Franklin Electric MH Series Horizontal Multi-Stage Booster Pump & Parts

Franklin Electric MH Series Booster Pump models give homes, businesses, irrigation systems and water-transfer installations a practical way to raise pressure with stainless-steel horizontal multi-stage pump construction. Ken’s Distributing Company supplies MH complete pumps and helps source OEM repair parts. Compare the 15, 30 and 45 GPM models for residential and light-commercial duties, or the 70 and 90 GPM models for larger commercial systems. Send your required flow, total dynamic head, voltage, or existing model number for a price and availability quote.

Quick selection: The 15–45 GPM group uses 1/2 to 2 HP single- or three-phase motors, 225°F maximum liquid temperature, and up to 140 PSI family pressure capability. The 70–90 GPM group includes 4 to 7.5 HP three-phase close-coupled models, with separate hydraulic curves and operating-temperature limits. Both complete-pump selection and repair-part fitment begin with your full model and item number.

The BT4 Series is listed with it under Franklin horizontal booster pumps if your flow needs are smaller.

Franklin Electric MH Series Booster Pump: Quick Specifications

The GPM values identify nominal hydraulic families, not a guaranteed flow at every pressure. Compare the exact performance curve with your flow and required total dynamic head. The 145 PSI working-pressure limit and 280-foot head limit on the 70–90 GPM family are different measures and must not be treated as one duty point.

Which Franklin Electric MH Booster Pump Should You Choose?

• 15 GPM: Smaller residential water-supply and pressure-boosting systems where flow demand is moderate and stage count sets the head range.
• 30 GPM: Multiple fixtures, larger homes, irrigation zones and light-commercial water service needing more flow.
• 45 GPM: Commercial fixtures, irrigation and transfer applications requiring a larger hydraulic connection.
• 70 and 90 GPM: Higher-demand commercial supply, washdown, distribution and compatible cooling-water applications with a three-phase electrical supply.

For an accurate pump quote, provide both the needed GPM and total dynamic head in feet, plus the incoming pressure, supply voltage, liquid temperature and pipe sizes. If you are replacing an MH pump, its existing manufacturer item number is an ideal starting point.

15–45 GPM Single-Phase MH Pump Models and Item Numbers

These motor-and-pump configurations use listed 115/230 V single-phase electrical service. The stage count changes the pressure curve; horsepower alone does not establish the correct replacement.

15–45 GPM Three-Phase MH Pump Models and Item Numbers

Choose these for three-phase service. Franklin’s detailed catalog lists 208–230/460 V for this group; verify motor nameplate and starter/control requirements before installation.

70–90 GPM Three-Phase MH Pump Models and Item Numbers

The five higher-flow models have a close-coupled motor, stainless-steel impellers and diffusers, and model-specific stage arrangements. The catalog lists 220/440 V three-phase service.

How to Read MH Model Numbers and Stages

In 30FMH2S5, the leading 30 denotes the nominal 30 GPM family, 2 indicates 2 HP, and S5 denotes a five-stage configuration. The -T suffix identifies the three-phase version on 15–45 GPM listings. The larger 70/90 models use the P-63 designation; refer to their separate hydraulic specifications.

Different stage counts can have different shut-off heads and service parts even when the nominal GPM and horsepower are similar. The full model code and item number are therefore important when requesting a motor, shaft, impeller assembly or casing.

Performance, Connections and Installation Fit

Manufacturer performance charts are published for each 15, 30, 45, 70 and 90 GPM family. Check the required duty point and suction conditions rather than selecting a booster on the highest advertised pressure, horsepower or nominal flow.

Franklin Electric MH Pump Features and Applications

15–45 GPM Stainless-Steel Multi-Stage Pumps

• Multiple stainless-steel hydraulic stages develop pressure for residential and light-commercial supply, fountains, turf irrigation, washdown and water transfer.
• 300-series stainless-steel wetted components and an FKM shaft seal support the listed clean-water and compatible liquid applications.
• Liquid temperatures up to 225°F and up to 10 feet of suction lift are available within published installation limits.
• Single- and three-phase motor selections allow the pump to match available electrical service.

70–90 GPM Close-Coupled MH Pumps

• Close-coupled, high-efficiency three-phase construction saves space in larger commercial mechanical rooms.
• 300-series stainless-steel impellers and diffusers, floating PPS neck ring and robust bearing design support clean-water operation.
• IE3-class TEFC motor, IP55 protection and Class F insulation are manufacturer-listed for these higher-flow models.
• Appropriate applications include water distribution, compatible irrigation systems, commercial washdown, cooling water and process-water transfer.

MH Series vs. BT4 Horizontal Multi-Stage Booster Pumps

If the installation demands more than 45 GPM nominal flow, the MH 70/90 line is worth comparing. If it requires particularly high discharge pressure at lower flow, examine the BT4 curves. A pressure switch or suitable controller may be needed for automatic operation; an MH pump alone is not a complete constant-pressure control system.

