How to Drain a Bunn Coffee Maker: Step-by-Step Guide

Every Bunn coffee maker is designed for years of reliable brewing, but even the best machine needs maintenance. One of the most important tasks is draining the unit. Whether you’re cleaning, storing, moving, or troubleshooting, knowing how to drain a Bunn coffee maker safely can prevent damage and extend its life. Many owners, even those who love their Bunn, are unsure how to do this right. If you’ve ever wondered about the right way to empty your machine or why it’s necessary, you’re in the right place.

Most coffee makers don’t hold much water inside, but Bunn machines are different. They have a hot water tank that always stays full when plugged in. This means that draining your Bunn is not as simple as just emptying the carafe.

Overlooking this step can lead to stale water, mineral buildup, or even damage during shipping. In this article, you’ll learn exactly how to drain your Bunn coffee maker, step by step, with expert tips and common mistakes to avoid. You’ll also discover why this process matters, and how to keep your machine in top condition for years.

Let’s get started with what you should know before you even reach for a screwdriver.

Why Draining Your Bunn Coffee Maker Matters

Many people think cleaning the outside and running water through the machine is enough. But with Bunn’s special design, water stays inside a hidden internal tank. This water can become stale or collect minerals over time. If you move your coffee maker with water inside, it could leak or get damaged.

You may need to drain your Bunn coffee maker if:

• You’re moving or shipping the machine.
• You plan to store it for a long time.
• You want to deep clean or descale the unit.
• You need to troubleshoot heating or taste issues.

Neglecting to drain can cause:

• Mineral buildup that clogs the unit.
• Bad odors or tastes from old water.
• Frozen water inside if stored in cold places.
• Electrical or heating problems if water leaks onto internal parts.

Draining is a key part of Bunn coffee maker maintenance. It only takes a few minutes, but it protects your investment.

Understanding The Bunn Coffee Maker’s Water System

Before you begin, it helps to understand how your Bunn works. Unlike drip brewers that only heat water as needed, most Bunn models keep a hot water reservoir inside. This keeps water ready for fast brewing, but it also means:

• Water remains inside even when the carafe is empty.
• The tank can hold up to 50 oz (about 1.5 liters), depending on the model.

The location and size of the tank may vary:

• Home models (like the Bunn Speed Brew or Velocity Brew) have a single tank.
• Commercial models (like the Bunn VPR, CW Series, or VP17) may have larger or multiple tanks.

Knowing your model makes draining easier. Check the manual or the label on the back of your machine if you’re unsure.

Safety Precautions Before You Start

Draining your Bunn coffee maker is safe if you follow simple steps. However, skipping safety can lead to burns or electric shock.

Follow these precautions:

• Unplug the machine: Never work on an appliance that’s plugged in.
• Let it cool: Wait at least 2 hours after turning off. The internal water is very hot.
• Clear the area: Keep kids and pets away. Hot water can cause burns.
• Have towels ready: Some water may spill.
• Use proper tools: You may need a flat-head screwdriver for some steps.

Never rush the process. Safety first, always.

What You’ll Need

Gather these items before you begin:

• Clean towels or rags
• A large bowl or container (at least 2 quarts/liters)
• Flat-head screwdriver (for some models)
• Dish soap (for cleaning afterward)
• Gloves (optional, for hot water or cleaning chemicals)
• The coffee maker’s manual (if available)

Having everything ready makes the job easier and cleaner.

Step-by-step Guide: How To Drain A Bunn Coffee Maker

Let’s walk through the complete process, from start to finish. The steps are similar for both home and commercial models, but there are some differences. This guide covers both.

Step 1: Power Down And Cool Off

• Turn off the coffee maker using the power switch.
• Unplug it from the wall.
• Wait at least 2 hours. Touch the outside—if it’s cool, it’s safe to continue.

Step 2: Remove The Brew Funnel And Carafe

• Take out the brew funnel (the part where you put coffee grounds).
• Remove the glass or thermal carafe.
• Set these aside for cleaning later.

