Norweco HB-105 Pump

Norweco HB-105 High Head Effluent Pump Specs, Uses, and Troubleshooting

The Norweco HB-105, often written HB105, is a high head submersible effluent pump used where treated or filtered wastewater has to move under pressure. It can appear in Norweco pumping stations, spray systems, drip systems, pressure distribution, and other advanced onsite wastewater designs.

High head pump Filtered effluent Spray systems Drip dosing TDH matters
Ask about a pump alarm Norweco parts hub Pump service
Pressure systems depend on the pump curve Horsepower alone does not prove a replacement will meet the design pressure, flow, or total dynamic head.

Quick homeowner answer

The HB-105 is a 1/2 horsepower, 115 volt, high head submersible effluent pump used to move filtered septic effluent to downstream components like drip tubing, spray heads, pressure distribution, or another treatment step. Norweco's Simplex Model HB105 listing states delivery capacity up to 28 GPM and total dynamic head capability up to 125 feet. Before replacing one, verify the pump curve, downstream pressure requirement, float setup, control panel, and Ohio approval path.

Core specs to verify

ComponentHigh head submersible effluent pump for filtered effluent
Motor1/2 HP, 3450 RPM, 115 volt single phase 60 cycle in Norweco specs
Capacity noteUp to 28 GPM and up to 125 feet TDH in Norweco HB105 listing
Solids passage1/16 inch spherical solids, based on Norweco parts specifications
ControlsFloats, alarms, pump basin, panel, and downstream pressure tests matter
Related systemsDrip, spray, pressure dosing, and NPDES configurations

Official HB105 pump curve and spec chart

Norweco publishes the HB105 reference data in the Simplex Pump Specifications and publishes a plotted high-head effluent pump curve in the official Drip Pre-Engineered Designs Parts List. The curve matters because maximum delivery and maximum head are not the same operating point. Flow drops as total dynamic head rises.

FieldHB105 published valueWhy it matters on site
Pump typeHigh head effluentBuilt for filtered effluent and pressure applications, not raw sewage or grinder service.
Voltage115 voltPanel, breaker, wire, float, and control-center setup must match the installed system.
Horsepower1/2 HPHorsepower is only one data point. It does not replace pump curve and TDH review.
Speed3450 RPMHelps distinguish this high-head pump from lower-head effluent pumps.
Solids passage1/16 inchThis reinforces that upstream filtration and treatment condition matter.
Discharge1 1/4 inch NPTDischarge plumbing, union, valve, and force-main sizing affect friction loss.
Maximum delivery28 GPMThis is the high-flow end of the public data chart, not a promised operating flow at every job.
Maximum TDH125 feetThis is the high-head end of the public data chart. Actual flow depends on the system curve.
Norweco-source HB105 pump curve Total head in feet Capacity gallons per minute 250 200 150 100 50 0 0 10 20 30 40 50
How to read the curve

The left axis is total head in feet. The bottom axis is capacity in gallons per minute. A real system has to land on the curve after elevation lift, force main friction, valves, filter loss, and required spray or drip pressure are counted.

Use the official curve with the approved design. Do not choose a replacement pump by horsepower alone.

High-head endpoint125 feet maximum TDH

This is the maximum total dynamic head value in Norweco's public reference data chart.

High-flow endpoint28 GPM maximum delivery

This is the maximum delivery value in Norweco's public reference data chart.

Actual operating pointRequires site TDH and pressure review

The real operating point depends on elevation, force main, fittings, valves, filters, spray-head pressure, drip pressure, and design dose.

The missing step on many replacement quotes is the system curve: vertical lift, force-main length, pipe diameter, fittings, valves, filter loss, spray-head pressure, drip-zone pressure, and design dosing rate. Without that, the page can show the manufacturer's published endpoints, but it cannot honestly prove the final operating point.

Why the HB-105 matters

In a gravity septic system, flow moves downhill. In a pressure system, the pump has to deliver the right amount of treated effluent at the right pressure. Too little capacity can leave spray heads weak, drip zones underdosed, or pressure distribution uneven. Too much capacity or the wrong pump curve can stress downstream components, short-cycle controls, or move effluent faster than the design allows.

What can look like pump failure

Possible pump-related symptoms
  • High-water alarm at the pump tank.
  • Spray heads not popping up or throwing the expected radius.
  • Drip zone not dosing or flushing correctly.
  • Pump runs but no effluent reaches the field.
  • Breaker trips when the pump should start.
  • Service provider cannot achieve design pressure at the test port.
Other causes to check
  • Clogged disc filter, nozzle, valve, force main, or downstream line.
  • Float failure, float spacing problem, bad relay, or miswired controls.
  • Wrong pump curve for total dynamic head.
  • Low voltage, water intrusion, damaged cord, or electrical fault.
  • Solids loading from poor upstream filtration.

Replacement logic

1Confirm the exact modelHB105 and HB-105 are common field names, but use the exact model shown on the pump, panel, design, or Norweco paperwork.
2Check the downstream useSpray, drip, pressure dosing, lift, and remote dispersal all have different flow and pressure requirements.
3Verify total dynamic headElevation, pipe length, friction, valves, filters, fittings, and operating pressure all affect the real pump point.
4Retest after serviceConfirm pressure, dose, floats, alarm reserve, pump drawdown, and service record after replacement.

Maintenance tips

  • Do not replace by horsepower alone. Pump curve and total dynamic head matter more than the label.
  • Inspect filters before condemning the pump. A clogged filter can make a good pump look weak.
  • Keep solids out of the pump basin because the HB-105 is specified for filtered effluent.
  • Document float elevations, alarm reserve, measured pressure, and measured flow after service.
  • If the system is under NPDES, spray, drip, or operation permit requirements, keep service records with the local file.

Internal links for the next decision

Bio-Kinetic filterFiltered effluent and solids control matter before the pump basin and pressure equipment. AT 1500 UVDisinfection often sits downstream of treatment and upstream of discharge or spray paths. A20 air pumpSome NPDES trains use post-aeration after UV before sampling and discharge. Drip septic systemsDrip zones depend on pressure, filtration, flushing, and dosing. Advanced septic systemsHow spray, drip, mound, and chamber systems change component choices. Septic system costMechanical systems carry installation, service, repair, and life-cycle costs.

Frequently asked questions

Is the Norweco HB-105 a sewage pump?

No. It is a high head effluent pump for filtered effluent. It is not a grinder pump and should not be treated as a raw sewage pump.

How much can the HB-105 pump?

Norweco's Simplex Model HB105 listing states delivery capacity up to 28 GPM and total dynamic head capability up to 125 feet. Actual operating flow depends on the system head and pump curve.

Can I replace it with another 1/2 HP pump?

Not safely without checking the pump curve, controls, solids handling, approval, and design pressure. Horsepower alone is not enough.

Official sources

ManufacturerNorweco Simplex Pump Unit
ManufacturerNorweco Simplex Pump Specs
ManufacturerNorweco Drip Pre-Engineered Parts List
OhioODH approved sewage products

Have a high-water alarm or weak spray field?

Send the pump model, panel photo, basin photo, alarm status, and system design if available. BE Ohio can help decide whether the problem is the pump, floats, filter, controls, or downstream pressure system.

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