Buying a pressure washer is usually the easy part. The problem often appears when you take the machine to the place where you actually want to use it and discover that there is no convenient water supply.

There may be no hose bib at the job site. The nearest water connection may be too far away to reach with a hose, or the available water supply may not provide enough flow for the pressure washer. If you wash vehicles, clean equipment, work on properties, or provide mobile pressure washing services, you may also need to move your pressure washer from one location to another without knowing in advance whether water will be available.

This is especially common when washing cars or detailing vehicles away from home, cleaning construction equipment, working at rural properties, or providing mobile pressure washing services. In these situations, carrying your own water can be much more practical than depending on the customer’s water supply.

Do You Actually Need a Water Tank for Your Pressure Washer?

A water tank is not automatically necessary for every pressure washer setup. If you normally work close to a suitable hose bib and the available water supply provides enough flow for your machine, connecting the pressure washer directly to the water supply may be simpler and less expensive.

A tank becomes much more useful when the location where you need to work does not have a convenient water source. If there is no hose bib, the water connection is too far away, or you regularly work in different locations, carrying your own water can give you much more flexibility.

A portable water tank can also make sense for mobile pressure washing. Instead of arriving at a customer’s property and first looking for a usable water connection, you can bring a known quantity of water with you. This is particularly useful for mobile car washing, vehicle detailing, equipment cleaning, property maintenance, and other jobs where the pressure washer needs to operate away from a fixed water supply.

You may also want a tank if you prefer to have control over your own water supply. For example, a property may have a water connection, but the flow may be inconsistent or the connection may not be conveniently located. In that situation, having water stored on the vehicle or trailer can make the pressure washing setup more predictable.

On the other hand, if you always have a suitable municipal water supply nearby and your pressure washer is designed to operate from that supply, adding a tank may only make the setup larger and more complicated. You would have another container to transport, fill, secure, and eventually clean.

The key question is therefore not simply whether a pressure washer can be connected to a tank. It is whether a tank solves a real water-supply problem in the way you intend to use your pressure washer.

If you do need your own water supply, the next question is how to get that water from the tank to the pressure washer pump.

Can a Pressure Washer Run From a Water Tank?

Yes, a pressure washer can run from a water tank, but the tank itself does not guarantee that the pressure washer will receive enough water.

A typical setup looks like this:

Water tank → water outlet → supply hose → pressure washer inlet → pump

When the pressure washer is running, its pump draws water through the inlet. The water supply therefore needs to keep up with the pump’s demand. If the pump needs more water than the tank system can deliver, the pressure washer may not operate correctly even though the tank contains plenty of water.

This is where one of the most common misunderstandings about pressure washer water tanks comes in: water capacity and water supply are two different things.

A tank might hold 100 gallons of water, but that does not mean it can automatically deliver the required flow to the pressure washer. Conversely, a smaller tank can work well if its outlet, hose, and water-supply arrangement can provide the flow the pressure washer requires.

Pressure Is Not the Same as Flow

Pressure and flow are related, but they are not the same measurement.

Pressure is commonly expressed in PSI and describes the force available in the water system. Flow is commonly expressed in GPM and describes how much water is moving through the system over time.

For a pressure washer connected to a water tank, flow is particularly important because the pump needs a continuous supply of water. A tank may have plenty of stored water but still fail to provide the pump with enough water at its inlet.

This is why simply choosing a larger pressure washer water tank is not always the solution. A larger tank gives you more stored water and potentially more operating time, but it does not by itself solve an inadequate water supply to the pump.

What Determines Whether the Tank Can Supply the Pressure Washer?

Several parts of the setup can affect how effectively water reaches the pressure washer.

The first is the pressure washer’s water requirement. Check the manufacturer’s specifications for the pump’s required inlet flow and any requirements regarding inlet pressure or water supply.

The second is the tank outlet. A restrictive outlet or fitting can limit how quickly water leaves the tank, even when the tank itself contains a large amount of water.

