A.Y. McDonald DuraMAC vertical multistage variable speed booster systems — 69 factory-built models from 20 to 420 GPM with 56 to 150 psi of pressure added, for data centers, hotels, condominiums, hospitals and high-rise buildings.
Two control tiers. Micro covers 20 to 96 GPM on the Yaskawa iQpump micro drive. IQ1000 covers 80 to 420 GPM with lead-lag alternation, suction and discharge transducers, a fused disconnect and password-protected parameters — in simplex, duplex and triplex, with 460V three phase priced the same as 208-230V.
Built for commercial duty throughout: 304 stainless impellers and diffusers, 301 stainless casings, silicon carbide seal faces, a 304 stainless base, stainless manifolds, no-lead brass isolation valves and NEMA TEFC motors. Certified to NSF/ANSI/CAN 61 and NSF/ANSI 372.
Pre-packaged rather than fabricated, so lead time is typically one to four weeks instead of twelve or more. Systems arrive assembled, tested and pre-programmed to a 50 psi setpoint — a licensed plumber and a licensed electrician install it, and no factory startup visit is required.
All 68 factory submittals are on this page, grouped by pump type, so you can pull what you need for plan review before you order.
We are an authorized stocking A.Y. McDonald and Baker Water Systems distributor, holding DuraMAC in Houston for Gulf Coast delivery. Send design flow, required pressure, building height and available voltage and we will size it — 1-888.510.4036.
Vertical Multistage Variable Speed Booster Systems
Factory-built, pre-programmed constant-pressure booster packages from 20 to 420 GPM and up to 150 psi of boost — for data centers, hotels, condominiums, hospitals and high-rise buildings that need real pressure and cannot tolerate it swinging. Stocked in Houston, typically 1 to 4 weeks out.
20–420GPM
56–150 psiPressure Added
1-1/2–10 HPPer Pump
73Models In Stock Program
1–4 WeeksTypical Lead Time
Vertical multistage booster systems stack impeller stages to build high pressure in a small footprint, then put a variable frequency drive in front of the motor so the set holds one constant discharge pressure as demand rises and falls through the day. A fixed-speed booster cycles between cut-in and cut-out and every fixture in the building feels it. These hold the pressure steady — and because the pump only draws the power the load actually needs, they cost materially less to run at part load, which is most of the day in most buildings.
Five systems, seventy-three models, two control tiers. Micro covers 20 to 80 GPM on the Yaskawa iQpump micro drive. IQ1000 covers 80 to 420 GPM with lead-lag alternation, suction and discharge transducers and a fused disconnect. Every one ships factory-assembled on a stainless steel base, pre-programmed to a 50 psi setpoint you change from the keypad, with the factory submittal available below before you order.
Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor. We hold DuraMAC in Houston for Gulf Coast delivery. Call 1-888.510.4036 with your flow, pressure and building and we will size it. Genuine A.Y. McDonald equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Will It Work for Your Building?
The four questions that decide a booster purchase, answered before the detail.
Warranty
Covered for 1 year from the date of installation, or 2 years from the date of manufacture, whichever comes first, under A.Y. McDonald’s published limited warranty terms. Components made by other manufacturers, such as the Yaskawa drives and the motors, carry their original manufacturer’s warranty.
Reliability
A Yaskawa drive on every pump, 304 stainless impellers and diffusers, silicon carbide seal faces, NEMA TEFC motors and a 304 stainless base. The IQ1000 tier adds a low suction alarm, broken-pipe and over-demand monitors and Live Zero transducer protection; the Micro tier carries dry-run protection and sleep mode. Drives, pump ends, motors and seals are catalogued A.Y. McDonald parts.
Fit
20 to 420 GPM and 56 to 150 psi of pressure added. These run on a flooded, pressurized suction. A pressure tank is required and ordered separately: A.Y. McDonald’s minimum is 7.3 to 86 gallon by model. Voltage and phase are fixed by model, so confirm the service first.
Size It Now
Enter flow, pressure and inlet conditions and see which DuraMAC models cover the duty, then size the tank. Or send the numbers to sales@watermainsupply.com or call 1-888.510.4036.
Six things that decide this purchase, in the order buyers actually ask about them.
