Having problems with how to install a dishwasher? It does not need to be difficult. In a commercial kitchen, installation is not so much a DIY job as ensuring that plumbing, power, and compliance are in place. Here, we will take you through the installation process, who should do it, and the primary considerations that should be made before introducing a new unit to service.
Most business owners are concerned with leaks, power points, drain hoses, etc. Installing incorrectly can lead to downtime, compliance violations, or increased expenses.
At Industry Kitchens, we've worked with countless hospitality businesses, so we'll make sure that you get practical steps tailored to commercial needs. By the end, you can get straight back to service, knowing your dishwasher is installed and ready for action.
TL;DR: Install a Dishwasher the Right Way
Installing a commercial dishwasher involves preparation, licensed skills, and safety standards. The following are what hospitality businesses should know about the process:
Know whom to call: Licensed plumbers deal with water inlets, drain hoses and backflow prevention, and electricians deal with safe electrical connections.
Know what is needed: Commercial dishwashers should have compatible hot water, drainage, and electrical outlets (cuts cause leaks, dangers, and legal complications).
Balance in-house vs. pro work: The staff can do space preparation, unit movement, and testing checks; however, plumbing and electrical work should never be done by the staff.
Who Installs a Dishwasher?
Most commercial kitchens employ a licensed plumber and/or electrician to do the work.
A plumber will ensure that the water inlet, the drain hose, and the high loop backflow prevention are fitted correctly.
Safe connections are handled by an electrician, particularly when hardwiring or three-phase power is needed.
Some suppliers provide professional installation with your purchase, so always confirm what's covered before buying.
How long does it take to install?
The average time to replace an old dishwasher with a new one, including connecting the water supply line, is 1-2 hours. This procedure is fast if the space, plumbing, and power are ready. But it will take more time to install if the dishwasher needs to be cut down to the cabinet, rewired, or have the drainage changed.
Plumbing and Electricity Requirement
Plumbing: There should be a supply of hot water, a kitchen sink drainage outlet, and hose clamps. The drain hose should be high-looped to prevent dirty water from flowing back.
Electrical: You'll need a special outlet with a rating matching your dishwasher. If hardwiring is necessary, a qualified electrician can do the job.
DIY vs Professional Installation
Although installing a dishwasher yourself is technically possible, doing so without proper plumbing, electrical connections, and compliance can void the warranty and pose safety risks. That's why we do not recommend DIY for commercial kitchens.
Businesses usually employ a licensed plumber or electrician to install drainage and electrical systems. Many suppliers offer installation for free or at an extra fee, so it's important to check this upfront.
Here's why you need professionals for installing a dishwasher:
Avoids costly mistakes: One wrong connection and you're looking at leaks, water damage, or even electrical hazards. That's a headache that no busy kitchen needs.
Keeps things safe: These machines work on high water pressure and temperatures. A proper setup lowers the risk of accidents and keeps your staff protected.
Saves you money in the long run: DIY installation can save you money initially. However, fixing leaks or electrical issues later will cost you more. That's why doing it right the first time pays off.
Protects your warranty and compliance: Most manufacturers only cover professionally installed units, and pros ensure you meet local safety standards.
How to Install a Dishwasher (What You Can Prepare vs. When to Call a Professional)
Licensed plumbers and electricians usually handle all fixed plumbing and electrical work, while your team assists with simple tasks like unpacking, positioning the unit, and running test cycles. This balance helps maintain compliance and ensures your commercial dishwasher can perform reliably under daily, high-volume use.
1. Preparing the Space (In-House)
Before starting any installation, make sure the area is prepared:
Space: Allow enough room for the dishwasher's footprint and access to hoses, cords and drainage.
Proximity: The sink and water supply must be close to the unit to prevent expensive adjustments.
Safety: Switch off power and water before starting any work.
Your crew can check the space and confirm requirements, but do not alter plumbing or electrical outlets without a licensed expert.
2. Removing the Existing Dishwasher (In-House + Professional Support)
If replacing an old unit:
Staff can unplug the electric power at the wall and turn off the water supply.
Carefully slide out the old dishwasher, clean the cavity, and inspect for damage.
If pipes are corroded, fittings are old, or electrical disconnections require more than unplugging, leave it to the pros.
3. Positioning the New Unit (In-House)
Move the dishwasher into place and make sure that it's level and stable. Adjust feet and supports as needed to allow doors and access panels to open freely. This can be done in-house, although the heavy commercial units might need more than one employee to be safe.
