Water Heaters REX Heat Exchangers

REX Tank Heat Exchangers

Instantaneous Indirect Water Heaters



The new generation REX instantaneous indirect water heaters are engineered for high heating efficiency. REX heaters use the boiler to heat domestic water instantly upon demand. As the boiler water enters the tank (not the coils) it is stored, ready for a domestic water call.

REX heaters also act as a buffer tank to eliminate boiler short cycling. The boiler water is circulated in a closed loop system, thus extending boiler life.

The REX indirect instantaneous system offers high efficiency, long life and an economical way of heating domestic water as there is no stagant water in the coils. it virtually eliminates bacterial growth.

Superior Hydrodynamics Improve Heat Transfer


The stainless steel distributor is the key to proper distribution of the boiler water over the coil tubes to give peak heat transfer as the hot water cascades through the coils, providing greater turbulence as it reaches the bottom distributor plate.

   

Applications
  • Domestic
  • Commercial and industrial institutions (hotels, apartments, schools, hospitals)
  • Excellent for closed temperature approach applications

Standard Materials

  • Completely passivated stainless steel construction.

Maximum Working Pressure

  • Up to 150 PSI (1.03 MPa)

Maximum Working Temperature

  • Up to 375°F (190°C)
 

Rex Performance



Characteristics

REX-150

REX-190

REX-300

REX-435

Tank Capacity (gal)

40

50

80

115

Heating Surface Area (sqft)

34.4

39.9

39.9

72.9

Connections (inch)

 

 

 

 

Domestic - NPT

1"

1-1/2"

1-1/2"

2"

Boiler - NPT

1"

1-1/2"

1-1/2"

2"

Dimensions

 

 

 

 

Diameter (inch)

19.8"

23.4"

23.4"

28.1"

Height (inch)

61.7"

51.2"

75.7"

77.0"

Weight (lbs)

102

118

180

285

 

Coil Side Pressure Drop (PSI)

Flow (GPM)

5

10

15

20

25

30

REX150

1.50

5.30

12.0

-

-

-

REX190

1.10

3.90

8.70

16.2

-

-

REX300

1.10

3.90

8.70

16.2

-

-

REX435

0.10

1.00

2.25

4.50

7.00

11.25

 

Tank Side Pressure Drop (PSI)

Flow (GPM)

10

20

30

40

60

100

REX150

0.62

2.53

5.75

-

-

-

REX190

0.10

0.40

0.90

1.60

-

-

REX300

0.11

0.44

1.00

1.79

-

-

REX435

0.05

0.18

0.40

0.72

1.15

3.00

 

REX Performance

BTU/HR

Flow (GPH) @ 1100F

Flow (GPH) @ 1400F

Flow (GPH) @ 1800F

RX150

RX190 RX300

RX435

RX150

RX190 RX300

RX435

RX150

RX190 RX300

RX435

50,000

87

87

87

60

60

60

43

45

46

100,000

171

171

171

120

120

120

80

82

85

150,000

257

257

257

180

180

180

120

124

128

200,000

348

348

348

244

244

244

162

162

174

250,000

428

428

428

300

300

300

200

206

214

300,000

514

514

514

360

360

360

-

248

257

400,000

-

685

685

-

480

480

-

331

342

500,000

-

-

857

-

600

600

-

-

400

600,000

-

-

1028

-

-

720

-

-

480

700,000

-

-

-

-

-

840

-

-

560

800,000

-

-

-

-

-

960

-

-

640

900,000

-

-

-

-

-

1080

-

-

-

Continuous flow based on incoming domestic water @ 400F and Boiler water @ 1800F and leaving Boiler water @ 1600F

Specifications may change without notice. Contact AIC to verify product specifications and preformance.



CERTIFICATION

ASME Certification



UL Listing Certified Heat Exchangers
ISO 9000

CE Certified