The IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP is a heavy‑duty, electric barrel mixer engineered for professionals who need a high‑capacity, low‑noise mixer for mortar, stucco, grout, or concrete while still running on standard household power. It combines a 12 cubic foot steel drum, approximately 9.5 cubic feet of batch output, and a powerful 120V single‑phase motor in a portable, non‑towable design that is ideal for contractors, remodelers, and rental fleets.

What Is the IMER Multi‑Mix 350 (Syntesi)?

The IMER Multi‑Mix 350 (Syntesi) is IMER’s flagship portable barrel mixer, positioned as the “big brother” to the Minuteman II and Wheelman II mixers. It is a 12CF, steel‑drum mixer designed to solve common problems seen in traditional belt‑drive concrete mixers by using a gearbox‑driven transmission housed inside the arm and a worm‑screw tilting system. This design makes the mixer quieter, more reliable, and easier to tilt while still being sturdy enough for daily jobsite use.

The “Syntesi” designation refers to IMER’s silent, gear‑drive mixer family, which prioritizes low noise, reduced maintenance, and high reliability compared to conventional belt‑driven drums. In the Multi‑Mix 350 configuration, that technology is paired with a 120V, single‑phase motor rated around 1.9 HP (commonly listed as 1.5–2 HP depending on the vendor), delivering strong mixing power from a standard electrical outlet.

Key Specifications: Capacity, Power, and Dimensions

The IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP is built around a generous 12 cubic foot drum that provides large batch productivity without moving up to towable mixers.

• Drum capacity: 12 cu ft.

• Batch output: approximately 9.5 cu ft per mix.

• Motor rating: 1.9 HP, 120V (often listed as 1.5–2 HP, 110–120V single phase).

• Power type: 120V single‑phase electric, industrial‑grade motor with oil‑bath gear drive.

• Drum diameter: about 32.5–34.75 inches, depending on source.

• Weight: approximately 385 lbs (about 175 kg).

• Wheels: 15" pneumatic wheels for easy movement.

These specifications make the mixer a strong choice for medium to large jobs where 9+ cubic feet per batch dramatically improves productivity over small portable units.

Electric Motor and Gearbox Drive

A core advantage of the IMER Multi‑Mix 350 (Syntesi) is its powerful 120V single‑phase motor and sealed gearbox drive system.

• The mixer uses a 1.9 HP 110–120V industrial‑grade electric motor designed for continuous duty on job sites.

• Power is transferred through a direct‑drive gearbox in an oil bath rather than exposed belts, resulting in “whisper quiet” operation and virtually no belt maintenance.

• The transmission system is inserted in the arm, protecting the drive and contributing to the mixer’s low noise and reliability.

This design reduces common failures associated with belt slippage, misalignment, or breakage and keeps the mixer working consistently across demanding projects. For contractors working in residential neighborhoods, indoors, or noise‑sensitive sites, the quiet operation is a significant advantage.

Drum, Paddles, and Mixing Performance

The IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP features a heavy‑duty steel drum with internal geometry optimized for fast, complete mixing.

• The 12CF steel drum delivers about 9.5CF of usable output, leaving enough freeboard for effective mixing action.

• Aggressive mixing paddles are designed to thoroughly shear and blend materials, reducing unmixed pockets and speeding up mix times.

• Some configurations include internal “domes” or baffles that push material back into the paddles, improving homogeneity.

The mixer is suitable for:

• Concrete mixes with aggregate.

• Mortar for block and brick.

• Stucco and plaster.

• Grout and other construction mixes.

By combining a large drum, aggressive paddles, and a strong electric motor, the Multi‑Mix 350 is built to handle a wide variety of job‑site materials with consistent, repeatable results.

Syntesi Design: Quiet, Reliable, and Low‑Maintenance

The “Syntesi” design philosophy focuses on durability, noise reduction, and ease of maintenance. Compared to belt‑driven, open‑frame mixers, the IMER Multi‑Mix 350 offers several important benefits:

• Gearbox transmission in an oil bath dramatically reduces wear and eliminates the need for belt tensioning and replacement.

