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When you're tackling plumbing work—whether it's cutting through copper pipes, PVC, cast iron, or even lumber for rough-ins—having the right cordless saw can make the difference between a clean, fast job and a frustrating, time-consuming mess. Traditional corded saws are powerful, but they tether you to an outlet, which is rarely convenient in a crawlspace, under a sink, or on a new construction site. Cordless saws offer unmatched mobility, and modern lithium-ion batteries like Milwaukee's REDLITHIUM technology deliver the runtime and torque needed for professional-grade cuts.

In this guide, we compare three types of cordless saws essential for plumbing work: reciprocating saws (often called Sawzalls), Hackzall compact reciprocating saws, and circular saws. We'll break down their strengths, ideal use cases, and help you choose the best tool for your specific plumbing projects. Along the way, we'll highlight top Milwaukee models available at Acmetoolsdiscount, including the M18 FUEL 18-Volt Lithium Ion Brushless Cordless 1/4 in. Hex Impact Driver with (2) M18 5.0Ah Batteries—a versatile driver that pairs perfectly with a saw setup—and the M12 12-Volt Lithium-Ion Cordless Soldering Iron (Tool-Only), ideal for finishing pipe joints after cutting.

Why Cordless Saws Are Essential for Plumbing

Plumbing involves cutting a variety of materials: copper, PVC, ABS, PEX, cast iron, and sometimes even steel or wood studs. Each material requires a specific blade type and saw style for optimal results. A cordless saw gives you the freedom to move around a job site without dragging extension cords, which is especially critical in tight spaces like basements, attics, or behind walls.

Milwaukee's M18 and M12 platforms offer a wide range of cordless saws designed for plumbing professionals and DIY enthusiasts alike. The key factors to consider are power (voltage and amp-hours), blade speed, stroke length, and ergonomics. Let's dive into the three main categories.

Reciprocating Saws (Sawzall) for Plumbing

Reciprocating saws, commonly known by the trademarked name Sawzall, are the workhorses of the plumbing world. They use a push-pull motion to cut through almost anything, from wood to metal to plastic. For plumbing, a reciprocating saw is invaluable for demolition work—cutting out old pipes, removing studs, or opening up walls.

Best Uses in Plumbing

• Cutting cast iron pipes: With a carbide-grit blade, a reciprocating saw can slice through cast iron soil pipes quickly.
• Demolition: Removing old cabinets, drywall, or studs to access plumbing.
• Cutting copper and PVC: Using a fine-tooth metal blade or a plastic-cutting blade, you get clean, burr-free cuts.

Milwaukee Models to Consider

Milwaukee offers several reciprocating saw models in the M18 lineup, including the M18 FUEL Sawzall with a brushless motor for maximum power and runtime. Features like variable speed trigger, orbital action, and a tool-free blade clamp make these saws versatile and easy to use. For most plumbing tasks, an 18V model provides ample power. If you need a lighter option for overhead work, the M12 Hackzall (covered in the next section) is a better fit.

Hackzall Compact Reciprocating Saws: The Plumber's Best Friend

The Hackzall is Milwaukee's compact reciprocating saw, designed for one-handed operation. It's smaller, lighter, and easier to maneuver than a full-size Sawzall, making it ideal for cutting pipes in tight spaces—like inside a wall cavity or under a sink. The Hackzall uses the same reciprocating motion but with a shorter stroke length, which reduces vibration and allows for more precise cuts.

Advantages Over Full-Size Reciprocating Saws

• Maneuverability: You can hold it with one hand, freeing the other to steady the pipe.
• Less vibration: Easier on your hands and arms during extended use.
• Faster blade changes: Many models have a tool-free blade release.

For plumbing, the Hackzall excels at cutting copper and PVC in tight spots. It's also great for cutting PEX tubing, though a dedicated PEX cutter is often faster. When paired with a high-quality battery like the M18 5.0Ah, a Hackzall can handle dozens of cuts on a single charge.

Circular Saws for Plumbing: When You Need Straight, Clean Cuts

Circular saws are typically associated with woodworking, but they have specific plumbing applications. For example, when cutting large-diameter PVC or ABS pipes (like 4-inch sewer lines), a circular saw with a fine-tooth blade can produce a straighter, cleaner cut than a reciprocating saw. They're also useful for cutting plywood or OSB sheathing during rough-in work.

Best Uses in Plumbing

• Cutting large PVC/ABS pipes: A circular saw provides a square, burr-free cut, which is critical for solvent welding joints.
• Cutting lumber: Framing out a bathroom or utility room, cutting studs for pipe runs.
• Cutting metal conduit: With an abrasive blade, you can cut EMT or rigid conduit.

Milwaukee's M18 FUEL circular saws are top-tier, offering brushless motors, magnesium shoe, and high torque for cutting through dense materials. For plumbing, a 6-1/2-inch or 7-1/4-inch model is ideal. However, for most pipe cutting, a reciprocating saw or Hackzall is more versatile.

Key Factors to Consider When Choosing a Cordless Saw for Plumbing

Before making a purchase, consider these factors:

Battery Platform

Milwaukee's M18 and M12 systems are both excellent. M18 offers higher power and longer runtime, suitable for heavy-duty cutting. M12 is lighter and more compact, perfect for precision work in tight spaces. If you already own Milwaukee tools, stick with the same battery platform to share batteries across tools. For example, the M12 12-Volt Lithium-Ion Cordless Soldering Iron Kit with (1) 1.5Ah Batteries, Charger & Hard Case uses the same M12 batteries as a Hackzall, making it a great addition to your plumbing kit.

Blade Selection

• For metal pipes (copper, steel, cast iron): Use bi-metal blades with 14-24 TPI (teeth per inch). Carbide-grit blades are best for cast iron.
• For plastic pipes (PVC, ABS, PEX): Use plastic-cutting blades with 6-10 TPI to avoid melting the material.
• For wood: Use wood-cutting blades with 6-8 TPI for fast cuts.

Stroke Length and Speed

Longer stroke lengths (1-1/4 inches) cut faster but produce more vibration. Shorter strokes (1/2 to 3/4 inches) are smoother and better for precision. Variable speed triggers let you adjust the pace based on the material.

Milwaukee Sawzall vs. Hackzall: Which Is Better for Plumbing?

This is a common debate among plumbers. Here's a quick comparison:

For most plumbing tasks, a Hackzall is the better choice due to its portability and precision. However, if you frequently cut cast iron or do heavy demolition, a full-size Sawzall is indispensable. Many professionals own both.

How to Use a Cordless Saw Safely for Plumbing

Safety is paramount when cutting pipes. Always wear safety glasses, gloves, and hearing protection. Secure the pipe with a clamp or vise before cutting to prevent kickback. Use the correct blade for the material—using a wood blade on metal can cause the blade to shatter. Finally, keep the saw's shoe flush against the pipe for stability and control.

Conclusion and Recommendations

Choosing the best cordless saw for plumbing depends on your specific needs. For a versatile, all-around tool that handles most pipe cutting and demolition, a Milwaukee Hackzall is hard to beat. If you need raw power for heavy-duty work, a full-size Sawzall is the way to go. For straight, clean cuts on large-diameter pipes, a circular saw is a valuable addition.

At Acmetoolsdiscount, you'll find a wide selection of Milwaukee cordless saws, batteries, and accessories to build the perfect plumbing toolkit. To get started, explore the M18 FUEL 18-Volt Lithium Ion Brushless Cordless 1/4 in. Hex Impact Driver with (2) M18 5.0Ah Batteries—not a saw, but the batteries it comes with will power your M18 saws and other tools, making it a smart investment for any plumber.