading Manufacturers

Schenectady, NY  |  518-344-7490

We strive for the best at Unilux Advanced Manufacturing LLC. Our boilers are designed with superior materials. We are proud to say that we produced the world's first UL/FE boiler and our units provide the highest levels of safety and accountability.

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Unilux Advanced Manufacturing, LLC $$$

Pulaski, NY  |  315-298-5121

As the inventor of the vertical tubeless boiler, Fulton has a reputation for success dating back to 1949. We`re a global manufacturer of steam, hot water and hydronic boilers, thermal fluid heaters, and custom engineered systems.

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Fulton $$$

Chattanooga, TN  |  855-753-2645

Since 1987, Industrial Boiler & Mechanical has been selling and offering superior service for new & rebuilt boilers: a wide variety of stock boilers including firetube boilers, watertube boilers, vertical boilers (tubeless), solid fuel boilers (wood, coal & bio-mass), electric boilers & boiler burners.

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Industrial Boiler & Mechanical Co. Inc. $$$

Fremont, CA  |  800-227-1966

Nationwide Boiler is a leading supplier of new and reconditioned boilers for industrial facilities worldwide. We’re a manufacturer’s representative and stocking distributor for B&W package watertube boilers and Superior package firetube boilers, and we have fully reconditioned boilers in a variety of types and sizes. With sales, service and equipment depots throughout the U.S., we strive to provide our customers with reliable equipment and superior service. Call today to learn more!

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Nationwide Boiler Inc. $$$

Greensboro, GA  |  706-453-2050

With over 50 years of knowledge in quality control, process piping, fabrication, pressure vessel installation, and ASME certified welding, we specialize in meeting the stringent quality and diverse fabrication needs of all our customers. B&S is qualified for a wide range of projects; from Chillers and Cooling Towers, to large Compressed Air Systems, to full Boiler Rooms; we have the expertise.

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BSP Boiler & Steam Performance $$$

Buena Park, CA  |  714-562-0196

As a top California boiler company, Manley’s Boiler provides boiler repair, maintenance, monitoring, boiler rental, and installation services. We work on any boiler brand, model, and size of commercial and industrial boiler for customers all across California. Manley’s Boiler is accredited with both “R” and “S” stamps, setting the standard for boiler maintenance and repairs nationwide.

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Manley's Boiler, LLC $$$
placeholder image Unilux Advanced Manufacturing, LLC Fulton Industrial Boiler & Mechanical Co. Inc. Nationwide Boiler Inc. BSP Boiler & Steam Performance Manley's Boiler, LLC

Hot water boilers are usually made from stainless steel, aluminum, cast iron or steel and are built to withstand high temperatures and pressure. A furnace along with heat exchangers and tubes is enclosed in a housing that provides a fireproof, well-ventilated, stable-air environment. Possible fuels include coal, wood or natural gas, though hot water boilers that run on electricity are also widely available. These appliances may be also be combi boilers, which do not have a hot water storage tank but instead draw in water as it is needed.

Unilux Hot Water Boiler Systems Hot Water Boiler Systems - Unilux Advanced Manufacturing, LLC

Depending on the application, commercial systems may add various substances to the water including chemicals to inhibit corrosion, prevent freezing, increase the boiling point of the water, improve leak detection and reduce bacteria and mold growth. They are used for commercial and industrial heating and circulation, tank heating, swimming pools, floor and baseboard residential heating and water source heat pumps.

There are two main ways boilers heat water: fire-tube or water-tube. Fire-tube boilers direct the heat produced from burning fuel through heat exchanging tubes that are immersed in water. Heat moves from high to low temperatures so the water around the tubes becomes hot. Water-tube boilers are different in that there is water inside the tubes that circulates as the tubes are heated from the outside. The hot water is then moved by one of three ways. Gravity flow heating systems are the oldest, simplest and least efficient technique. Water is circulated due to the thermal differences between hot and cold water; water expands as it is heated so it travels through the pipes and displaces the cooler water.

A pumped water system uses the same principles as gravity flow but is aided by use of a pump that circulates the water faster to produce a more controllable room temperature. Baseboard heating also relies on radiant heat, the heat that is released from hot pipes in the system. The main difference is that radiators are replaced with enclosed metal fins installed in the baseboards to distribute warm air at floor level. As the hot air rises it displaces cooler air and warms the room.

Hot Water Boilers Informational Video