01 · Pre-Packaged, 1–4 Weeks Out
Complete factory-built systems — pumps, drives, manifolds, valves, transducers, gauges and enclosure assembled and wired on one stainless base. Typically one to four weeks, against the twelve or more a fabricated skid takes. There is no panel to build, no control sequence to write and no field assembly of components.
02 · Yaskawa Drives, A.Y. McDonald Since 1856
The drives are Yaskawa — iQpump micro on the Micro tier, IQ1000 on the commercial tier — not an unbranded controller nobody can service. Behind them is A.Y. McDonald Mfg. Co., making water-system products since 1856, through Baker Water Systems, established 1873. Replacement drives, pump ends, motors and seal kits are catalogued items, not special orders.
03 · Commercial-Duty Construction Throughout
304 stainless impellers and diffusers, 301 stainless casings, silicon carbide seal faces, a 304 stainless base that does not rust out under a wet plant room, stainless manifolds, brass no-lead isolation valves and NEMA TEFC motors. Every part in the water path and every part holding it up is specified for commercial service. See the full construction breakdown.
04 · No Factory Startup Visit Required
Systems arrive assembled, tested and pre-programmed to a 50 psi setpoint, changed in the field from the digital operator keypad. Installation needs a licensed plumber and a licensed electrician — and that is all. No commissioning engineer to schedule, no startup fee, no waiting on a factory tech to release the warranty.
05 · 20 to 420 GPM, up to 150 psi Added
One family covers a four-story walk-up and a 420 GPM high-rise riser. Eight pressure ratings from 56 to 150 psi of boost, in 208-230V single phase, 208-230V three phase and 460V three phase. If the duty point exists between those numbers, one of these seventy-three models lands on it.
06 · We Size It, Before You Buy It
Send fixture count, floors, inlet pressure and required flow and we come back with a sized selection, the pressure tank to go with it, the factory submittal and a lead time. Every model on this page has its curve data and published duty points on file. We would rather talk you out of the wrong machine than sell it to you.
Built for Commercial Duty — Part by Part
Plant rooms are wet, hot and rarely ventilated the way the drawing said they would be. Here is what each part of these systems is actually made of.
Component
Material / specification
Why it matters where these get installed
Impellers
304 stainless steel
The part doing the work, in the alloy that takes chlorinated potable water without pitting.
Diffuser
304 stainless steel
Stage passages stay dimensionally true, which is what holds the curve.
Pump casing, inlet & outlet
301 stainless steel
Pressure-containing parts in stainless, not cast iron that scales and weeps.
Liquid-filled gauges survive vibration. A suction transducer lets the control see a supply failure before the pump does.
Electrical
Fused disconnect (IQ1000 Duplex)
Disconnect at the skid, so service does not mean finding the panel.
Certification
NSF/ANSI/CAN 61 and NSF/ANSI 372
Two distinct marks — material safety in contact with drinking water, and lead content.
And when something does need attention, it is a part. A.Y. McDonald catalogues replacement drives by horsepower, phase and configuration, plus pump ends, NEMA motors, seal kits, transducer assemblies, gauges and check valves. A failed drive on these systems is a drive, not a new booster — which is the practical difference between commercial equipment and a packaged unit you throw away.
Component specifications from the A.Y. McDonald DuraMAC Vertical Multistage Variable Speed data sheets: IQ1000 Duplex 9/25, Simplex 9/25 and Micro Duplex. Where a feature is specific to one configuration it is named in the row.
Where These Systems Go
Buildings where the pressure has to be there, at the top floor, at 7 a.m., every day.
Building type
What makes it a fit
Where it usually lands
Data centers
Make-up water to cooling towers and humidification, on a service that cannot see a pressure dip. Redundancy is not optional.
Elevation is the whole problem — 0.433 psi for every foot up. 150 psi of boost covers roughly 340 ft of static lift before friction.
IQ1000 Simplex through Triplex, by riser flow.
Hotels
Demand swings from near zero overnight to every shower at once. Variable speed holds one pressure through both.
IQ1000 Duplex or Triplex.
Condominiums & apartments
Multi-unit draw, top-floor complaints, and an HOA that notices the power bill. Part-load efficiency is the argument that wins the board vote.
Micro Duplex to IQ1000 Duplex, by unit count.
Hospitals & medical
Potable and domestic hot water service where an outage is a serious event, and standby capacity has to be real.