Step 3: Access The Water Reservoir

For most home Bunn models:

• Open the top lid where you pour water.
• You may see a plastic disk or spray head—remove this gently if possible.

For commercial models:

• You may need to remove a top cover using a screwdriver.
• Be careful with any screws or small parts.

Step 4: Locate The Drain Plug (for Commercial Models)

Home models don’t usually have a separate drain plug. For commercial units:

• Look at the back or bottom for a small drain plug or screw.
• It’s often marked or described in your manual.
• Place a bowl underneath to catch water.

Step 5: Drain The Internal Tank

For home models:

• With the unit unplugged and cooled, tilt the coffee maker over a sink.
• Water will pour out from the spray head opening.
• Let it drain fully.

For commercial models:

• Remove the drain plug with a screwdriver (careful, some water may spray out at first).
• Allow all water to flow into the bowl.
• Replace the plug tightly after draining.

Step 6: Drain Remaining Water (optional But Recommended)

• Hold the unit upside down over a sink for a minute to remove extra water.
• Wipe up any spills with towels.

Step 7: Clean And Reassemble

• Wash the brew funnel and carafe with warm, soapy water.
• Wipe down the outside with a damp cloth.
• For tough stains, a little vinegar can help.
• Reinstall any removed parts, including the spray head or top cover.

Step 8: Test For Leaks

• If you plan to use the machine again soon, refill the reservoir and run a plain water brew cycle.
• Check underneath for leaks.
• If storing, leave the machine dry and unplugged.

Many people forget to check for leaks after draining. This is important, especially if you removed a drain plug.

Draining A Bunn Coffee Maker: Home Vs. Commercial Models

Different Bunn machines have different features. Here’s a quick look at the main differences in the draining process:

If you’re unsure about your model, check the label or look up the manual online.

Special Tips And Common Mistakes

Draining your Bunn is simple, but many people make small mistakes that cause problems later.

Tips For Best Results

• Drain every 3–6 months if you use hard water. This prevents mineral buildup.
• Always wait for the unit to cool. Hot water can be dangerous.
• If you plan to store the coffee maker, leave the lid open so the inside can dry.
• Use filtered water to reduce mineral deposits.

Common Mistakes To Avoid

• Forgetting to unplug the machine: This is a safety risk.
• Draining when the water is still hot: Wait at least 2 hours after turning off.
• Losing small parts: Keep screws and spray heads in a bowl while working.
• Not reinstalling the drain plug tightly: This can cause leaks next time you use it.
• Not cleaning after draining: Old coffee oils and minerals can stay behind.

Many beginners skip the final cleaning step, thinking draining is enough. But a quick wash now saves trouble later.

When Should You Drain Your Bunn Coffee Maker?

You don’t need to drain your Bunn every week, but there are clear times when it’s smart.

• Moving or shipping: Always drain before packing. Water inside can cause leaks or damage.
• Long-term storage: If not using for 2 weeks or more, drain it.
• Deep cleaning or descaling: Draining makes cleaning more effective.
• Strange tastes or odors: Old water can make coffee taste bad. Draining helps.
• After repairs or troubleshooting: Some fixes require an empty tank.

Neglecting these moments can shorten your machine’s life.

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How To Refill Your Bunn Coffee Maker After Draining

After draining, you’ll need to refill and prime your coffee maker before brewing again.

Refill Steps

• Set the coffee maker on a flat surface.
• Make sure all parts are reassembled.
• Fill the reservoir with cold, clean water.
• Plug in the machine and switch it on.
• Wait 15–20 minutes for the water to heat.
• Run a water-only brew cycle to flush the system.

This ensures your next cup tastes fresh and clean.

Advanced Troubleshooting: What If Water Won’t Drain?

Sometimes, you may find that no water comes out when you tilt or open the drain plug. This can happen due to:

• Clogs from mineral buildup
• Blocked spray head or reservoir
• Vacuum lock inside the tank

Here’s what to do:

• Double-check that the unit is unplugged and cooled.
• Remove the spray head and check for blockages.
• Use a thin, non-metal stick to gently clear any debris.
• Try tilting the machine again.
• For commercial models, check the drain plug for scale.

