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SPECIFICATIONS

Inlet Size . . . . . . . . . . . . .

1

/

2

NPT

Outlet Size . . . . . . . . . . . .

1

/

2

inverted flare

Outlet Adapter Fittings . . . . . . . .

1

/

2

inverted flare x

3

/

8

NPT reducer

(furnished with controls noted below)

adapter.

1

/

2

x

1

/

2

inverted flare outlet

extension adapter

Mounting . . . . . . . . . . . . .

3

/

4

NPT, 4

1

/

2

bulb insertion length

Pilot Connection . . . . . . . . . .

1

/

4

compression fitting

37C SERIES GAS WATER HEATER CONTROLS

For Replacement of Standard Gas Water Heater Controls with

Built-In E.C.O. (Energy Cut Off)

FEATURES

• Automatic shut-off of main and pilot gas in the event of pilot failure.

• Pilot gas cock with safe lighting feature and filter.

• Temperature adjustment.

• Manifold pressure tap.

• Built-In E.C.O. (Energy Cut Off) non-cycling high limit.

37C73U-168

RESIDENTIAL WATER

HEATER CONTROLS

Replacement Gas Water Heater Controls

Model

Number

Replaces OEM

Model Number

Main Burner

Pilot

Temperature

Range

Shank Length

OEM

37C73U-171

37C73U-274

4.0

W.C. Nat. Gas

4.0

W.C. Nat. Gas

70° - 160°F

2

1

/

2

A. O. Smith

37C73U-173

37C73U-640

4.0

W.C. Nat. Gas

4.0

W.C. Nat. Gas

70° - 160°F

1

1

/

4

A. O. Smith

37C73U-172

37C73U-641

4.0

W.C. Nat. Gas

4.0

W.C. Nat. Gas

70° - 160°F

2

1

/

4

A. O. Smith

37C73U-174

37C73U-652

5.0

W.C. Nat. Gas

5.0

W.C. Nat. Gas

70° - 160°F

1

1

/

4

A. O. Smith

37C73U-170

37C73U-836

4

.

0

W.C. Nat. Gas

4.9

W.C. Nat. Gas

70° - 160°F

1

Rheem

Model

Number

Pressure Regulation

Temperature

Range

Shank

Length

Gas

Type

Main Burner

Pilot

37C73U-168

3.5

W.C.

(A.O. Smith Style)

4.0

W.C. 70 to 160°F (21 to 71°C)

1

1

/

4

Natural Gas

(Right hand threads)

37C72U-185

10.0

W.C.

10.0

W.C. 70 to 160°F (21 to 71°C)

1

1

/

4

L.P. Gas

(Left hand threads)

Outlet adapter fittings included.

Includes Left Hand outlet extension fittings:

1

/

2

LH x

1

/

2

LH inverted flare and

1

/

2

LH x

3

/

8

LH inverted flare

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