What Size Pipe For Washing Machine Drain?

The wrong size of pipe can be harmful to a washing machine.

A drain pipe and two hoses that link to the hot and cold water supplies are attached to a washing machine.

Although pipe widths are typically standard, each jurisdiction’s construction and plumbing rules may have particular specifications.

So, read this article to know the correct size pipe for the washing machine drain. 

What Size Pipe Do You Require For Your Washing Machine Drain?

For a washing machine, the recommended drain pipe size is 1 1/2 inches. This provides sufficient water flow to handle the volume from the washer. Building codes often require a minimum 1 1/2 inch drain pipe size for washing machines. The pipe material should withstand hot wastewater over 180°F.

Washing Machine Drain Pipe Size Chart:

Capacity	Size
Minimum	1 ½ inches
Common	½ to 1 inches
Standard	2 inches

Different Types of Pipes Suitable for Washing Machine Drains

PVC Pipes

PVC pipes are common for washing machine drains. They are white or grey. Let’s see why people use them:

1. Affordable. PVC pipes don’t cost much.
2. Easy to Work With. You can cut and fit them without much trouble.
3. Resistant to Rust. Water won’t make them rusty.
4. Lightweight. Carrying and installing them is easy.
5. Safety Tip: Always check for the right size.

ABS (Acrylonitrile Butadiene Styrene) Pipes

ABS pipes are similar to PVC but are black. Here’s what sets them apart:

1. Durable. These pipes can take a hit and not break.
2. Quick Installation. You don’t need strong adhesives.
3. Cold Resistant. Cold weather won’t crack them.
4. Smooth Interior. Less chance for clogs inside.
5. Safety Tip: They handle waste water well.

Copper Pipes

Copper pipes are shiny and reddish-brown. They’re a classic choice. Here’s why:

1. Long-lasting. They can last for decades without issues.
2. Resistant to Bacteria. Germs don’t grow easily in them.
3. No Rust. Water doesn’t make them corrode.
4. Safety Tip: Ensure joints are well-sealed.

Galvanized Steel Pipes

Galvanized steel pipes have a protective zinc layer. They’re sturdy but less common for washing machines. Let’s see why:

1. Tough. They can handle high pressures.
2. Rust-resistant. The zinc coating stops rust.
3. Safety Tip: Check them regularly for any wear.
4. Heavy. They’re bulkier than other pipes.
5. Lifespan: With good care, they last long.

How To Install The Right Size Pipe For Washing Machine Drain?

You might be unsure how to correctly install the drain line if you’re getting a new washing machine installed in your house. 

• To determine how much pipe you need, measure the drain line length in the first step.

• After that, use a hacksaw to trim the PVC pipe to size. Use a typical PVC connection to join the two pieces of line if you’re using a 1-inch pipe.

• Use a PVC coupler to connect the pipe’s cut-to-size end to the washing machine drain outlet. The central drain line in your home should be linked to the pipe’s opposite end.

• To finish the installation, you must rope in a drain trap and put it in a washing machine standpipe.

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How To Select The Right Size Pipe For Washing Machine Drain?

When the laundry room is on the main floor of the house, choosing a suitable pair of washing machine hoses is crucial.

As part of your routine plumbing maintenance, it’s a good idea to inspect the hoses for damage or leaks once a year.

Reinforced Rubber

The typical rubber-reinforced washing machine hose is well-known to many people. A mesh made of braided rayon or polyester serves as reinforcement.

Hoses available are not reinforced, so be sure the label specifies they are supported.

These hoses are not advised if your washing machine is inside the home since they are most likely to explode.

Steel Braided

A braided stainless steel hose is the bare minimum advised for interior use.

Although they are priced in the middle, the extra money is worthwhile for the increased safety.

A rubber hose is enclosed with stainless steel braid as a burst-resistant safety precaution.

When placed correctly, these hoses fail less frequently than rubber hoses do.

Auto-Shutoff Hose 

Auto-shutoff hoses can provide more peace of mind for a few extra bucks. Stainless steel-braided hoses are also suitable for indoor usage.

These hoses incorporate a shut-off mechanism at one end. The connection detects a change in water pressure caused by a ruptured hose and shuts off the water supply.

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Factors Influencing Washing Machine Drain Pipe Selection

Type of Washing Machine

The type of washing machine impacts drainage needs. Consider:

• Front Load: Require a drain near the floor. Tend to use less water.
• Top Load: Drain higher up on the appliance. Use more water.
• High Efficiency: Designed for lower water volumes.

Machine’s Water Discharge Rate

Know the machine’s gallons per cycle to size the drain for max discharge. Higher discharge needs bigger pipes.

Length of the Drain Pipe

Longer pipe runs need wider diameters to offset drainage slowing. Factor in full path to main drain line.

Local Building and Plumbing Codes

Check codes for minimum pipe size standards. Follow all specifications.

Existing Plumbing System Compatibility

Evaluate current system layout and capacity. Upgrade undersized or outdated drain lines as needed.

Pipe Material and Durability

Select pipe material capable of high heat effluent. PVC works well. Ensure durability.

Risk of Clogging and Backup

Larger pipes reduce clog risks from lint and debris. Consider ease of access for cleaning.

Environmental Considerations

Choose sustainable or recyclable materials. Check regulations on effluent.

How To Maintain The Right Size Pipe For Washing Machine Drain?

The first step in preventing hose failure and flooding is proper installation.

Use these installation and maintenance suggestions to help you avoid costly water damage.

Follow these easy guidelines to keep your washing machine hoses in good condition:

• Regularly inspect them to ensure they aren’t twisted, damaged, or corroding.

• Every three to five years, replace the hoses on your washing machine.

• Install a water hammer arrestor, which absorbs the impact of water once the washing machine cycle is complete and lowers the pressure in the hose.

• Turn off the water supply to washing machines while not in use.

• When installing a washing machine or repairing worn-out hoses, get the correct length of hoses.

• Provide enough distance between the wall and the machine to prevent hose kinks.

• Check the hoses at least once or twice a year.

• Think about investing in a reliable washer leak detection system.

• Hose breakdown may partly be caused by the continual water pressure on the washing machine hoses.

• Please read the manufacturer’s instructions before installing new hoses, then follow them.

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FAQs About The Right Size Pipe For Washing Machine Drain

The Final Words

You now have advice on what size pipe for the washing machine drain and how to handle any potential overflow issues in the future.

You may be sure to avoid casual errors that would otherwise hamper your washing machine by taking the above-described methods.

Call a professional plumber if you are not an expert do-it-yourselfer and are unsure that you can install a drain pipe properly.