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Burnham V9A User Manual

Page 41

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Figure 36: Minimum Piping Requirements for V9A Tankless Heater Manifolds

Figure 37a: Schematic Tankless Heater Piping

Notes:
1. Ratings are given in gallons per minute continuous

flow of water heated from 40°F to 140°F with 200°F

boiler water.

2. For tankless heater quantities less than maximum

allowable, it is important that water heaters be

centrally located in the boiler.

See Figure 8 for appropriate locations.

3. Tankless heater pressure drop is 5.5 PSI at

7.5 GPM.

Boiler

Model

Number of V9-2 Tankless Heaters Installed

1

2

3

4

V903A

6.75

---

---

---

V904A

7.5

---

---

--

V905A

7.5

---

---

---

V905A

7.5

---

---

---

V906A

7.5

15

---

---

V908A

7.5

15

---

---

V909A

7.5

15

22.5

---

V910A

7.5

15

22.5

---

V911A

7.5

15

22.5

---

V912A

7.5

15

22.5

30

Table IV: Tankless Heater Ratings