Heater Catalog - Watlow

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Air HeatersDuct HeatersMDH SERIESVelocity vs. Process TemperatureModular Duct Heater – Velocity vs. Process Temperature1600150014001300120040 W/in2 30 W/in2 26 W/in2 23 W/in2 18 W/in2Velocity – Feet/Min110010009008007006005004008 W/in230020010000100 200 300 400 500 600 700 800 900 1000 1100 1200Process Temperature (°F)Based on 70°F InletAir TemperatureWatt Density vs. Sheath TemperatureModular Duct Heater – Watt Density vs. Sheath Temperature501550 FPM 1200 FPM 760 FPM 600 FPM40Watt Density-W/in 23020300 FPM60 FPMNaturalConvection100100200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400Sheath Temperature (°F)406WATLOW ®
Air HeatersDuct HeatersMDH SERIESDTyp.3 1 /2 in.Typ.A®®B11 5 /8 in.8 in.10 1 /2 in.C21 3 /4 in.12 in.1/4 in.26 1 /16 in.3/8 in.DiameterApplication: Air Heating – Maximum outlet temperature – 750°F (399°C)Watt Est. DimensionsDensity No. of No. of Shipping Wt. Part in.W/in 2 kW Volts Phase Circuits Modules lbs Del. Number A B C D26 6 240 1 1 1 35 M MDH6Sl0 6.50 2.50 5.75 2.5026 6 240 3 1 1 35 M MDH6S3 6.50 2.50 5.75 2.5026 6 480 1 1 1 35 M MDH6S11 6.50 2.50 5.75 2.5026 6 480 3 1 1 35 M MDH6S5 6.50 2.50 5.75 2.5026 12 240 1 2 2 39 M MDH12Sl0 8.50 4.75 7.75 3.5026 12 240 3 1 2 39 M MDH12S3 8.50 4.75 7.75 3.5026 12 480 1 1 2 39 M MDH12S11 8.50 4.75 7.75 3.5026 12 480 3 1 2 39 M MDH12S5 8.50 4.75 7.75 3.5026 18 240 1 3 3 46 M MDH18Sl0 10.50 7.00 9.75 3.0026 18 240 3 1 3 46 M MDH18S3 10.50 7.00 9.75 3.0026 18 480 1 1 3 46 M MDH18S11 10.50 7.00 9.75 3.0026 18 480 3 1 3 46 M MDH18S5 10.50 7.00 9.75 3.0026 24 240 1 4 4 67 M MDH24S10 12.50 9.25 11.75 2.7526 24 240 3 2 4 67 M MDH24S3 12.50 9.25 11.75 2.7526 24 480 1 2 4 67 M MDH24S11 12.50 9.25 11.75 2.7526 24 480 3 1 4 67 M MDH24S5 12.50 9.25 11.75 2.7526 30 240 3 2 5 84 M MDH30S3 15.75 11.50 15.00 3.5626 30 480 1 2 5 84 M MDH30S11 15.75 11.50 15.00 3.5626 30 480 3 1 5 84 M MDH30S5 15.75 11.50 15.00 3.5626 36 240 3 2 6 95 M MDH36S3 18.00 13.75 17.25 4.1326 36 480 1 2 6 95 M MDH36S11 18.00 13.75 17.25 4.1326 36 480 3 1 6 95 M MDH36S5 18.00 13.75 17.25 4.1326 42 240 3 3 7 109 M MDH42S3 20.25 16.00 19.50 4.6926 42 480 1 3 7 109 M MDH42S11 20.25 16.00 19.50 4.6926 42 480 3 2 7 109 M MDH42S5 20.25 16.00 19.50 4.6926 48 240 3 4 8 137 M MDH48S3 22.50 18.25 21.75 5.2526 48 480 1 3 8 137 M MDH48S11 22.50 18.25 21.75 5.2526 48 480 3 2 8 137 M MDH48S5 22.50 18.25 21.75 5.2526 54 240 3 3 9 144 M MDH54S3 24.75 20.50 24.00 5.8126 54 480 1 3 9 144 M MDH54S11 24.75 20.50 24.00 5.8126 54 480 3 2 9 144 M MDH54S5 24.75 20.50 24.00 5.8126 60 240 3 4 10 165 M MDH60S3 27.00 22.75 26.25 6.3826 60 480 1 4 10 165 M MDH6OS11 27.00 22.75 26.25 6.3826 60 480 3 2 10 165 M MDH60S5 27.00 22.75 26.25 6.38• M - Manufacturing lead timesTruck Shipment onlyOptions include individual modules with optional general purpose housing, high-temperature thermocouple kit and blank flange modules.Modular duct heaters with 1 and 2 modules have conduit openings for one, 1 inch NPT fitting.Modular duct heaters with 3, 4, 5, and 7 modules have conduit openings for two, 1 inch NPT fittings.Modular duct heaters with 6, 8, 9, and 10 modules have conduit openings for two, 1 1 /4 inch NPT and two, 1 inch NPT fittings.WATLOW ®407
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Table of ContentsWhat type of heate
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Watlow’s Lead Time OptionsTo rema
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Heater Selection MatrixHeating Liqu
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Heater Selection MatrixHeating With
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Cartridge/Insertion HeatersMax. Ope
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Cartridge/Insertion HeatersFIREROD
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Cartridge/Insertion HeatersMin. No-