• Direct drive to the drum increases torque delivery and reduces power loss.

• Noise levels are significantly lower, making it easier to work in urban or interior environments where noise regulations or comfort are concerns.

These features help the mixer outlast many traditional mixers while keeping maintenance simple—primarily limited to periodic inspections, lubrication of non‑sealed components, and standard electric motor checks.

Ergonomics, Safety, and Handling

The IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP is engineered to be easy to move, position, and operate.

Key ergonomic and safety features include:

• Posi‑Lock auto locking/unlocking dump wheel that allows the operator to stop and lock the drum at virtually any angle when discharging.

• Worm screw tilting system, which makes tilting the full drum smoother and requires less effort to control the pour.

• 15" pneumatic wheels for rolling the mixer around the jobsite, even on uneven terrain.

• Slide‑out transport bar and integrated forklift pockets to make loading, unloading, and repositioning with equipment simple and safe.

These features mean one or two workers can easily reposition the mixer and discharge into wheelbarrows, buckets, or forms with precision.

Typical Applications and Ideal Users

Thanks to its capacity and 120V power requirement, the IMER Multi‑Mix 350 (Syntesi) is a versatile choice in many construction scenarios.

Typical applications:

• Residential and light commercial concrete work.

• Masonry jobs requiring repeated mortar or grout batches.

• Stucco and plaster for exterior and interior finishes.

• Decorative concrete and floor underlayment mixing.

Ideal users include:

• General contractors and remodelers who need more output than small mixers but want to avoid towable gas units.

• Masonry and stucco contractors working on mid‑size to larger projects.

• Rental yards that require durable, simple, and low‑maintenance electric mixers for a range of customers.

With its large batch output and standard 120V motor, the Multi‑Mix 350 fits jobs where power is available but gas engines are undesirable due to fumes, noise, or maintenance.

Differences Between Multi‑Mix 350 and Other IMER Mixers

IMER offers several portable mixers, and the Multi‑Mix 350 (Syntesi) sits at the top end of the portable, non‑towable range.

• Compared to the Minuteman II and Wheelman II, the Multi‑Mix 350 has a significantly larger drum (12CF vs smaller capacities) and higher batch output, making it more appropriate for larger pours.

• Unlike many small 120V mixers, the Multi‑Mix 350 uses an industrial‑grade 1.9 HP motor and an oil‑bath gearbox for higher torque and durability.

• Against traditional belt‑driven mixers of similar size, the Syntesi design reduces noise and long‑term maintenance while offering comparable or greater mixing performance.

For buyers comparing multiple models, the IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP stands out by combining large capacity, quiet electric power, and gear‑drive reliability in a single package.

What’s Included with the Multi‑Mix 350

Typical Multi‑Mix 350 packages include everything needed for immediate use on a jobsite.

Standard equipment often includes:

• 1.9 HP 110–120V industrial‑grade motor with oil‑bath gear drive.

• 12 cu ft steel drum with approximately 9.5 cu ft output.

• Aggressive mixing paddles installed inside the drum.

• 15" pneumatic wheels.

• Slide‑out transport bar and forklift pockets for easy handling.

• Posi‑Lock dump wheel and worm‑screw tilting system.

Some distributors may include additional accessories or offer bundled pricing, so it is worth checking the specific listing or product sheet.

Why Choose the IMER MULTI-MIX 350 (SYNTESI) – Portable 12CF Mixer – 120V, Single Phase 1.9 HP?

Choosing this mixer provides a balance of power, capacity, quiet operation, and portability that is hard to match in 120V electric equipment.

Key reasons to choose it:

• Large batch capacity for serious jobs while still running on standard 120V power.

• Quiet, low‑maintenance gearbox design that reduces downtime and service costs.

• Strong, industrial‑grade motor with plenty of torque for concrete, mortar, stucco, and grout.

• User‑friendly features like Posi‑Lock dump wheel, worm‑screw tilt, and large pneumatic wheels.

• Rugged construction and steel drum designed for years of job‑site use, ideal for professionals and rental fleets.