4. Connecting the Water Line (Professional)
Dishwashers typically run on hot water for efficiency. A licensed plumber should:
Connect the dishwasher's water inlet to the appropriate valve.
Flush the water line before connecting to keep dirt and debris from entering the machine.
Fit hose clamps to prevent leaks.
5. Attaching the Drain Hose (Professional)
Attach the drain hose to the sink outlet or high loop standpipe to prevent dirty water from flowing back into the machine. This is a compliance-sensitive measure, so it is best left to a plumber who can ensure adequate drainage and backflow prevention.
6. Connecting Electrical Supply (Professional)
Commercial dishwashers usually require hardwiring or three-phase power. Only a licensed electrician should:
Ensure the outlet corresponds to the unit's power rating.
Install wiring safely and in line with regulations.
This protects your warranty and ensures compliance.
7. Testing the Installation (In-House + Professional Oversight)
Test the system after installation to make sure there are no leaks, the drainage is positioned correctly, and the power flow is appropriate. Your team members can observe noise levels, stability, and water behaviour. If problems occur, the installer should adjust levelling or hose connections.
8. Final Checks and Staff Handover (In-House)
After testing, ensure panels are refitted neatly. Train your team on:
How to start and stop the dishwasher.
Safe shutdown procedures in case of an issue.
When and how to disconnect power or water.
With these checks complete, your dishwasher is ready for daily service—efficient, safe, and compliant.
Conclusion
Not sure how to install a dishwasher in your venue? Follow these steps: clear the area (remove the old unit, if necessary), connect the new dishwasher to water, drainage, and power, and then test the unit to check for leaks or faults.
Some steps can be done in-house, but certified professionals are essential for plumbing and electrical compliance. With the proper setup, your dishwasher is ready for service.
At Industry Kitchens, installation isn't included unless quoted, but we can coordinate licensed technicians and commissioning to meet Australian Standards. Get in touch to ensure everything's ready before delivery.
Frequently Asked Questions
Is it possible to install a dishwasher myself?
Yes, but only if the space has the right plumbing, drainage, and electrical connections. In that case, you can manage parts of the job, like positioning the unit or running a test cycle. However, commercial dishwashers are much heavier and more complex than domestic models. Whether it's an undercounter, passthrough or conveyor machine, it still needs to be installed level, safe, and fully compliant. For anything beyond the basics, you'll need licensed professionals.
Do I need a plumber to fit a dishwasher?
If you're replacing an old dishwasher and the pipes are already working, you might not need a plumber. But you'll need a licensed plumber for new setups or when plumbing needs to be moved or fixed. In a commercial kitchen, it is important to meet Australian safety and health standards and to make sure the unit works properly without causing leaks or drainage problems later on.
What are the typical errors during the installation of dishwashers?
One of the most common mistakes is not levelling the machine properly, which can affect how well it runs. Another is forgetting to clamp the drain hose or flush the water line before connecting, which can lead to leaks or damage. Some people also connect the wrong power supply, especially for three-phase models. Even something small, like a door that doesn't close properly, can stop the dishwasher from running as it should.
How expensive is it to install a dishwasher?
The type of dishwasher and the amount of work required determine the price. Replacing an old unit with a new one in the same spot is usually the cheapest option. If plumbing or electrical points need to be moved or changed, or if you need to adjust cabinetry, the price will go up. Larger units like passthrough or conveyor dishwashers often cost more to install due to their size and connection needs.
Do all dishwashers need to be vented?
Not all commercial dishwashers need a special vent. Many undercounter models are fine as long as they're installed with a proper drain loop to prevent backflow. That said, larger units like passthrough or conveyor dishwashers often produce a lot of steam and may need a canopy or exhaust system. It's best to check the manufacturer's instructions and follow local codes to make sure everything is up to standard.
How heavy is a dishwasher?
It depends on the model. Undercounter dishwashers usually weigh between 50 and 80 kilos, while larger passthrough and conveyor units can weigh well over 100 kilos. Because of this, it's important to plan how you'll install it. You might need more than one person or special lifting gear, especially in tight or uneven kitchen areas.
Is a dishwasher using a lot of electricity?
Commercial dishwashers are built to be efficient, even with regular use. Nowadays, most models are made to conserve energy and water, especially when connected to a hot water source. That said, you still need to choose the right size for your kitchen and install it correctly to reduce long-term running costs. Always verify the dishwasher's Energy Star rating and water usage before buying.
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