The supply hose also matters. Hose diameter, length, fittings, bends, and restrictions can all affect the amount of water that reaches the pressure washer.

Elevation can matter as well. If the pressure washer is positioned significantly higher than the water level in the tank, gravity has less pressure available to move the water toward the pump. A setup where the pressure washer sits close to or below the tank outlet is generally easier to supply than one where the pump must pull water uphill.

For this reason, choosing a tank for a pressure washer should involve more than asking, “How many gallons does it hold?” You also need to consider how the water will move from the tank to the pump.

Once you understand this distinction, the choice between a gravity-fed setup and a pump-fed setup becomes much easier to evaluate.

How Does a Water Tank Supply Water to a Pressure Washer?

A pressure washer needs a continuous supply of water at the inlet. When you use a water tank instead of a household faucet or another pressurized water source, the water has to travel from the tank to the pressure washer through a supply line.

There are two common ways to set up this connection: gravity-fed and pump-fed.

Gravity-Fed Water Supply

In a gravity-fed setup, water moves from the tank to the pressure washer because of gravity.

The basic arrangement is:

Water tank → tank outlet → supply hose → pressure washer

The tank is connected to the pressure washer through an appropriate outlet, valve, and supply hose. As water leaves the tank, gravity provides the force that moves it toward the pressure washer inlet.

This setup can be relatively simple because it does not require a separate transfer pump. However, the pressure washer still needs to receive enough water at its inlet to operate properly.

The height of the tank, the size and length of the supply hose, the tank outlet, and the pressure washer’s water requirements can all affect how well a gravity-fed setup works. A tank placed too low, a restrictive outlet, or an undersized hose can reduce the available water flow.

For this reason, you should not assume that every pressure washer will work equally well with a gravity-fed tank. Check the manufacturer’s requirements for inlet water flow and pressure before connecting the machine to a tank.

Pump-Fed Water Supply

A pump-fed setup adds a transfer or booster pump between the tank and the pressure washer.

The basic arrangement is:

Water tank → transfer or booster pump → supply hose → pressure washer

Instead of relying primarily on the height of the tank, the pump actively moves water from the tank toward the pressure washer.

This can be useful when gravity alone does not provide the flow or inlet pressure required by the pressure washer. It can also provide more flexibility when the tank cannot be positioned high enough above the machine.

The pump, however, becomes another part of the system that needs to be selected and installed correctly. Its flow rate, pressure capability, hose connections, and compatibility with the pressure washer all matter.

A pump that is too small may not provide enough water for the machine, while choosing equipment without considering the pressure washer’s inlet requirements can create a different set of problems.

Understanding the Complete Water Path

Whether the system is gravity-fed or pump-fed, the basic water path looks like this:

Water Tank

↓

Tank Outlet

↓

Supply Hose

↓

Optional Pump

↓

Pressure Washer

↓

High-Pressure Hose

↓

Nozzle

The important distinction is that the tank does not create the high-pressure spray itself. The tank’s job is to store and supply water to the pressure washer. The pressure washer then uses that incoming water to produce the high-pressure flow delivered through the high-pressure hose and nozzle.

Understanding this water path makes it easier to determine what kind of tank, hose, outlet, or pump your setup may require.

What Size Water Tank Do You Need for a Pressure Washer?

The right water tank size depends mainly on how much water your pressure washer uses and how long you need to operate before refilling the tank.

There is no single tank capacity that is ideal for every pressure washer. A machine used for short cleaning jobs has very different water-storage requirements from a mobile pressure washing setup that needs to work for an extended period away from a reliable water source.

A useful way to estimate the required capacity is to start with the pressure washer’s GPM rating.

Start With Your Pressure Washer’s GPM

Pressure washer water consumption is commonly expressed in gallons per minute, or GPM.

For example, a pressure washer may be rated at 2.0 GPM, 2.5 GPM, 3.0 GPM, or 4.0 GPM.

This number gives you an important starting point for estimating how quickly a water tank could be emptied during operation. However, the GPM rating should not automatically be interpreted as the exact amount of water the machine will consume continuously in every real-world situation.