IQ1000 Duplex or Triplex, sized so one pump carries the load.
Office, retail & light industrial
Steady daytime demand, modest flow, no room for a fabricated skid.
Micro Simplex or Micro Duplex.
Booster upgrades & retrofits
Replacing a fixed-speed set that short-cycles, hammers, or burns through seals. The footprint is smaller than what comes out.
Match the existing duty point, then step up a tier if the building has grown.
The Five Systems
Two control tiers, five configurations. What separates them is flow, pump count and how much control and redundancy comes with it.
Micro Simplex
Smallest footprint, full VFD
20 – 40 GPMFlow range
66 – 140 psiPressure added
1-1/2 – 3 HPMotor
10 modelsIn the program
One vertical multistage pump on a 304 stainless base with the Yaskawa iQpump micro drive, a liquid-filled gauge, a NEMA 1 enclosure and a discharge transducer. 1-1/4 in suction and discharge, roughly 26.6 in tall. The entry point into true constant-pressure control.
Best forSmall offices, retail, light industrial and constant-pressure upgrades where a fixed-speed set is short-cycling.
Two pumps and two drives on one 304 stainless base with 2 in NPT stainless manifolds. Double the flow of a single Micro at the same pressure, plus a pump in reserve — in a package that still fits a light-commercial plant room.
Best forLight industrial, process make-up water, and buildings that need a spare pump without stepping up to the commercial tier.
The commercial tier in single-pump form. Eight pressure ratings and three power configurations including 460V three phase, with the full IQ1000 protection set — low suction alarm, broken-pipe and over-demand monitors, Live Zero and password-protected parameters.
Best forMid-rise condominiums, offices and mid-size commercial buildings where one pump carries the load and the control has to be serious.
Two pumps and two drives, factory-assembled with 3 in flanged stainless manifolds, 2 in brass no-lead isolation valves, wafer check valves with soft seats, suction and discharge transducers and a fused disconnect. Lead-lag alternation shares run time across both pumps.
Best forHotels, 100-unit residential, data center make-up water and anywhere a pump has to be able to fail without taking the water out.
The largest DuraMAC package. Three pumps stage in and out as demand moves through the day, alternating which one leads so run time is shared evenly, and the set keeps the building in water with a pump out of service. 208-230V single phase, 208-230V three phase or 460V three phase, with 460V at the same price as 208-230V three phase.
Best forHigh-rise risers, hospitals, large hotels, data centers and any building whose draw swings widely between 7 a.m. and 2 p.m.
The deciding axis is peak flow. Find the row that carries your design demand, then check the pressure range covers what you are short.
System
Pumps
Max flow
Pressure added
Motor
Voltage & phase
Redundancy
Models
Micro Simplex
One
20–40 GPM
66–140 psi
1-1/2 – 3 HP
208-230V, 1Ph & 3Ph
None
10
Micro Duplex
Two
40–80 GPM
66–140 psi
2 × 1-1/2 – 3 HP
208-230V, 1Ph & 3Ph
Standby pump
10
IQ1000 Simplex
One
80–140 GPM
56–150 psi
3 – 10 HP
208-230V 1Ph/3Ph · 460V 3Ph
None
18
IQ1000 Duplex
Two, lead-lag
160–280 GPM
56–150 psi
2 × 3 – 10 HP
208-230V 1Ph/3Ph · 460V 3Ph
Either pump carries the building
17
IQ1000 Triplex
Three, staged
240–420 GPM
56–150 psi
3 × 3 – 10 HP
208-230V 1Ph/3Ph · 460V 3Ph
Runs with a pump out
18
Quick rule. Up to 80 GPM with no redundancy requirement, the Micro tier does the job in a smaller footprint for less money. Above 80 GPM, or anywhere a second pump has to be able to carry the building, go IQ1000 — and specify the pump count at purchase, because the configuration is set at the factory.
