Gravity Film Heat eXchanger (GFX) Models

Manufactured By Doucette Industries, Inc. York, PA

(Cross Reference Table To Doucette's Stock Numbers)

 

GFX*

MODEL

(.pdf)

UL

App.

DRAIN IN/OUT
(DWV)

COLD

IN/OUT

Type-L

LOA
(inches)

DHR**

EFF.

PRESS

DROP
(psi)

Ship

Wgt

(lbs)

SAMPLE

APPLICATIONS

 

G3-60

 

Yes

 

3 & 3

 

1/2"

 

60

 

60%

 

8

 

49

Single Bathroom Homes

Industrial Cooling-Walls

Hydronic Heating

G3-40

Yes

3 & 3

1/2"

40

49%

5

32

Restricted Height Location

G3-30

Yes

3 & 3

1/2"

30

41%

4

24

 

G4-60

 

Yes

 

4 & 4

 

1/2"

 

60

 

67%

 

11

 

64

Single Bathroom Homes

Industrial Cooling-Walls

Hydronic Heating

G4-40

Yes

4 & 4

1/2"

40

56%

7

40

Restricted Height Location

G4-30

yes

4 & 4

1/2"

30

48%

5

31

 

S3-60

 

Yes

 

3 & 3

 

3/4"

 

60

 

57%

 

<2

 

49 

Whole House Model

Hi-Flo Pressure Drop 1/6th G3-60

S3-40

Yes

3 & 3

3/4"

40

47%

<2

32

Restricted Height Location

S3-30

Yes

3 & 3

3/4"

30

39%

<2

24

 

S4-60

 

Yes

 

4 & 4

 

3/4"

 

60

 

62%

 

<3

 

64

Whole House Model

Hi-Flo Pressure Drop 1/6th G4-60

S4-40

Yes

4 & 4

3/4"

40

53%

<2

40

Restricted Height Location

S4-30

Yes

4 & 4

3/4"

30

46%

<2

31

 

P3-60

 

NO

 

2 & 3

 

3/4"

 

601/8

 

74%

 

<3

 

105

Commercial Dishwashers, Beauty Shops, Gang Showers, etc.

P3-40

NO

2 & 3

3/4"

461/4

64%

<3

55

Restricted Height Location

P3-30

NO

2 & 3

3/4"

351/4

56%

<2

49

 
PS4-60

 

NO

 

2 & 4

 

1"

 

601/8

62%

(4.5 gpm)

 

<2

 

116

Two Manifolded S4-60 GFX's

Hi-Flo Pressure Prop 1/6th P4-60

 

P4-60

 

NO

 

2 & 4

 

3/4"

 

601/8

 

79%

 

<4

 

111

Commercial Dishwashers, Beauty Shops, Gang Showers, etc.

 

M2P4-60

 

NO

 

2 & 4

 

1"

 

601/8

79%

(4.5 gpm)

 

<2

 

235

Two P3-60s With 1 Drain & 2 Cold In/Out Water Manifolds

 

G3-60-3

 

Yes

 

3 & 3

 

3/4"

 

60

 

55%

 

<2

 

53

3-coil Special For Troutdale Terrace Apartment Project

 

G4-80-4

 

Yes

 

4 & 4

 

1

 

797/8

63, 52, 38%

(2.25, 4.5

& 9 gpm)

0.5, 1.2, 3.3

(2.25, 4.5

& 9 gpm)

 

64

 

4-coil Special For New Jersey Apartment Project

 

S2-60

 

Yes

 

2

 

1/2"

 

20

 

49%

 

<3.5

 

35

2-coil Special For Troutdale Terrace Project in Troutdale, OR

 

G2-30

 

Yes

 

2

 

3/8"

 

30

 

33%

 

<9

 

15

Crawl Spaces, Single Shower, Under Sinks, Ice Machines, etc.

G2-24

Yes

2

3/8"

24

28%

<7

12

G2-20

Yes

2

3/8"

20

24%

<6

10

 

G2-12

 

NO

2

(Type L)

 

3/8

 

12

13.5%***

(1; >5 gpm)

 

0.7

 

3

Tap heat off hot water recirc- loop to eliminate inline water 

 

G1.5-12

 

NO

1.5

(Type L)

 

3/8

 

12

10.3%***

(1; >5 gpm)

 

0.7

 

3

heaters & save water by

providing instant hot water.

Other Unlisted Models

G4-48, G3-50, S4-65, G4-66-2, S3-74, S4-74

 

 

Note: Coil & drain flow rates are 2.25 gpm unless specified otherwise.

* G Models - 1/2" Type-L coils on Type-DWV copper tube.

* S Models - two 1/2" Type-L coils manifolded on single Type-DWV copper tube.
* P Models - G or S models manifolded together.

** Nominal Drainwater Heat Recovery (DHR) Efficiency for balanced flow near 2.25 gallons per minute (gpm).

*** Nominal effectiveness for coil flow rate of 1 gpm and a flooded-tube flow-rate greater than 5 gpm.

Non-standard models having 3 or more coils on single 2", 3" or 4" copper or stainless tubing is available upon request.
List prices and models are subject to change without notice.

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