Your actual water usage can vary depending on the equipment, operating pressure, trigger time, cleaning method, and other conditions.

For tank sizing, the useful question is therefore not simply “What tank size is best for a 3 GPM pressure washer?” Instead, ask how much water the machine is likely to use during the period you need to work before the tank can be refilled.

Estimate Your Available Runtime

A simple way to estimate theoretical water supply time is:

Tank capacity in gallons ÷ water consumption in GPM = approximate minutes of water supply

For example, if a tank contains 100 gallons and a pressure washer uses 3 GPM:

100 gallons ÷ 3 GPM ≈ 33 minutes

This means a full 100-gallon tank contains enough water for approximately 33 minutes at a continuous 3 GPM consumption rate.

This is a theoretical calculation rather than a prediction of actual cleaning time.

In real use, the pressure washer may not run continuously. The operator may release the trigger, move equipment, change attachments, reposition the vehicle, or pause between cleaning areas. These trigger-off periods can significantly extend the amount of elapsed time before the tank is empty.

Actual performance can also be affected by water recovery, refilling, pump efficiency, hose configuration, and other operating conditions.

The calculation is therefore best used as a starting point for understanding the relationship between tank capacity and operating time.

Typical Water Tank Capacities

Portable and mobile pressure washing setups can use tanks ranging from relatively small containers to several hundred gallons. Some common capacity ranges include:

Tank size	Typical use
25 gallons	Small jobs, short-duration work, or backup water supply
35–50 gallons	Mobile and light-duty setups
65–100 gallons	Longer mobile pressure washing jobs and a wider range of applications
125–250+ gallons	Applications requiring more stored water and longer periods between refills

These ranges are not fixed recommendations. A 50-gallon tank may be sufficient for one operator and completely inadequate for another, depending on the pressure washer’s water consumption and the duration of the job.

Tank size also affects the practical side of mobile operation. A larger tank provides more stored water, but it also takes up more space and adds substantially more weight to the vehicle.

The best starting point is therefore to calculate your expected water requirement first, then check whether the resulting tank can realistically fit your vehicle and operating setup.

What Else Should You Check Before Buying a Pressure Washer Water Tank?

Once you know approximately how much water you need, tank capacity is only one part of the decision.

A tank also has to fit your vehicle, connect properly to your water supply system, and remain practical when completely filled. Looking at these details before buying can help prevent a situation where a tank has enough capacity but does not work with the rest of your setup.

Tank Capacity

Capacity determines how much water you can carry before you need to refill.

Use your pressure washer’s actual or expected water consumption and the amount of working time you need to estimate the required capacity. Then consider how often you have access to a refill point.

A larger tank is not automatically better if the additional capacity creates problems with vehicle space, payload, or handling.

Tank Dimensions

Physical dimensions are particularly important for mobile pressure washing.

A tank may have the required gallon capacity but still be unsuitable because of its length, width, or height.

Measure the available space in your pickup truck, trailer, van, or other service vehicle before selecting a tank. Check not only the floor area but also clearance around the tank for hoses, valves, fittings, and other equipment.

For pickup applications, the tank’s shape and footprint can be just as important as its stated gallon capacity.

Tank Weight

Water is heavy, and this becomes increasingly important as tank capacity increases.

Water weighs approximately 8.34 pounds per gallon.

That means a full tank contains approximately:

Tank capacity	Weight of water when full
50 gallons	417 lb
100 gallons	834 lb
150 gallons	1,251 lb

These figures represent the water alone. The total loaded weight also includes the tank itself, pressure washer, hoses, pump, accessories, tools, fuel, and anything else being carried by the vehicle.

For a mobile setup, this makes payload capacity an important part of tank selection. A tank that physically fits in a vehicle may still be too large once it is completely filled and loaded with the rest of the equipment.

Tank Outlet

The tank outlet is the connection point between the stored water and the supply system.

Before buying a tank, check the outlet size and the type of fitting used. You should also consider the valve and how the outlet will connect to your supply hose or pump.