Micro vs IQ1000 — What the Tier Actually Buys You
Consideration
Micro tier
IQ1000 tier
Drive
Yaskawa iQpump micro, internal PLC
Yaskawa IQ1000
Flow range
20–80 GPM
80–420 GPM
Pressure added
66–140 psi
56–150 psi
Configurations
Simplex, Duplex
Simplex, Duplex, Triplex
Pump alternation
Duplex staging
Lead-lag alternation, equal run times across the set
Transducers
Discharge
Suction and discharge, plus backup system transducer
Protection
Sleep mode, sleep boost, auto restart, dry run
All of those, plus low suction alarm, broken-pipe and over-demand monitors, Live Zero transducer-fault protection
Parameter security
Keypad
Password-protected parameters, real-time clock
Electrical
NEMA 1 enclosure
NEMA 1 enclosure, fused disconnect (Duplex)
Manifolds
2 in NPT stainless (Duplex)
3 in flanged stainless (Duplex)
460V option
Not offered
Yes — at the same price as 208-230V three phase
Control and hardware detail from the A.Y. McDonald DuraMAC Vertical Multistage Variable Speed IQ1000 Duplex data sheet 9/25 and the Simplex / Duplex How It Works page 9/25. Lead-lag alternation, the backup transducer and the fused disconnect are published for the multiplex IQ1000 configurations.
DuraMAC vs the Other Packaged Boosters We Supply
The closest packaged variable-speed systems on our site, compared on the figures in their own listings.
DuraMAC vs DAB Esybox Max and Franklin Inline SpecPAK
DuraMAC Micro and IQ1000
DAB Esybox Max
Franklin Electric Inline SpecPAK
Pumps
Simplex, duplex or triplex, factory-built on one base
1 to 4 pumps, paired wirelessly on Esydock Max docks
Duplex, triplex or quadplex
Max flow
20–420 GPM
76.6 GPM per pump; 153 / 230 / 306 GPM with 2 / 3 / 4 pumps
90–300 GPM
Pressure
56–150 psi added at zero flow
Up to 315 ft (136 psi) on the multi-pump systems; 15–174 psi set point
70–100 psi max boost
HP per pump
1-1/2–10 HP
2.68–4.7 HP
1.5–3 HP
Power
208-230V 1Ph or 3Ph; 460V 3Ph on IQ1000
Single or three phase models
208-230V single phase; 480V service through a step-down transformer
Control
Yaskawa drive per pump; IQ1000 adds lead-lag, suction and discharge transducers, fused disconnect
Inverter in every pump, no external panel; Esy I/O module and Wi-Fi app
VFD per pump, factory PLC, 7 in color touchscreen, Modbus
Pressure tank
Required, ordered separately (7.3–86 gal minimum)
Included on Duplex (6 gal), Triplex (10 gal), Quadplex (21 gal)
Not specified on our listing
Warranty
1 yr from installation or 2 yr from manufacture
24 months from purchase
12 mo from installation or 24 mo from manufacture; 36 months with an approved commissioning checklist
Certification
NSF/ANSI/CAN 61 and 372
NSF 61/372, UL, CSA
NSF/ANSI/CAN 61 and 372; UL 508A panel
Verdict.DAB Esybox Max wins on footprint, on an included tank and I/O module on the Duplex, Triplex and Quadplex systems, and on a 24-month warranty; it is the stronger pick up to about 300 GPM where 136 psi is enough. Franklin Inline SpecPAK wins on floor space with its stacked design, on its touchscreen controller, and on a 36-month warranty once commissioning is approved; it tops out at 100 psi on single-phase power. DuraMAC wins on reach: up to 150 psi of boost, 420 GPM in one factory set, and 460V three-phase builds.
DuraMAC IQ1000 vs Grundfos Hydro Multi-E and Hydro Multi-B
DuraMAC IQ1000
Grundfos Hydro Multi-E
Grundfos Hydro Multi-B
Pumps
2 or 3 vertical multistage, Yaskawa drive per pump
2 or 3 Grundfos CRE vertical multistage, IE5 motor with integrated drive
2 or 3 Grundfos CME horizontal multistage, integrated drive
Lead-lag alternation; suction and discharge transducers; fused disconnect
Any pump takes over as master; two outlet sensors; optional BACnet, Modbus, PROFINET, EtherNet/IP
Duty alternation; suction-side pressure switch for dry-run protection
Size
Duplex 31 W x 46 D x 48 H in; triplex 44 W x 47 D x 49 H in
Duplex 34.6–44.8 W x 37.6–44.8 D x 30.7–44 H in
About 41 in tall
Efficiency rating
—
DOE PEI 0.38–0.45 on CRE 10–20 pumps
Not PEI-rated
Warranty
1 yr from installation or 2 yr from manufacture
Consumer purchases up to 30 months from manufacture; commercial per Grundfos terms
Consumer purchases up to 30 months from manufacture; commercial per Grundfos terms
Verdict. Grundfos Hydro Multi-E (Duplex, Triplex, CRE 3 and CRE 5) wins on top pressure at 205 psi, on building-management connectivity, on DOE PEI-rated pumps and on master failover with two outlet sensors: the pick where a data center or hospital needs the booster on the BMS. Grundfos Hydro Multi-B (Duplex, Triplex) wins on height, at about 41 in for low-ceiling rooms, and tops out at 105 psi. DuraMAC IQ1000 wins where the duty sits within 150 psi and the schedule is short: typically 1 to 4 weeks, stocked in Houston, with one A.Y. McDonald parts catalogue behind it.
