Technical Data - Typical Watt Densities
1.Watt density is determined by dividing the heater
wattage by the total surface area of all heated surfaces
on the element. Remember that electric heating
elements will continue to increase their surface
temperature until all heat produced by the element is
transferred to the work.
2.Typical watt densities shown in the table below are
based on non-circulated liquids unless noted otherwise.
Material Being Heated
Acetaldehyde
Acetone
Acetic
Boric
Carbonic
Chromic
Citric
Fatty Acids
Acid Solutions Lactic
Malic
(Mild)
Nitric
Phenol - 2-4 Disulfonic
Phosphoric
Phosphoric (Aerated)
Proponic
Tannic
Alkaline Solutions
Aluminum Acetate
Aluminum Potassium Sulfate
Ammonium Acetate
Amyl Acetate
Amyl Alcohol
Aniline
Asphalt
Barium Hydroxide
Benzene, Liquid
Butyl Acetate
Calcium Bisulfate
Calcium Chloride
Carbon Monoxide
Carbon Tetrachloride
2%
Caustic Soda 10%
75%
Citrus Juices
Degreasing Solution
Dextrose
1 ft. sec. or more
Dowtherm A
non-flowing
Dowtherm E
Dyes & Pigments
Cadmium
Electroplating Copper
Dilute Cyanide
Baths
Sodium Cyanide
Potassium Cyanide
Ethylene Glycol
Formaldehyde
Freon Gas
Grades 1 & 2 (distilate)
Fuel Oils
Grades 4 & 5 (residual)
Typical Watt Densities
D50
Caloritech™
Max.
Watts/
sq. in
14
14
40
40
40
40
25
25
10
14
25
40
28
26
40
30/40
44
14
40
28
28
24
26
4-10
40
14
14
20
5-8
25
25
50
28
26
26
25
25
23
10
12-18
23
40
40
40
40
40
30
12
2-5
23
14
Operating
Temperature
°C
°F
82
180
54
130
82
180
125
257
82
180
82
180
82
180
66
150
50
122
49
120
75
167
82
180
82
180
82
180
82
180
71/82 160/180
100
212
50
122
100
212
75
167
116
240
100
212
177
350
93-260 200-500
100
212
66
150
107
225
204
400
93
200
—
—
71
160
99
210
99
210
82
180
85
185
135
275
100
212
399
750
399
750
204
400
100
212
82
180
82
180
82
180
82
180
82
180
149
300
82
180
149
300
93
200
93
200
3.Use of watt density lower than listed will prolong heater
service life.
4.This data is for use as a general guideline only. System
conditions may exist that may mandate densities
lower or higher than listed. Certain substances of high
viscosity and low heat transfer may be subject to coking
if density is too high.
Material Being Heated
Grades 6 & bunker C
Fuel Oils
(residual)
Gasoline
Liquid
Gelatin
Solid
Glycerine
Glycerol
Liquid
Grease
Solid
Heat Transfer
Oils
Static
Circulating
Hydrazine
Linseed Oil
SAE 10
SAE 20
Lubrication Oil SAE 30
SAE 40
SAE 50
Magnesium Chloride
Magnesium Sulfate
Manganese Sulfate
Methylamine
Methylchloride
Mineral Oil
Molasses
Molten Salt Bath
Naptha
Oil Draw Bath
Paraffin or Wax (liquid state)
Perchloroethylene
Potassium Chlorate
Potassium Chloride
Potassium Hydroxide
Soap, Liquid
Sodium Acetate
Sodium Cyanide
Sodium Hydride
Sodim Hydroxide
Sodium Phosphate
Sulfur, Molten
Therminols
Toluene
Trichlorethylene
Turpentine
Vegetable Oil & Shortening
Water (Process)
Max.
Watts/
sq. in
8
25
25
6
10
26
26
5
18
14
24
22
18
50
26
24
23
16
14
40
40
40
22
20
25
18
5
25-30
12
25
20
25
40
40
23
24
45
45
30
40
10
26
23
15
25
25
22
40
60-90
Operating
Temperature
°C
°F
71
160
149
300
66
150
66
150
260
500
100
212
—
—
—
—
260
500
316
600
260
500
316
600
100
212
66
150
121
250
121
250
121
250
121
250
121
250
100
212
100
212
100
212
82
180
82
180
93
200
204
400
100
100
427-482 800-900
100
212
316
600
66
150
93
200
100
212
100
212
71
160
100
212
100
212
60
140
382
720
100
316
260
316
343
100
66
149
204
100
212
600
500
600
650
212
150
300
400
212
Technical Data