A mismatch between the tank outlet and the rest of the water-supply system can require additional fittings or create unnecessary restrictions in the water path.

The goal is to make sure water can move from the tank into the pressure washer at the required flow rate.

Tank Material

Most portable water tanks are made from durable plastic materials such as polyethylene.

When comparing tanks, consider whether the material is intended for water storage and whether the tank is designed to withstand the conditions in which you plan to use it.

UV resistance can be important for tanks that remain outdoors or are regularly exposed to sunlight. Durability also matters when the tank will be transported in a truck or trailer and subjected to normal movement and handling.

You do not necessarily need to compare every technical property of the plastic. The more important question is whether the tank’s construction is appropriate for your intended water-storage and mobile-use conditions.

Tank Shape

Tank shape determines how easily the tank fits into your particular setup.

Common configurations include vertical tanks, horizontal tanks, low-profile tanks, and tanks designed specifically around the dimensions of a pickup bed or other vehicle.

A vertical tank may use less floor space while taking up more vertical clearance. A low-profile or horizontal tank may spread the same amount of water over a larger footprint while keeping the overall height lower.

For mobile pressure washing, the practical choice is therefore not simply the tank with the right gallon rating. You need a tank whose shape and dimensions work with the available space while still allowing you to connect the water supply system and carry the loaded weight safely.

Dưới đây là nội dung hoàn chỉnh cho Sections 7–11, giữ cùng cách triển khai với phần trước: tiếng Anh tự nhiên, không bullet, không in đậm, dùng heading theo đúng thứ tự và không thêm H1.

Do You Need a Pump Between the Tank and Pressure Washer?

If I already have a tank, why can’t I just connect the pressure washer to it?

In some setups, you can. A pressure washer does not automatically require a separate pump simply because its water comes from a tank. What matters is whether the water supply can provide the flow and inlet conditions that the pressure washer requires while it is operating.

A gravity-fed setup can work when the tank is positioned appropriately and water can flow from the tank to the pressure washer at a sufficient rate. The tank outlet, supply hose, fittings, and elevation between the tank and machine all affect how much water actually reaches the pressure washer.

When a Pump May Be Needed

A pump may be needed when gravity alone cannot provide enough water to the pressure washer. This can happen when the tank is positioned low relative to the machine, when the supply hose is long, or when restrictions in the hose, fittings, or filter reduce the available flow.

The pressure washer itself may also have specific inlet requirements. Some machines are designed to work with a particular water supply arrangement and may not operate correctly if the incoming water supply is inadequate.

The amount of water available at the tank outlet is also important. A tank may contain plenty of water but still fail to provide sufficient flow under operating conditions. When the pressure washer is running, the actual flow through the supply system can be lower than expected because of hose resistance, elevation, fittings, filters, or other restrictions.

In these situations, a properly sized pump can help provide the pressure washer with a more consistent water supply. The pump should be selected based on the requirements of the complete system rather than simply adding the largest pump available.

When a Pump May Not Be Necessary

A separate pump may not be necessary when the pressure washer is designed to accept water from a gravity-fed tank and the tank can provide adequate flow through the outlet and supply hose.

A tank positioned above or sufficiently close to the pressure washer can provide useful gravity pressure. A suitable outlet and adequately sized hose can also help maintain the required flow.

The key question is therefore not whether a water tank is being used, but whether the pressure washer is receiving the water supply it requires.

Before adding a pump, check the pressure washer manufacturer’s specifications for inlet water requirements and confirm that the tank, outlet, hose, and installation can meet those requirements. If the existing setup provides sufficient water flow, an additional pump may not be needed.

What Kind of Water Tank Works for Pressure Washing?

The right water tank depends on how and where you plan to use the pressure washer. A tank for occasional car washing has different requirements from a tank installed on a vehicle for a mobile pressure washing business.

Instead of choosing a tank simply by its shape or capacity, consider the way the tank will be transported, positioned, filled, and connected to the pressure washer.