If water still won’t drain, consider using a descaling solution or contacting Bunn customer support.

How Often Should You Drain And Clean Your Coffee Maker?

Draining is not a daily task, but regular maintenance helps. Here are some guidelines:

Hard water areas need more frequent draining due to mineral content. If you notice white scale or slow brewing, it’s time to drain and descale.

Draining And Descaling: Why Both Matter

Draining removes standing water, but it does not clean out mineral deposits (scale) inside the tank. For best results:

• Drain the machine first.
• Then run a descaling cycle (using vinegar or a commercial cleaner).
• Rinse thoroughly before brewing coffee again.

This keeps your machine fast, efficient, and safe from clogs.

Non-obvious Insights Most Beginners Miss

• Water left inside the tank can cause mold or bacteria growth, even if you don’t use the machine often. Draining prevents this, especially in humid areas.
• Many leaks in Bunn coffee makers are due to loose or missing drain plugs after draining. Always double-check the plug or seal before refilling.
• Using very hot water to clean or rinse may cause plastic parts to warp or seals to weaken. Stick to warm (not boiling) water.
• The taste of your coffee improves after draining and cleaning, as old water can pick up plastic or metal flavors over time.

Should You Call A Professional?

Most people can drain a Bunn coffee maker at home. However, if you notice:

• Persistent leaks after draining and refilling
• No water flow, even after clearing blockages
• Strange noises or smells after draining

It’s best to contact Bunn support or a licensed repair technician. Sometimes, internal seals or electrical parts need expert care.

Draining For Storage Vs. Draining For Cleaning

The reason you’re draining makes a difference in how thorough you should be.

• For storage: Drain all water, dry inside, and leave the lid open so air can circulate.
• For cleaning: Drain, descale, then rinse several times with fresh water.
• For moving: Drain, wipe dry, and secure loose parts (like carafe or funnel) separately.

Always label the machine as “drained” if someone else will handle it later.

Environmental Impact: Why Draining Helps

It’s easy to overlook, but draining and cleaning your Bunn coffee maker can actually save energy and resources:

• A clean, scale-free tank heats water faster, using less power.
• Proper maintenance helps the machine last longer, reducing electronic waste.
• Less mineral buildup means fewer repairs and less need for replacement parts.

This small task helps both your wallet and the environment.

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Comparing Bunn Models: Which Are Easiest To Drain?

Some Bunn machines are designed for easier maintenance. Here’s how a few popular models compare:

If you plan to buy a Bunn and want easy maintenance, home models are simpler to drain than commercial ones.

Where To Find Official Help

If you need more information, Bunn’s official manuals are very helpful. You can find them on the company’s website or by searching your model number. For reliable information, check this Bunn Product Manuals page.

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Frequently Asked Questions

How Long Does It Take To Drain A Bunn Coffee Maker?

Most home models take about 5–10 minutes to drain completely. Commercial models with larger tanks may need up to 20 minutes. Always add extra time to let the machine cool first.

Can I Drain My Bunn Coffee Maker Without Unplugging It?

No. Always unplug the machine before draining. This prevents electrical shock and protects the heating element from damage.

Do I Need To Drain My Bunn Coffee Maker Before Cleaning?

Yes. Draining removes old water and makes cleaning more effective. It also prevents spills and ensures descaling solutions reach all parts of the tank.

What Happens If I Don’t Drain My Coffee Maker Before Moving Or Storage?

Water left inside can leak, causing damage to the machine and surrounding items. In cold conditions, it can freeze and crack the tank. Always drain before moving or storing.

How Do I Know If My Bunn Coffee Maker Has A Drain Plug?

Check the back or bottom of the unit for a small plug or screw, or consult the manual. Most commercial models have a drain plug; most home models do not.

Draining your Bunn coffee maker is simple, but it’s one of the most important things you can do for your machine’s health. With regular care, your Bunn will deliver fast, delicious coffee for years. A little effort now prevents bigger problems later—so make draining part of your maintenance routine.