Competitor figures are taken from our own product listings for each system, built from the manufacturers’ published data. Confirm against the current manufacturer documents before specifying.
Sizing & Best Practices
How we size these, and the two things that decide the fit more often than the curve does.
1. Calculate the boost you actually need
Required boost = target pressure at the highest fixture + 0.433 psi per foot of elevation + friction loss − inlet pressure. A twelve-story riser wanting 45 psi at the top fixture, 130 ft up, with 12 psi of friction and 55 psi at the main: 45 + 56.3 + 12 − 55 = 58 psi of boost. That is a 62 psi model with margin, not the 104 psi model somebody would have guessed at.
2. Estimate peak flow honestly
WSFU and Hunter’s curve (IPC Table 604.3) for residential occupancy; the IAPMO Water Demand Calculator for anything commercial — Hunter badly overstates demand on larger buildings, and an oversized booster is the most common reason a set gets replaced early. A hundred-unit condominium typically lands between 120 and 180 GPM, not the 300 a fixture-unit count suggests.
3. Size the pressure tank — yes, even on a VFD
A variable-speed booster still needs a pressure tank to stop it hunting at very low draw. A.Y. McDonald specifies the minimum per model: 7.3 gallon on the Micro Simplex, 14 to 20 gallon on the Micro Duplex, 20 to 36 gallon on the IQ1000 Simplex, 52 gallon on the IQ1000 Duplex and 52 to 86 gallon on the IQ1000 Triplex. On any system with a storage water heater a separate thermal expansion tank is still required at the heater.
4. Check the limits before the curve
Power: 208-230V single phase, 208-230V three phase and 460V three phase are separate models and are not field-convertible. Suction: vertical multistage pumps are not self-priming — plan a flooded, pressurized suction or a break tank with a transfer set. Total pressure: incoming plus added has to stay inside the system and casing ratings, and most codes cap building pressure at 80 psi at the fixture.
Sizing rule of thumb. If the duty point lands past 70 percent of a model’s maximum pressure at design flow, step up a model. A booster running at the far right of its curve runs at full speed continuously, which is where motors and seals wear out.
Every model is defined by two published figures: the pressure it adds at zero flow and its maximum flow. Read the rating in the model number: 17104V160Y-3 adds up to 104 psi and delivers up to 160 GPM.
Micro Tier
Max boost, 0 GPM
HP per pump
Simplex max flow
Duplex max flow
66 psi
2 HP
40 GPM
80 GPM
103 psi
1-1/2 HP
20 GPM
40 GPM
110 psi
3 HP
40 GPM
80 GPM
122 psi
3 HP
40 GPM
80 GPM
140 psi
2 HP
20 GPM
40 GPM
IQ1000 Tier
Max boost, 0 GPM
HP per pump
Simplex max flow
Duplex max flow
Triplex max flow
56 psi
5 HP
120 GPM
240 GPM
360 GPM
60 psi
5 HP
140 GPM
280 GPM
420 GPM
62 psi
3 HP
80 GPM
160 GPM
240 GPM
84 psi
5 HP
80 GPM
160 GPM
240 GPM
88 psi
7-1/2 HP
140 GPM
280 GPM
420 GPM
104 psi
5 HP
80 GPM
160 GPM
240 GPM
142 psi
10 HP
120 GPM
240 GPM
360 GPM
150 psi
7-1/2 HP
80 GPM
160 GPM
240 GPM
Pressure added is what the set adds on top of the pressure arriving at its inlet; zero flow is the shut-off point, a ceiling rather than a working point. Figures from the A.Y. McDonald model ratings and the Baker Water Systems DuraMAC Booster Pumps catalog, rev 3/26. Convert with 0.433 psi per foot of head. Each product page carries the full curve table by model; request the manufacturer curve or the factory submittal for plan review.
