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Straight Tubular Heaters

Product Overview

Tubular heaters can be formed into virtually any shape, brazed or welded to any metal surface, and cast into metals. The tubular heater's basic construction consists of a computer-designed helical coil of 80% Nickel 20% Chromium alloy resistance wire fusion welded to the nickel-coated steel terminal cold pins.

Standard Sheath Materials

The selection of a sheath material should be made based on the the chemical composition of the solution being heated, character of materials entering the solution, and the processes controls. The following are the most common tubular element sheath materials. For other materials consult Proheat.

Note: Maximum sheath temperatures refer to the maximum temperature of the element sheath material. Consideration must be given to maximum temperature and watt density the heated material can safely see.


Incoloy® 800 A Nickel (30-35%), Chromium (19-23%), Iron Alloy. The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating (also see Incoloy® 840) and immersion heating of potable water and other liquids. Maximum sheath temperature is 1600°F (872°C).	316 Stainless Steel A Chromium (16-18%), Nickel (11-14%), Iron Alloy with Molybdenum (2-3%) added to improve corrosion resistance in certain environments, especially those which would tend to cause pitting due to the presence of chlorides. Applications include deionized water. Maximum sheath temperature is 1200°F (649°C).
Incoloy® 840 A Nickel (18-20%), Chromium (18-22%), Iron Alloy having about 10% less nickel than Incoloy 800. Used in many air heating applications where it has exhibited superior oxidation resistance at less cost. Maximum sheath temperature is 1600°F (872°C).	Copper Mainly used in clean water heating for washrooms, showers, rinse tanks and freeze protection of storage tanks. Maximum sheath temperature is 350°F (177°C).
304 Stainless Steel A Chromium (18-20%), Nickel (8-11%), Iron Alloy used in the food industry, sterilizing solutions, and many organic and inorganic chemicals. Maximum sheath temperature is 1200°F (649°C).	Low Carbon Steel Applications include fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, molten salt, and other solutions not corrosive to a steel sheath. Maximum sheath temperature is 750°F (399°C).
321 Stainless Steel A Chromium (17-20%), Nickel (9-13%), Iron Alloy modified with the addition of titanium to prevent carbide precipitation and resulting intergranular corrosion that can take place in certain mediums when operating in the 800-1200°F (427-649°C) temperature range. Maximum sheath temperature is 1200°F (649°C).

Electrical Limitations and Minimum/Maximum Sheath Lengths

Element Diameter		Maximum Voltage	Maximum Amperage	Resistance in Ohms per Heated Inch		Sheath Length

						Min		Max
in	Mm			min	max	in	mm	in	mm
0.26	6.6	250	15	0.1	17	11	279	200	5080
0.315	8.0	480	30	0.06	21	11	279	200	5080
0.375	9.5	480	30	0.04	21	11	279	230	5842
0.43	10.9	600	40	0.04	21	11	279	268	6807
0.475	12	600	40	0.04	21	11	279	275	6985
0.625	15.9	600	40	0.04	17	11	279	255	6475

Sheath and Heated Length Tolerance (Applicable for All Diameters)

Length		Sheath Length Tolerance		Heated Length Tolerance		Minimum Unheated Length Each End

in	mm	in	mm	in	mm	in	mm
11-20	279-508	±3/32	2	±1/4	6	1	25
21-50	509-1270	±1/8	3	±1/2	13	1-1/4	32
51-80	1271-2032	±5/32	4	±7/8	22	1-1/2	38
81-110	2033-2794	±3/16	5	±1-1/8	29	1-5/8	42
111-140	2795-3556	±7/32	6	±1-3/8	35	1-3/4	44
141-170	3557-4318	±1/4	6	±1-5/8	41	2	51
171-200	4319-5080	±3/8	10	±1-7/8	48	2-1/4	57
201-UP	5081-up	±1/2	13	±2-3/8	60	2-1/2	64

Mounting Methods

Type MC- Mounting Collar

Plated steel mounting collars are locked in place with a set-screw and serve as an adjustable stop for through the wall mounting. Collars are shipped in bulk unless otherwise specified.

Element Diameter		"A"		"B"

in	mm	in	mm	in	mm
0.26	6.6	5/16	7.1	5/8	15.9
0.315	8.0	3/8	8.7	3/4	19
0.375	9.5	7/16	11.1	7/8	22.2
0.43	10.9	7/16	11.1	7/8	22.2
0.475	12	7/16	11.1	1	25.4

Type LR --Locator Ring

Locator rings are permanently attached to the heater sheath and are used to limit the movement of the heater while allowing for expansion and contraction of the heater sheath. When ordering specify location from end of sheath.

Type MF --Mounting Bracket

The 16 gauge Stainless Steel Mounting bracket is an economical way to mount the heater in non-pressurized, non liquid applications. Unless otherwise specified the bracket will be located 1/2" (13 mm) from the edge of the heater sheath. Custom brackets of any size, thickness and material can also be supplied to meet your requirements.

Type B --Watertight Bulkhead Fittings

Bulkhead fittings provide a leak-proof method for mounting tubular heating elements through tank walls. A gasket, plated steel washer and brass hex jam nuts are included. Specify if a stainless steel washer and jam nut are required when ordering stainless steel fittings.

Standard mounting location is the threaded end of the bulkhead flush with the end of the element sheath. For other mounting locations specify distance from end of sheath to gasket surface on bulkhead.

Fittings are silver brazed or TIG welded to the element, depending on fitting material and customer application.

Fittings in table are the most commonly used. Special fittings can be manufactured to meet your requirements.

Specify: material, flange type, thread type and length.

Tubular Diameter		Fitting Material	Flange Type	"A"		"B"		"C"		Thread Size (UNF)

in	mm			in	mm	in	mm	in	mm
0.26	6.6	Brass	Round	3/4	19	1/2	12.7	5/8	16	1/2-20
0.26	6.6	Stn. Stl.	Round	3/4	19	1/2	12.7	5/8	16	1/2-20
0.315	8.0	Brass	Round	3/4	19	1/2	12.7	5/8	16	1/2-20
0.315	8.0	Stn. Stl.	Round	3/4	19	1/2	12.7	5/8	16	1/2-20
0.375	9.5	Brass	Round	3/4	19	1/2	12.7	5/8	16	1/2-20
0.375	9.5	Stn. Stl.	Round	3/4	19	1/2	12.7	5/8	16	1¼2-20
0.43	10.9	Brass	Round or Hex	7/8	22	3/4	19	7/8	22	5/8-18
0.43	10.9	Stn. Stl.	Round or Hex	7/8	22	3/4	19	7/8	22	5/8-18
0.43	10.9	Steel	Round	7/8	22	3/4	19	7/8	22	5/8-18
0.475	12.1	Brass	Round	7/8	22	3/4	19	7/8	22	5/8-18
0.475	12.1	Stn. Stl.	Round	7/8	22	3/4	19	7/8	22	5/8-18
0.475	12.1	Steel	Round	7/8	22	3/4	19	7/8	22	5/8-18
0.475	12.1	Brass	Round	1	25	3/4	19	7/8	22	3/4-16
0.475	12.1	Stn. Stl.	Round	1	25	3/4	19	7/8	22	3/4-16
0.625	15.9	Stn. Stl.	Round	1-1/8	32	3/4	19	1	25	7/8-14

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Straight Tubular Heaters

Product Overview

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Standard Sheath Materials

Electrical Limitations and Minimum/Maximum Sheath Lengths

Sheath and Heated Length Tolerance (Applicable for All Diameters)

Mounting Methods

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