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Cartridge/Insertion HeatersExtended
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Cartridge/Insertion HeatersMetric F
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Tubular HeatersMax. Operating Typic
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Tubular HeatersWATROD Single/Double
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1" A1"Tubular HeatersWATROD Single/
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Tubular HeatersWATROD 1- 9WATROD 1-
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WATROD 1- 19Tubular HeatersWATROD S
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R 2R 2BWATROD 1- 31Tubular HeatersW
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figure 47 newTubular HeatersWATROD
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WATROD 2BTubular HeatersWATROD Sing
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Tubular HeatersThreaded Stud Termin
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Tubular HeatersExtendedCapabilityEx
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Tubular HeatersWATROD Double-Ended
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Tubular HeatersExtendedCapabilityWA
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Tubular HeatersExtendedCapabilityWA
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Tubular HeatersFIREBAR ® Single/Do
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1" 1" (25 (25 mm) mm)Min. Min. No N
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DDTubular HeatersFIREBAR Single/Dou
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Tubular HeatersFIREBAR Single/Doubl
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Tubular HeatersAFIREBAR Single/Doub
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Tubular HeatersFINBAR Single-Ended
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Flexible HeatersMax. Operating Typi
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Flexible HeatersFlexible Shapes and
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Flexible HeatersSilicone Rubber Hea
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Flexible HeatersLine HeatingModular
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Flexible HeatersLine HeatingSTRETCH
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Flexible HeatersLine HeatingSTRETCH
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Flexible HeatersPolyimide HeatersTe
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Flexible HeatersPolyimide HeatersSp
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Flexible HeatersSERIES EHGTechnical
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Flexible HeatersSERIES EHG SL10Tech
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Flexible HeatersSERIES EHG SL10Tech
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Flexible HeatersSERIES EHG CLTechni
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Flexible HeatersSERIES EHG CLTechni
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Immersion HeatersMax. Operating Typ
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Immersion HeatersWATROD and FIREBAR
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Immersion Heaters1" WATROD45⁄8 in
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Immersion Heaters¾ in. NPT Knockou
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Thermowell2.50" WATROD195½ in. Dia
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Immersion Heaters1.25" FIREBAR11WAT
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Immersion Heaters2" WATRODWATROD an
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Stand-offTerminalEnclosureConduitOp
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Direction of FlowImmersion HeatersW
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7½ in. Ref.(191 mm)75⁄8 in.(193.