Which System Do You Need?
Selection by application. Call with fixture count, floors and inlet pressure for an engineering-led pick.
Application
Typical demand
Recommended
Notes
Small office or retail
20–40 GPM
Micro Simplex
Smallest footprint in the family. 208-230V, single or three phase.
Light industrial, process make-up
40–80 GPM
Micro Duplex
Two pumps, 2 in stainless manifolds, standby capacity.
Mid-rise condominium, 40–80 units
80–140 GPM
IQ1000 Simplex
Full IQ1000 protection set. Add a duplex where downtime is unacceptable.
Hotel or 100-unit residential
160–280 GPM
IQ1000 Duplex
Lead-lag alternation, 3 in flanged manifolds, fused disconnect.
Data center make-up water
160–420 GPM
IQ1000 Duplex or Triplex
Size so the set still meets demand with one pump out of service.
Hospital domestic service
240–420 GPM
IQ1000 Triplex
Three pumps staged; the set keeps running with one down.
High-rise riser, 12+ floors
any, to 420 GPM
IQ1000, 104–150 psi models
Elevation is the driver. 150 psi covers roughly 340 ft of static lift before friction.
Replacing a short-cycling fixed-speed set
match existing
Match duty, then step up a tier
Send us the old nameplate and we will cross it.
Factory Submittals — 68 Models
Every model with a published A.Y. McDonald factory submittal. Download what you need for plan review, permitting or a spec package — before you order, without asking anyone. Each button opens the submittal for that exact model number.
Reading a model number — 17104V160Y-3: series 17, 104 psi added at zero flow, V variable speed, 160 maximum GPM, Y Yaskawa drive, -1 single phase / -3 three phase at 208-230V / -34 three phase at 460V. Submittals for 17084V160Y-34 and the four single-phase triplex builds (17056V360Y-1, 17062V240Y-1, 17084V240Y-1, 17104V240Y-1) are requested from the factory on order; call 1-888.510.4036.
Accessories and Repair Parts
The tank every system needs, and the catalogued parts that keep it running.
Genuine A.Y. McDonald and Baker Water Systems parts, listed by A.Y. McDonald part number.
DuraMAC in Service
Two IQ1000 Duplex jobs we sized and supplied — one new building, one retrofit — and a Micro Duplex walkthrough.
Phoenix, AZ · New Residential Building · 17062V160Y-3
A new multi-unit building with a penthouse level had a 65–80 psi city main and needed 85 psi held at the booster discharge. The only space was an open corner beside the bike room. Two 3 HP pumps (60 GPM each at 104 ft, 160 GPM max, 62 psi added at shut-off) and a 52 gallon tank fit on one pad. The existing booster circuit only needed a 40 A breaker on #8 copper, the generator-backed panel sees soft starts only, and a normally closed bypass keeps water on during service.
Fort Myers, FL · 106-Room Hotel Retrofit · 17060V280Y-3
A four-story hotel was running a Canariis DS-200-27 fixed-speed duplex — two 5 HP motors starting across the line, rusted flex connectors and spring mounts, and an aging steel tank. Planned from the owner's photos, the new set (140 GPM per pump, 280 GPM system) matched the existing 208V, 10 HP service, so the disconnect, feeder and flanged stubs were reused. A 3 in bypass installed first kept the hotel in water through the swap, apart from two short tie-ins.
Left: before (Fort Myers) / installed (Phoenix). Right: the new set running. Send install photos or an old nameplate to sales@watermainsupply.com.
Video · Micro Duplex 17110V080Y-1 · Overview, Installation & Operation
Left: overview. Right: wiring, priming and setup. More on our YouTube channel.
Why Source These from Watermain Supply
Stocked in Houston
Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor. We hold DuraMAC in Houston in the correct US 60 Hz build — not an import variant that needs a transformer and an adapter.
Engineering-Led Selection
We have the published curve data and duty points for all 73 models on file. Send flow, pressure, floors and voltage and you get a sized selection, the tank to match, the submittal and a lead time — not a catalogue page.