Portable Water Tank

A portable water tank can be practical for occasional pressure washing, small cleaning jobs, and situations where the tank needs to be moved between locations.

This type of setup can be useful when a convenient water connection is not available at the job site. The tank can be filled beforehand and transported to where the cleaning work will take place.

For smaller jobs, a compact tank may also be easier to handle than a large tank. However, the available water still needs to be sufficient for the pressure washer and the expected operating time.

Pickup Truck Water Tank

A pickup truck water tank is commonly suited to mobile pressure washing and other cleaning applications where water needs to be transported directly to the job site.

The truck provides a convenient platform for carrying a larger tank, while the tank can supply water to the pressure washer during mobile operations.

When choosing this type of setup, tank capacity is only one consideration. The tank dimensions, mounting arrangement, vehicle payload, water weight, and overall equipment layout also need to be considered.

Water is heavy, so a larger tank can significantly increase the total load carried by the vehicle. The tank and its contents should therefore be compatible with the vehicle and secured appropriately during transportation.

Low-Profile Water Tank

A low-profile water tank can be useful when available height is limited or when the tank needs to fit within a particular vehicle or trailer configuration.

Its lower overall height can make it easier to integrate into certain pickup truck or trailer setups. Depending on the installation, a low-profile design can also help keep the water weight closer to the vehicle’s floor.

The available footprint and tank capacity should still be checked carefully. A tank that fits the available space is only useful if it can also provide the required amount of water for the intended application.

Larger Stationary or Transport Tank

A larger stationary or transport tank may be appropriate for longer pressure washing jobs or applications that require a greater amount of water at the work site.

This type of tank can reduce the need for frequent refilling when the equipment and transportation method can safely accommodate the additional weight and size.

For larger installations, the complete water supply system becomes increasingly important. The tank outlet, hose, pump if required, filtration, fittings, and pressure washer should all be considered together rather than selecting the tank in isolation.

The best tank is therefore not necessarily the largest one. It is the tank that provides the required water capacity while fitting the available space, transportation method, and pressure washing setup.

Choosing a Water Tank Based on Your Pressure Washing Setup

The best water tank for a pressure washer depends on the specific setup. Before choosing a tank, consider how often you will use the pressure washer, where the water tank will be located, how much water the machine consumes, and how the tank will be transported.

Your situation	What to consider
Washing cars occasionally	A smaller portable tank may be sufficient for shorter jobs
Mobile detailing	A compact tank combined with an adequate water supply
Mobile pressure washing	Larger capacity, vehicle payload, and secure mounting
No hose bib at the job site	A portable tank can provide an independent water source
Tank sits below the pressure washer	Check whether the pressure washer can receive adequate flow or whether a pump is required
Long supply hose	Check hose diameter, length, restrictions, and available flow
Long work sessions	Consider a larger tank or a practical refill strategy

Match Tank Capacity to Water Consumption

Tank capacity should be considered together with the pressure washer’s water consumption. A machine using more gallons per minute will consume the available tank water faster than a lower-flow machine.

For example, a tank that appears large when viewed by itself may provide only a limited operating time if the pressure washer has a relatively high water flow rate.

The actual operating time will also depend on how continuously the pressure washer is running. A machine that is triggered only intermittently will use water differently from one operating continuously.

Consider the Complete Setup

Tank selection should not be based on capacity alone. The tank needs to work with the vehicle or location, supply hose, outlet, filtration, pump if required, and pressure washer.

The position of the tank is particularly important. A tank located below the pressure washer may have different water supply requirements from a tank positioned above or close to the machine.

Before purchasing a tank, check the pressure washer manufacturer’s water supply requirements and then make sure the proposed tank setup can meet them.

How to Connect a Water Tank to a Pressure Washer

Connecting a pressure washer to a water tank is generally straightforward, but the exact arrangement depends on the pressure washer and whether the tank can provide adequate water flow without assistance.

Basic Setup

Start by positioning the water tank in a suitable location. If the tank is being transported in a vehicle or trailer, make sure it is properly secured before the equipment is operated or transported.

