What is a Dishwasher High Loop? – Essential Plumbing Tips
A dishwasher high loop is a method of routing the dishwasher drain hose in an upward arc to a point that is higher than the water level in the sink. This prevents contaminated water from the sink from backflowing into the dishwasher, ensuring sanitary operation and reducing the risk of water siphoning.
Understanding the Dishwasher High Loop
Definition of a High Loop in Dishwashers
A dishwasher high loop is a technique where the dishwasher’s drain hose is looped upwards and attached to the underside of the kitchen countertop before it connects to the sink drain or garbage disposal.
This design causes the hose to form a ‘high loop,’ which is the highest point in the drain system of the dishwasher.
Purpose of the High Loop
The primary purpose of a high loop is to prevent backflow or the siphoning of dirty water from the sink back into the dishwasher.
This is crucial for maintaining the hygiene of the dishes and the dishwasher itself. By having the loop, the drain line is elevated, which reduces the risk of contamination from sink water.
High Loop vs. Air Gap
While a high loop is one method of preventing backflow, an air gap is another.
An air gap is a small fixture installed on the countertop or sink that physically separates the end of the dishwasher drain hose from the garbage disposal or drain pipe.
This gap prevents any possibility of water flowing backward into the dishwasher. Although both serve the same purpose, local building codes might mandate one over the other.
Installing a Dishwasher High Loop
Typical Location for a High Loop
In most kitchens, the high loop is located at the back of the sink cabinet where the dishwasher drain hose is looped as high as possible just beneath the countertop before descending to connect to the sink’s plumbing.
Step-by-Step Guide on Creating a High Loop
Creating a high loop involves securing the dishwasher drain hose in an upward arc. Start by attaching the end of the hose to the dishwasher’s drain port.
Then route the hose upwards to the highest possible point beneath the countertop, and secure it in place. Ensure the hose has no kinks or bends that could restrict water flow. Finally, guide the hose downward to connect to the drain or disposal unit.
Building Codes and Manufacturer Recommendations
It’s important to consult local building codes and the dishwasher manufacturer’s guidelines when installing a high loop. Some areas have specific requirements for the high loop or may require an air gap instead.
Failure to comply with these codes might lead to improper installation and potential health risks.
Signs of Improper High Loop Installation
If water remains at the bottom of the dishwasher after a cycle, or if there are unpleasant odors, these could be signs that the high loop is not installed correctly.
It’s also possible that the hose is not elevated sufficiently or is slipping down over time, which would compromise its functionality.
Maintenance and Troubleshooting
Common Issues with Dishwasher High Loops
Over time, the high loop can become loose or the hose may develop kinks. Additionally, debris can accumulate in the hose, causing blockages that affect the dishwasher’s ability to drain properly.
Regular Maintenance Tips
To ensure the high loop continues to function optimally, regularly inspect the hose for secure attachment and look for signs of wear or damage. Clean the hose periodically to prevent clogs, and make sure no heavy objects are pressing against it.
Troubleshooting Drainage Issues
If the dishwasher isn’t draining properly, first check the high loop for slippage or blockages.
Verify that the hose is still secured at its highest point and that there are no kinks. If the hose appears clear and correctly positioned, the problem might be with the dishwasher itself or further down the drain system.
When to Call a Professional
If troubleshooting doesn’t resolve the issue, it may be time to call a professional.
Persistent odors, standing water, or a hose that repeatedly slips from its position are all indicators that professional help might be needed to ensure everything is installed and functioning as it should be.
FAQs About Dishwasher High Loop
What is the purpose of a dishwasher high loop?
The purpose of a dishwasher high loop is to prevent contaminated water from the sink from backflowing into the dishwasher and to reduce the risk of water siphoning, ensuring sanitary operation.
How high should the dishwasher high loop be installed?
The dishwasher high loop should be installed at a point that is higher than the water level in the sink, typically at least 18 to 20 inches above the dishwasher’s base.
Is a dishwasher high loop required by plumbing codes?
Plumbing codes in many areas require a dishwasher high loop or an air gap as a means to prevent backflow, but the specific requirements can vary by locality.
Can I install a dishwasher high loop myself?
Yes, many homeowners can install a dishwasher high loop themselves by following the dishwasher manufacturer’s instructions and local plumbing codes.
What is the difference between a dishwasher high loop and an air gap?
A dishwasher high loop is a simple upward routing of the drain hose, while an air gap is a physical device installed on the countertop or sink that ensures a direct path for backflowing water to the sink, offering more protection than a high loop.
Final Thoughts
The dishwasher high loop is a crucial design feature that involves routing the dishwasher’s drain hose upward to prevent backflow of contaminated sink water into the appliance.
This configuration is key for maintaining the hygiene of the dishwasher and protecting against water siphoning issues, thereby ensuring the appliance operates safely and effectively.