Submittals Before You Order
Factory submittals for 68 models are on this page, ready for plan review without waiting on a rep to email a PDF.
Multi-Brand Perspective
If DuraMAC is not the right fit, we will say so and quote the one that is. We supply Grundfos, Davey, Goulds, Franklin Electric and DAB alongside it.
Account Terms Available
Net-30 for qualified contractor, property-management, general-contractor and municipal accounts.
Parts & Aftermarket
Replacement drives by horsepower and phase, pump ends, NEMA motors, seal kits, transducer assemblies and gauges — carried as catalogue items.
Frequently Asked Questions
The questions our technical desk answers most often on these systems.
What is the lead time?
Typically one to four weeks. These are pre-packaged factory-built systems rather than fabricated skids, which is where the difference comes from — a custom-built booster skid commonly runs twelve weeks or more. Call for a firm date against your model and configuration.
Do I need a factory startup or commissioning visit?
Systems arrive assembled, tested and pre-programmed with a 50 psi factory setpoint that is changed in the field from the digital operator keypad. Installation requires a licensed plumber and a licensed electrician, and the system goes into service without a startup visit.
Is the boost figure the pressure I will see at the fixture?
The boost figure is what the pump adds on top of what arrives at its inlet, measured at zero flow, so a 104 psi model on a 50 psi main is working from 50 psi up. Work from required boost = target pressure + 0.433 psi per foot of elevation + friction − inlet pressure, or send us the numbers and we will do it.
How much pressure do I need per floor?
0.433 psi per foot of static lift, so roughly 4.3 psi per ten-foot floor, before friction and before the pressure you want left at the top fixture. Twelve floors is about 52 psi of elevation alone. The 150 psi models cover roughly 340 ft of static lift before friction losses.
Can I add a second or third pump later?
The pump count is set at the factory: simplex, duplex and triplex are separate factory-built systems, and the configuration is chosen at purchase. If the building may grow, or if a pump has to be able to fail without taking the water out, specify the duplex or triplex now.
Do you have 460V three phase?
Yes, across the IQ1000 tier — simplex, duplex and triplex — carrying a “-34” suffix, and priced the same as the 208-230V three-phase model. The Micro tier is 208-230V only. Voltage and phase are not field-convertible, so confirm the service before ordering.
Do these need a pressure tank?
Yes. A variable-speed booster still hunts at very low draw without a tank to absorb it. A.Y. McDonald specifies a minimum per model, from 7.3 gallon on the Micro Simplex to 86 gallon on the largest IQ1000 Triplex. Use the pressure tank sizing calculator, and remember a separate thermal expansion tank is still required at any storage water heater.
Are these self-priming?
They run on a flooded, pressurized suction, as vertical multistage pumps do. Where the supply is a break tank below the pump, plan a transfer set or a flooded-suction arrangement; we will spec it with you.
What happens if the incoming supply fails?
The IQ1000 tier carries a low suction alarm that stops the pump if the incoming supply is interrupted, plus internal monitors that prevent running on a broken pipe or beyond capability, and Live Zero protection if a transducer cable is damaged. The Micro tier carries dry-run protection and sleep mode.
Can you help select the right model?
That is the part we are good at. Send fixture count or design flow, number of floors or static height, inlet pressure and available voltage to sales@watermainsupply.com or call 1-888.510.4036. You will get a sized selection with the submittal attached, and an honest note if a different brand fits better.
Let’s Spec Your Booster System
Send your design flow, required pressure, building height, available voltage and redundancy requirement. We will come back with a sized selection, the pressure tank to match, the factory submittal and a firm lead time.
Technical data on this page is taken from A.Y. McDonald and Baker Water Systems US 60 Hz product literature, and for the comparison tables from DAB, Grundfos and Franklin Electric product literature, and is subject to change by the manufacturer. Confirm against the current installation manual, submittal and pump curve before specifying. Lead times are typical and confirmed at order. A.Y. McDonald, DuraMAC, Baker Water Systems, Yaskawa, iQpump, DAB, Esybox, Grundfos, Hydro Multi-E, Hydro Multi-B, Franklin Electric, Inline SpecPAK, Davey and Goulds are trademarks of their respective owners, used here for product identification only. Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
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