Also known as circulation heaters, these install directly into pipelines to quickly and efficiently heat liquid through direct contact. To heat coolant without creating hot spots and damaging the heating element, they have a lower watt density than heaters for water or chemicals. An adjustable thermostat automatically turns the heater on when the temperature drops below the set temperature and off when it rises above the set temperature. Adjust the set temperature with the dial.

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Tackle high-temperature drying, shrink-wrapping, and plastic welding jobs with your everyday compressed air supply. These heaters connect to your air source on one end and to your process on the other. Control the output temperature by adjusting the incoming airflow or power sent to the heater. The outlet can point upwards, straight, or as much as 10° downwards. Be cautious when positioning it—pointing it further downwards may damage the heating element.

To calculate the wattage needed for your application, multiply your incoming airflow in CFM by the number of degrees you need to increase air temperature, then divide by three.

Thermocouple probes and thermocouple fittings (both sold separately) allow you to use a temperature controller to operate 240V AC heaters. The probe threads into the fitting to measure your air outlet temperature.

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These tubular heaters minimize the risk of sparks and fire from combustible particles in the flow stream, making them a safer choice than open coil heaters. Finned for increased surface area, they quickly dissipate heat in air and inert gas heating systems such as duct heaters and convection ovens. Their sheath, fins, and fittings are made of stainless steel, which resists heat and corrosion better than steel. These heaters require a temperature switch or control (sold separately) to regulate output.

Heaters with end fittings welded on one end have one fitting permanently welded for a secure connection, while the other fitting is loose to create room for tube expansion during heating. The extra space helps prevent damage.

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These heaters have a large surface area to quickly dissipate heat in air and inert gas heating systems used in ducts, ovens, and dryers. They have a 304 stainless steel heating element that resists corrosion and moisture. All heaters require a temperature switch or controller (sold separately) to regulate heat output.

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Also called tankless water heaters, these provide hot water on demand and take up less space than heaters with a tank. They are easier to install than gas tank heaters and don’t require a relief valve. All turn on when water flows through the heater and turn off when the flow stops.

Estimated yearly energy cost is based on electricity cost of $0.12 per kWh. For more information, visit www.ftc.gov/energy.

Heaters with an adjustable thermostat let you set the exact water temperature you need. Screws are inside the enclosure to prevent accidental movement.

Heaters without temperature control do not provide precise control. The temperature of the water coming out depends on the temperature of the water going in.

Heater for four faucets can be used with circular multistation wash fountains or a single shower.

Often used to recirculate hot water in process baths and sinks, these lightweight heater/recirculators boost water temperature on the go. An adjustable thermostat adjusts and maintains water temperature to within 0.25° F. For safety, these heater/recirculators should only be plugged into GFCI receptacles. The pump must be placed below the liquid source. Flow rate is not adjustable.

Estimated yearly energy cost is based on electricity cost of $0.12 per kWh. For more information, visit www.ftc.gov/energy.