Pressure Rated Flanged Immersion Heaters

Watt Densities for Typical Applications

8 watts/in2 (1.3 watts/cm2)

• Typical Applications: Fuel Oils (Bunker C and Number 6)
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Steel Sheath

15 watts/in2 (2.3 watts/cm2)

• Typical Applications: Fuel Oils (Number 4&5)
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Steel

16 watts/in2 (2.5 watts/cm2)

• Typical Applications: Heat Transfer Oils ● Liquid Paraffin
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Incoloy® 800 sheath

23 watts/in2 (3.6 watts/cm2) (A)

• Typical Applications: Lightweight Oils ● Heat Transfer Oils ● Degreasing Solutions
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Steel

23 watts/in2 (3.6 watts/cm2) (B)

• Typical Applications: Forced Air ● Caustic Solutions ● Degreasing Solutions
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Incoloy® 800 Sheath

48 watts/in2 (7.4 watts/cm2)

• Typical Applications: Process Water
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Incoloy® 800 Sheath

60 watts/in2 (9.3 watts/cm2) (A)

• Typical Applications: Deionized Water
• Recommended Flange: 150-lb Raised Face 316 Stainless Steel
• Elements: 316 Stainless Steel Sheath

60 watts/in2 (9.3 watts/cm2) (B)

• Typical Applications: Clean Water
• Recommended Flange: 150-lb Raised Face Forged Carbon Steel
• Elements: Copper Sheath

60 watts/in2 (9.3 watts/cm2) ©

• Typical Applications: Deionized Water
• Recommended Flange: 150-lb Raised Face 316 Stainless Steel
• Elements: 316 Stainless Steel Sheath

Sheath Materials

• Incoloy 840 - Nickel 18-20%, Chromium 18-22%, Iron balance.Has about 10% less nickel than Incoloy 800. Used in many air heating applications, where it has exhibited superior oxidation resistance at less cost than Incoloy 800.


• Incoloy 800 - Nickel 30-35%, Chromium 19-23%, Iron balance. The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating and immersion heating of potable water and other liquids.


• 316/316L Stainless Steel - Chromium 16-18%, Nickel 11-14%, Iron balance. (316L - Low Carbon) Modified with the addition of Molybdenum (2-3%) 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: 1200°F / 649°C


• 304/304L Stainless Steel - Chromium 18-20%, Nickel 8-11%, Iron balance. (304L - Low Carbon) Used in the food industry, medical, and chemical heating. Maximum Sheath Temperature: 1200°F (649°C)


• 321 Stainless Steel - Chromium 17-20%, Nickel 9-13%, Iron balance.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.


• Copper - Standard Copper Alloy. A low temperature, inexpensive material used mainly for clean water heating. Maximum Sheath Temperature: 350°F / 177°C


• Steel - Low Carbon. Used for high to low viscosity oils, asphalt, tar, wax, molten salt, heat transfer liquid media and other compatible solutions.


• Incoloy 825 - Nickel 38-46%, Chromium 19.5-23.5%, Molybdenum 2.5-3.5%, Iron balance

Flange Materials

• Incoloy 800 Flange 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 that are not corrosive to an Incoloy® 800 sheath.


• 304 SS Flange - A Chromium (18-20%), Nickel (8-11%), Iron Alloy used in the food industry, sterilizing solutions, air heating and many organic and inorganic chemicals.


• 304L SS Flange - A Chromium (18-20%), Nickel (8-11%), Low Carbon Iron Alloy used in the food industry, sterilizing solutions, air heating and many organic and inorganic chemicals.


• 316L SS Flange - A Chromium (16-18%), Nickel (11-14%), Low Carbon Iron Alloy with Molybdenum (2-3%) added to improve corrosion resistance in certain environments, especially those that would tend to cause pitting due to the presence of chlorides. Applications include deionized water.


• Steel Flange - 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.