Franklin Electric MH OEM Repair Parts, Mechanical Seals and Stage Kits

Ken’s Distributing Company can help identify an MH replacement mechanical seal, shaft kit, casing, O-ring or hydraulic stage assembly. The manufacturer’s MH service manual provides the following reference numbers for the 15–45 GPM pumps. It uses shortened 15MH / 30MH / 45MH service-family designations; compare them with the full FMH nameplate model and pump revision before ordering. Parts availability is confirmed by quotation.

How Many Stage Assemblies Does an MH Pump Use?

The 15–45 GPM service manual calls for one discharge assembly, one suction assembly and a number of intermediate assemblies based on stage count.

Parts fitment example: A 30FMH2S5 is a 30 GPM, five-stage model. The manufacturer lists 305408910 for the corresponding shaft kit, 305408914 for the discharge stage, 305408919 for the intermediate stage family, and 305408922 for the suction stage. Confirm the exact serial or revision and component requirements before ordering; a five-stage assembly does not use the same quantities as a two-stage unit.

70–90 GPM Service Parts

The separate 70–90 GPM component drawing lists mechanical seal kit 14222054 with carbon/silicon-carbide faces and EPDM. It also identifies a floating neck ring, ball bearings, pump shaft, impellers and stage housings. Do not substitute the 15–45 GPM seal 305421906 based only on the MH family name.

Should You Replace the MH Pump or Repair It?

• Mechanical seal or minor leak: Identify the complete model, liquid temperature and seal number before requesting an OEM seal.
• Loss of pressure or worn stages: Review the performance curve, suction installation and stage assembly part numbers.
• Motor or shaft problem: Match the electrical supply, motor frame, number of stages and manufacturer item number before ordering.
• Damaged casing or a changed system duty: Compare the complete-pump replacement cost against a parts rebuild using the required GPM and TDH.

Get MH Booster Pump Price and Availability

For complete pumps: Send the required flow (GPM), total dynamic head (feet), inlet pressure, liquid temperature, motor phase and voltage, and selected model or manufacturer item number. For repair parts: Send the full nameplate model, item number if available, part number and a picture of the failed component. Ken’s Distributing Company will help confirm fit, price and availability for buyers across the United States and Canada.

Call 303-699-7845 or request an MH pump or parts quote.

Frequently Asked Questions

Which Franklin Electric MH Series booster pump is right for residential water pressure?

The 15 and 30 GPM series are starting points for many residential and light-commercial projects. Select the exact model by flow at the necessary total dynamic head rather than nominal GPM alone. Confirm the availability and installation of pressure controls if automatic operation is required.

What is the difference between 15, 30, 45, 70 and 90 GPM MH models?

They are distinct nominal hydraulic families. The 15–45 GPM group offers 1/2–2 HP single- and three-phase motors; the 70–90 GPM group uses 4–7.5 HP three-phase close-coupled assemblies. Pipe sizes, sealing and allowable liquid temperature also differ.

Does the MH pump need a separate automatic pressure controller?

For demand-based automatic on/off or constant-pressure control, a compatible pressure switch or control system must be specified. The pump itself should not be assumed to include a complete automatic controller.

Can the MH Series pump hot water?

Franklin lists up to 225°F for 15–45 GPM models. The published 70–90 GPM family catalog lists a 14–194°F liquid operating range; check the exact product revision and system conditions before choosing a higher-flow MH pump for hot liquid.

Is the Franklin Electric MH pump listed for potable water?

Franklin lists NSF/ANSI/CAN 372 for the 15–45 GPM group. That standard addresses lead content in drinking-water components; it does not replace checking all local potable-water system requirements. Confirm the specific model’s listing.

Can I buy an MH mechanical seal or individual impeller stage?

Yes, Franklin publishes separate OEM seals, shaft kits and hydraulic stage assemblies. The 15–45 GPM manual identifies seal 305421906, and the 70–90 GPM catalog lists seal kit 14222054. Send the exact nameplate and part information so the correct item can be quoted.

Is a 30FMH2S5 replacement the same as a 30FMH1S3?

No. They share a nominal 30 GPM family but have different horsepower, stage counts and performance curves. The correct replacement should match the required duty and original electrical and plumbing arrangement.

Related Franklin Electric Booster Pumps and Parts

• Franklin Electric BT4 Horizontal Multi-Stage Booster Pumps for high-pressure boosting and alternative hydraulic models.
• Franklin Electric Inline Controls Pressure Boosting System for compatible automatic control applications.
• Franklin Electric End Gun Booster Pump for irrigation pressure boosting.
• Franklin Electric OEM Replacement and Repair Parts for additional pump and component inquiries.