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TQ Booster Pumps
By Walrus

The Walrus TQ series are all-in-one units consisting of pump, motor, pressure tank, and electronic controller. These quality booster pumps from Walrus Pumps, Inc. offer durability and value in one great pump. Click here for links to many other pumps we offer!

TQ Series, 60 Hz Electronic Control Pumps

  • The TQ comes complete with pump, motor, pressure tank, and electronic controller all in one unit. The electronic controller ensures the pump starts automatically when water is utilized, providing constant pressure, and operates continuously until water is no longer required and is turned off.
  • Constructed from corrosion resistant stainless steel and glass filled noryl materials
  • Operates quietly in a compact housing.
  • Suitable for use in gravity flow storage tanks, low pressure well systems, home additions, and numerous other low water pressure applications.
  • The TQ pumps have an automatic shut off if they run dry for 2 minutes. The pump will shut off for ten minutes and then attempt to restart. If three attempts are made and all three attempts fail again, due to dry run, the pump will rest for one hour and then attempt to restart. This protection sequence will continue until the water supply is back to normal.
  • The motor has a built-in thermal overload to protect against high operating temperatures and over current. (Single phase motor)
  • These TQ pumps have an anti-cycling feature to help prevent the pump from continuous starting and stopping if you have a dripping faucet or minor leak in your system.
  • The TQ pumps are able to pump water from depths of 25 feet or less. However, on installations with suction lifts higher than 3 feet a good quality foot valve must be be installed and the piping filled with water.

The TQ series pumps are designed for water supply pressure boosting in residential, commercial and light industrial applications where low or inadequate water pressure exists. It is suitable for boosting pressure from underground or surface water supplies.

SUITABLE LIQUIDS: Potable water or other clean, thin and non-aggressive liquids.

  • Indoor use only
  • Ambient temperature: Max. +104°F
  • Liquid temperature: +39°F ~ +104°F
  • Relative humidity: Max. 85% (RH)
  • System pressure: not to exceed MAXIMUM 120 PSI (inlet supply pressure + maximum discharge pressure = system pressure)
  • The incoming water pressure must be lower than the factory start pressure setting for these pumps to function correctly. If your incoming water pressure is higher than the factory start pressure setting then choose a larger pump that has a factory start pressure setting higher than your incoming water pressure.
  • The internal flow switch will turn the pump on when it detects water flow of 0.75 GPM or greater
Model # Power
Phase Voltage
Inlet / Outlet
Start Pressure
Setting (PSI)
Max. Discharge
(max FT)
(max GPM)
TQ200 1/4 60 1 115 4.0 1" 20 31 72 16.9
TQ400 1/2 60 1 115 or 230 6.0/3.0 1" 28 40 92 18.5
TQ800 1 60 1 115 or 230 11/5.5 1" 36 67 154 23.8
TQ1500 2 60 1 / 3 230 9.5/6.5 1-1/2" 43 58 134 66.0
TQ2200 3 60 3 230 9.5 2" 43 60 138 71.3
TQ3700 5 60 3 230 12 2" 43 72 167 71.3

NOTE: Specifications are subject to change without notice.

TQ Series, 60 Hz Electronic Control Pumps

Model # HP Description Volts Price & Quantity
TQ200 1/4 1 Phase Electronic Control Water Pump 115V $294.99
TQ400 1/2 1 Phase Electronic Control Water Pump 115V $335.96
TQ400 1/2 1 Phase Electronic Control Water Pump 230V $336.21
TQ800 1 1 Phase Electronic Control Water Pump 115V $408.88
TQ800 1 1 Phase Electronic Control Water Pump 230V $410.93
TQ1500 2 1 Phase Electronic Control Water Pump 230V $839.96
TQ1500 2 3 Phase Electronic Control Water Pump 230V $839.98
TQ2200 3 3 Phase Electronic Control Water Pump 230V $896.75
TQ3700 5 3 Phase Electronic Control Water Pump 230V $962.88

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pump performance curve

City Water Supply Pressure Reducing Requirements

If your incoming water pressure is greater than 50 psi, (or 45 psi if using the TQ3700) then a pressure reducing valve must be installed on the suction side (inlet side) of the pump, even if you already have a pressure reducing valve provided by your local water utility. Many city water utilities use pressure reducing valves which are typically set for 80 or 90 psi, but this high of a pressure combined with the discharge pressure the pump creates will damage the pump because it will exceed the maximum 120 psi system pressure.

The chart below shows what pressure the pressure reducing valve should be set according to which pump you have.

Local Code Limits
For Home Pressure
Pressure Reducing Valve Setting (psi)
TQ200 TQ400 TQ800 TQ1500 TQ2200 TQ3700
90 psi or higher 50 50 25 30 30 20
80 psi 45 40 15 20 20 10

Suction Lift Performance table

(with foot valve and pump suction pipe filled with water)
Suction Lift Performance Table

TQ200, TQ400, TQ800 pump dimensions

TQ1500, TQ2200, TQ3700 pump dimensions

Pump Construction Materials

list of pump construction materials

Related Items & Information

Frequently Asked Questions

Q. "How are the TQ pumps activated?"
A. The TQ pumps have a built-in pressure switch and internal flow switch. Either one of these will activate the pump depending on water consumption. The pump will start when the pressure is BELOW the pressure switch activation point, or the water flow rate is greater than 0.7 GPM. The preset pressure switch activation point for each model is provided in the pump specifications chart listed under "Factory Start Pressure Setting (PSI)." The incoming water pressure must be lower than the preset activation point; otherwise the pump will not start.

Q. "Are the TQ Series pumps self-priming?"
A. No. The TQ Series pumps must be primed before operation. The TQ pumps have a built-in check valve, that will allow the pump to then pump water from depths of 25 feet or less without the worry of priming the pump each time as long as a foot valve is installed at the suction inlet. However, the pump must always be checked for prime if not used for a prolonged period of time. It is imperative to fill the pump with water before operation as dry running causes irreparable damage to the mechanical seal.

Q. "Can the 'start pressure setting' be adjusted?"
A. No, these pumps are supplied with a factory preset pressure switch and are not designed to be field adjusted.

Q. "What is the purpose of the built-in pressure tank?"
A. It is designed to help keep the motor from repeatedly cycling on and off due to small flow demand or a minor leak in your water system. The built-in pressure tank holds a certain amount of water and if there is a minor leak in the piping system the water will slowly leave the pressure tank. This will steadily reduce the pressure until it falls below the pressure switch activation point (Factory Start Pressure Setting) and turns the pump on to bring the pressure back up. Pumps last longer by having longer running times and fewer cycles. The built-in pressure tank will usually be sufficient for a minor leak. But if the leak is causing the pump to cycle on and off too frequently then the leak should be fixed.

If the pump is cycling on and off because of something being used in the system like a slow closing float valve or slow running faucet, or other condition, then an extra external pressure tank (typically 2-3 gallon) can be added to the discharge side of the pump which can decrease the on/off cycle rate of the pump and help extend the life of the pump. drawing of pump with extra pressure tank added

Q. "How does the anti-cycling feature work to prevent the pump from continuously starting and stopping?"
A. The pump will run for 8 seconds and then stop for approximately 3 seconds. If this type of cycling repeats itself 15 times in a row then the pump will turn off and rest for 1 hour. After an hour it will again start and if the same type of repeat cycling occurs (15 times) it will again shut off and rest for 1 hour. This will continue until the problem is corrected. This automatic protection will occur if the pump is repeatedly cycling on and off caused by small flow rates (less than 0.3 GPM), an air pocket in the system, a leak in the pipeline, or an air loss in the pressure tank.

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