Watlow Heater Catalog

Air Heaters

Duct Heaters MDH SERIES

®

®

D Typ.

A

3 1 / 2 in. (89 mm) Typ.

B

11 5 / 8 in. (295 mm)

8 in. (203 mm)

10 1 / 2 in. (267 mm)

C

12 in. (305 mm)

1 / 4 in. (6.35 mm)

21 3 / 4 in. (552 mm) 26 1 / 16 in. (662 mm)

3 / 8 in. (9.5 mm) Diameter

Application: Air Heating – Maximum Outlet Temperature – 750°F (399°C)

WATCONNECT P/N

Dimensions in.

Watt Density W/in 2

Est. Shipping Wt. lbs

No. of Circuits

No. of Modules

Part Number

kW

Volts Phase

J T/C K T/C A B C D

MDH6S10 MDH6S3 MDH6S11 MDH6S5

C/F C/F C2-50 C2-92 C/F C/F C2-43 C2-35

26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26

6 240 1 6 240 3 6 480 1 6 480 3 12 240 1 12 240 3 12 480 1 12 480 3 18 240 1 18 240 3 18 480 1 18 480 3 24 240 1 24 240 3 24 480 1 24 480 3 30 240 3 30 480 1 30 480 3 36 240 3 36 480 1 36 480 3 42 240 3 42 480 1 42 480 3 48 240 3 48 480 1 48 480 3 54 240 3 54 480 1 54 480 3 60 240 3 60 480 1 60 480 3

1 1 1 1 2 1 1 1 3 1 1 1 4 2 2 1 2 2 1 2 2 1 3 3 2 4 3 2 3 3 2 4 4 2

1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9

35 35 35 35 39 39 39 39 46 46 46 46 67 67 67 67 84 84 84 95 95 95

6.50 2.50 5.75 2.50 6.50 2.50 5.75 2.50 6.50 2.50 5.75 2.50 6.50 2.50 5.75 2.50 8.50 4.75 7.75 3.50 8.50 4.75 7.75 3.50 8.50 4.75 7.75 3.50 8.50 4.75 7.75 3.50 10.50 7.00 9.75 3.00 10.50 7.00 9.75 3.00 10.50 7.00 9.75 3.00 10.50 7.00 9.75 3.00 12.50 9.25 11.75 2.75 12.50 9.25 11.75 2.75 12.50 9.25 11.75 2.75 12.50 9.25 11.75 2.75 15.75 11.50 15.00 3.56 15.75 11.50 15.00 3.56 15.75 11.50 15.00 3.56 18.00 13.75 17.25 4.13 18.00 13.75 17.25 4.13 18.00 13.75 17.25 4.13 20.25 16.00 19.50 4.69 20.25 16.00 19.50 4.69 20.25 16.00 19.50 4.69 22.50 18.25 21.75 5.25 22.50 18.25 21.75 5.25 22.50 18.25 21.75 5.25 24.75 20.50 24.00 5.81 24.75 20.50 24.00 5.81 24.75 20.50 24.00 5.81 27.00 22.75 26.25 6.38 27.00 22.75 26.25 6.38 27.00 22.75 26.25 6.38

MDH12S10 C/F C/F MDH12S3 C2-236 C2-214 MDH12S11 C/F C/F MDH12S5 C2-43 C2-35 MDH18S10 C/F C/F MDH18S3 C2-236 C2-214 MDH18S11 C/F C/F MDH18S5 C2-43 C2-35 MDH24S10 C/F C/F MDH24S3 C2-218 C2-224 MDH24S11 C/F C/F MDH24S5 C2-225 C2-226 MDH30S3 C2-218 C2-224 MDH30S11 C/F C/F MDH30S5 C2-225 C2-226 MDH36S3 C2-218 C2-224 MDH36S11 C/F C/F MDH36S5 C2-225 C2-226 MDH42S3 C4-144 C4-145 MDH42S11 C/F C/F MDH42S5 C2-229 C2-230 MDH48S3 C4-148 C4-149 MDH48S11 C/F C/F MDH48S5 C2-229 C2-230 MDH54S3 C4-144 C4-145 MDH54S11 C/F C/F MDH54S5 C2-229 C2-230 MDH60S3 C4-148 C4-149 MDH60S11 C/F C/F MDH60S5 C2-229 C2-230

109 109 109 137 137 137 144 144 144 165 165 165

10 10 10

Options include individual modules with optional general purpose terminal enclosure, high-temperature thermocouple kit and blank flange modules.

C/F - Contact factory, go to www.watlow.com/en/contact-us

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.

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