1. Dual‑Mode Simplex (Commercial)
What it is:
One pump + 20‑gallon tank on a skid.
Works on pressure (dual‑mode: pressure or flow logic, but commercial is typically used in pressure mode).
Shuts off when flow is less than 3 GPM .
Handles up to ~70 GPM .
When to use it:
You need one pump to handle the building’s demand.
Flow requirement is up to about 70 GPM .
You want a pre‑assembled, ready‑to‑set unit with tank, skid, and piping already done.
Application examples:
Small commercial building
Smaller apartment building
Light industrial where one pump can cover the load and redundancy is not critical.
2. Dual‑Mode Duplex (Commercial)
What it is:
Two pumps + 20‑gallon tank on a skid.
Same dual‑mode control concept, but with lead/lag setup:
Pump 1 = lead (e.g., set at 60 PSI).
Pump 2 = lag (e.g., set at 50 PSI).
If the lead pump can’t keep up and pressure drops to the lag setpoint, the second pump starts and they run in tandem .
Shuts off when flow is less than 3 GPM .
Handles up to ~120 GPM .
Can be set up so either pump alone can satisfy demand (full redundancy).
When to use it:
You need higher flow than a simplex can provide (up to ~120 GPM).
You want redundancy / backup :
If one pump or its controls fail, the other can still run the building.
Ideal for:
Larger apartment complexes
Factories or industrial processes
Commercial buildings where downtime is not acceptable and/or demand can spike above what a single pump can handle.
3. Dual‑Mode Modular (Commercial)
What it is:
Same pump, motor, and control as the simplex/duplex units, but without :
The skid
The tank
The factory plumbing between tank and outlet
Essentially a “bare” booster package you can plumb into an existing system .
When to use it:
You already have a tank and piping in place and:
Don’t want to replace the tank.
Want to tie a booster into an existing system .
You want the same performance as a simplex unit but integrated into your own layout .
Good fit when:
A building already has a pressure tank and header, and you’re just adding a booster .
Space or layout makes a factory skid/tank package inconvenient.
Practical selection guide
Use Dual‑Mode Simplex if:
One pump can handle your flow (≤ ~70 GPM),
You want a complete, pre‑assembled package with tank and skid,
Redundancy is nice but not critical .
Use Dual‑Mode Duplex if:
You need more flow (up to ~120 GPM), and/or
You need backup so the system can keep running if one pump fails,
You’re serving larger commercial, industrial, or multi‑unit residential loads.
Use Dual‑Mode Modular if:
You already have a tank and system piping ,
You just need to add a booster pump into that existing system,
You don’t want or don’t have room for a full skid/tank assembly.
