Pressure washing can be a game-changer when it comes to cleaning stubborn dirt and grime from outdoor surfaces. But to get the job done right, you need the proper equipment—including an adequately sized water tank for your pressure washer. If you’re tackling pressure washing yourself, choose the right size water tank to get the job done efficiently and effectively.
This guide will walk you through everything you need to know about choosing the right size water tank for your pressure-washing needs. From understanding tank sizes and how they impact pressure to tips on using your equipment properly, we’ll cover all the bases to help you make an informed decision and get the best results from your pressure washing efforts.
What Are Pressure Washer Water Tanks?
Pressure washer water tanks contain the water for power washing equipment. Made from durable polyethylene, they come in various sizes to accommodate different cleaning needs.
The Importance of Water Tanks in Pressure Washing
Water tanks play a crucial role in pressure washing by creating the necessary force to pump water through the pressure washer, adding power to the cleaning process.
Using a tank with your pressure washer also conserves water. Pressure washers are known for their efficiency, typically using only up to 8 gallons of water per minute compared to the 20 gallons per minute a regular garden hose might consume.
Additionally, water tanks help protect your pressure washer’s components. Running a pressure washer without a constant water supply can damage the pump, seals, and gaskets. A water tank ensures a steady flow of water, preventing potential equipment damage and extending the life of your pressure washer.
Standard Pressure Washer Water Tank Sizes
The size of your water tank directly affects the volume of water released while pressure washing. Here are the typical sizes in gallons per minute (GPM):
- 0 to 10 GPM: 1 gallon of drawdown for every 1 GPM of flow
- 10 to 20 GPM: 1 ½ gallons of drawdown for every 1 GPM of flow
- 20-plus GPM: 2 gallons of drawdown for every 1 GPM of flow
Drawdown refers to the amount of water pumped and released through pent-up pressure. The size you need depends on the area you plan to clean. For large areas with significant dirt and stains, a tank set for 10 to 20 GPM is ideal. For smaller jobs, a 0-to-10 GPM tank should suffice.
How Does Size Influence Pressure?
The size of your water tank directly influences the operating pressure, also known as drawdown. Generally, the higher the operating pressure, the larger the water tank needs to be.
A good rule of thumb is that higher pressure results in lower drawdown, requiring a water tank with more capacity. This ensures you have enough water volume to maintain consistent pressure for the duration of your cleaning task. The sizes of the washer and the tank are correlated and must be adjusted accordingly when one of them changes—if one increases or decreases, then the other must, too.
Choosing the Right Water Tank Size
When choosing the appropriate water tank size for your pressure washing tasks, consider your needs. Cleaning large areas naturally requires more water, and you’ll benefit from a bigger tank. Surfaces vary in how much work they take to clean. Concrete, which doesn’t need detergent or multiple cleaning sessions, will require less water (and, thus, a smaller tank) than wood or astroturf.
Also, take into account how often you need to use your pressure washer. Large tanks can save time on refilling. Lastly, you shouldn’t overlook portability. If you need to move around your property with your power washer, a smaller tank is your best bet.
Calculating Your Water Tank Needs
To determine the right tank size, use this simple calculation:
- Estimate the GPM (gallons per minute) of your pressure washer.
- Determine the average cleaning time for your typical projects.
- Multiply the GPM by the cleaning time to get the total gallons needed.
- Add 20% to this number to account for unexpected needs.
For example, if your pressure washer uses 2 GPM and you typically clean for 30 minutes, you’d need at least a 60-gallon tank (2 GPM x 30 minutes = 60 gallons) plus 20% extra, totaling 72 gallons.
Recommended Tank Sizes for Common Tasks
Here are some general recommendations for tank sizes based on common pressure-washing tasks:
- Small decks or patios: 50- to 100-gallon tank
- Average-sized driveways: 100- to 200-gallon tank
- Large exterior home cleaning: 200- to 300-gallon tank
- Commercial cleaning jobs: 300-plus gallon tank
Remember, it’s often better to have a slightly larger tank than you think you’ll need to avoid running out of water mid-job.
Setting Up Your Pressure Washer and Water Tank
Once you’ve selected the right water tank size, it’s time to set up your equipment.
Step-by-Step Setup Guide
Follow these steps to set up and start using your pressure washer:
Step 1: Prepare your equipment. Gather your pressure washer, water tank, hoses, and any necessary attachments. Review the manuals for both the pressure washer and water tank.
Step 2: Set up the water tank. Attach a threader to the water tank’s banjo fitting. Use Teflon tape to securely fasten the inline to the PVC. Attach the barb connector and ball valve, tightening by hand to avoid damage.
Step 3: Attach the hose to the water tank. Connect the garden hose to the tank via the barb connector. Clamp the connection tightly to prevent water leakage.
Step 4: Connect the hose to the pressure washer. Attach the hose to the pressure washer’s feed line. Ensure the washer’s inlet filter is clear of debris to prevent obstructions. Fasten the connection tightly to prevent air from entering.
Step 5: Start cleaning. Turn on the pressure washer and begin cleaning. Start by expelling air from the washer’s pump system by pressing the spray wand trigger.
Choosing the Right Nozzle
Select the right nozzle for the best cleaning and conserving water. Flushing nozzles are best for general cleaning, while detergent spray nozzles are best for deep cleaning or when soap is required. Blasting nozzles are good for deep stains, but be careful not to damage surfaces with them.
Maintaining Your Pressure Washer and Water Tank
Follow these maintenance tips to keep your equipment in top shape:
- Flush the system: After each use, run clean water through the system to remove any debris or detergent residue.
- Check connections: Regularly inspect all hoses and fittings for leaks or damage.
- Clean filters: Clean or replace the water inlet filter as needed to maintain proper water flow.
- Store properly: Empty the water tank and pressure washer when not in use, especially in cold weather.
- Inspect seals: Check pump seals and O-rings for wear and replace as necessary.
Troubleshooting Common Issues
If you run into problems with your pressure washer or water tank, try these troubleshooting steps:
- Low pressure: Check for kinks in the hose, clean the nozzle, or inspect the pump for issues.
- No water flow: Ensure the water source is turned on and check for blockages in the hose or nozzle.
- Leaks: Tighten connections or replace damaged hoses or fittings.
- Pump problems: If the pump isn’t working correctly, consult the manual or a professional for repair options.
Final Thoughts About Water Tank Sizes for Pressure Washing
When choosing the right water tank size for your pressure washer, factor in the size of your cleaning area, frequency of use, and the specific tasks you’ll be tackling. While it’s tempting to go for the largest tank available, find the right balance between capacity and practicality. A properly sized tank will provide enough water for your tasks while still being manageable to transport and store.
