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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
ow 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