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5"-150# FLANGEImmersion HeatersTher
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4"-150# FLANGEImmersion HeatersWATR
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6"-150# FIREBAR FLANGEImmersion Hea
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Immersion HeatersExtendedCapability
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Immersion HeatersOver-the-Side Heat
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Immersion HeatersOver-the-Side Heat
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Immersion HeatersFIREROD ® Immersi
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Immersion HeatersFIREROD Immersion
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Circulation HeatersMax. Operating T
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Circulation HeatersSTARFLOW Heaters
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Circulation HeatersWATROD and FIREB
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3½ in.Circulation HeatersWATROD an
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½ in.NPT DrainCirculation HeatersW
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Circulation Heaters2 1/2 NPTSCREW P
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4"-150# 4"-150#FLANGE FLANGE513⁄1
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Page 357 and 358: (163.5 mm)Circulation HeatersB¾ in
Page 361 and 362: ½ in.NPT DrainCirculation HeatersW
Page 367 and 368: 4"-150# 4"-150#FLANGE FLANGE513⁄1
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Page 373 and 374: FLANGE½ in.NPT DrainCirculation He
Page 383 and 384: Fluid Delivery HeatersMax. Operatin
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Page 389 and 390: Air HeatersDuct HeatersLDH SERIES a
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Page 399 and 400: Air HeatersDuct HeatersD SERIES®®
Page 401 and 402: Air HeatersDuct HeatersD SERIES®®
Page 405: Air HeatersDuct HeatersMDH SERIESWa
Page 409 and 410: Air HeatersFinned Heaters375 Finned
Page 411 and 412: 10-24 Threaded Terminals1.18 in.(30
Page 413 and 414: Air HeatersFinned Heaters375 Finned
Page 415 and 416: Air HeatersFinned HeatersFINBAR Sin
Page 417 and 418: Air HeatersEnclosure HeatersWATROD
Page 419 and 420: Air HeatersEnclosure HeatersSilicon
Page 421 and 422: Air HeatersEnclosure HeatersSilicon
Page 423 and 424: High-Temperature HeatersMax. Operat
Page 425 and 426: High-Temperature HeatersMULTICELL H
Page 431 and 432: High-Temperature HeatersExtended Ca
Page 433 and 434: High-Temperature HeatersCeramic Fib
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Specialty HeatersMax. Operating Typ
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Specialty HeatersULTRAMIC ® Advanc
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Specialty HeatersExtendedCapability
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Specialty HeatersThick Film Conduct
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Specialty HeatersExtendedCapability
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Specialty HeatersCoil/Cable Heaters
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Strip/Clamp-On HeatersMax. Operatin
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Strip/Clamp-On HeatersMineral Insul
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½ in.(13 mm) 10-24 Screw Thread¾
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Strip/Clamp-On Heaters375 High-Temp
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(30 mm)A7 ⁄8 in.(22.2 mm)3⁄8 in
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Strip/Clamp-On HeatersExtendedCapab
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Strip/Clamp-On Heaters375 High-Temp
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Strip/Clamp-On HeatersFIREBAR ® Cl
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Band/Barrel HeatersMax. Operating T
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Band/Barrel HeatersMineral Insulate
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wwBand/Barrel HeatersMineral Insula
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Nozzle HeatersMax. Operating Typica
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Nozzle HeatersMineral Insulated (MI
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Nozzle HeatersPre-Coiled Cable Nozz
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Radiant HeatersMax. Operating Typic
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Radiant HeatersRAYMAX ® Panel Heat
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Radiant HeatersRAYMAX Panel Heaters
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2 15 /16 in. (74.6 mm)Radiant Heate
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Thermostats and AccessoriesThermost
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Thermostats and AccessoriesST10 and
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Thermostats and AccessoriesST10 and
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SPSTP1 L1Thermostats and Accessorie
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Thermostats and AccessoriesBulb and
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Thermostats and AccessoriesInternal
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Reference DataReference DataPower C
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Reference DataPower CalculationsCal
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Reference DataPower CalculationsCon
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Reference DataPower CalculationsCon
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Reference DataEquationsOhm’s LawV
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Reference DataWattage RequirementsT
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Reference DataTubular Elements and
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Agency Certifications, Recognition
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IndexIndexProduct Category Index...
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IndexProduct Category Index375 Finn
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IndexPart Number IndexPartPageNumbe
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Terms and Conditions of SaleQuantit
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