Connect the tank outlet to a suitable water supply hose. The hose should be compatible with the water flow requirements of the pressure washer and should not be unnecessarily restricted by undersized fittings, filters, or connectors.

If the pressure washer requires additional water pressure or gravity flow is not sufficient, install a suitable pump between the tank and the pressure washer according to the equipment manufacturer’s requirements.

Connect the supply hose to the pressure washer’s water inlet. Before starting the machine, make sure water can reach the pressure washer pump and that the supply line is free of obvious restrictions or trapped air.

Allow water to flow through the system as required by the pressure washer manufacturer’s instructions. Check that the water supply is consistent before starting the pressure washer.

Once the water supply is established, start and operate the pressure washer according to its manufacturer’s instructions.

Do Not Run the Pressure Washer Without Adequate Water

A pressure washer pump needs an adequate water supply to operate correctly. If the incoming water flow is insufficient, the machine may lose pressure, surge, make unusual noises, or experience other operating problems.

For this reason, do not assume that having water in the tank automatically means the pressure washer is receiving enough water. The tank outlet, hose, elevation, fittings, filter, and pump arrangement can all affect the actual supply reaching the machine.

Always follow the pressure washer manufacturer’s instructions for connecting and operating the machine with an external water source.

Common Problems When Using a Pressure Washer With a Water Tank

Using a water tank can provide an independent water source for pressure washing, but problems can occur when the tank and pressure washer are not properly matched.

The first step when troubleshooting any problem is to check the pressure washer manufacturer’s requirements. Different machines can have different water supply specifications and operating systems.

Pressure Washer Loses Pressure

A pressure washer that loses pressure may not be receiving enough water. Insufficient tank flow, a restricted supply hose, a clogged filter, or air entering the supply line can all affect the water reaching the machine.

The problem may also occur when the water supply system cannot maintain adequate flow while the pressure washer is operating.

Check the tank water level, outlet, hose, filter, fittings, and supply arrangement. If the tank is below the pressure washer or the supply line is particularly long, check whether the installation requires a pump.

Check the pressure washer manufacturer’s requirements before changing the water supply system.

Pressure Washer Surges

Surging can occur when the water supply is inconsistent or when air enters the inlet system. A restriction in the supply hose or filter can also interfere with consistent water flow.

Check that the tank outlet is open, the hose is not kinked or restricted, and the supply system is providing a steady flow of water.

If the problem continues, consult the pressure washer manufacturer’s troubleshooting instructions rather than assuming that the tank itself is the cause.

Pressure Washer Shuts Off

A pressure washer that shuts off may be responding to a water supply problem, a protection system, or another machine-specific condition.

Water starvation can be one possible cause when the tank cannot supply enough water to the pressure washer. However, the exact reason depends on the machine and its safety or control system.

Check the water supply first and then follow the manufacturer’s troubleshooting procedure for the specific pressure washer.

Tank Drains Too Quickly

A tank can drain faster than expected when the pressure washer has a relatively high water flow rate or when the machine is being operated continuously.

A tank that seems large enough for occasional cleaning may not provide enough water for a long pressure washing session.

If the tank drains too quickly, compare its usable capacity with the pressure washer’s water consumption and expected operating time. The solution may be a larger tank, shorter operating periods, or a practical way to refill the tank between jobs.

Pump Makes Unusual Noise

An unusual noise from a water supply pump can indicate insufficient incoming water, air in the supply line, cavitation, or a restriction on the pump inlet.

Check the tank water level, inlet hose, filter, fittings, and other components that may restrict the water entering the pump.

Do not assume that increasing pump pressure will solve the problem. A pump needs an appropriate water supply on its inlet side, and the complete system should be checked against the pump manufacturer’s requirements.

If unusual noise continues, stop and follow the pump and pressure washer manufacturer’s troubleshooting instructions before continuing to operate the equipment.

Recommended Portable Water Tanks for Pressure Washing

Once you know how much water your pressure washer needs and how the tank will be connected, choosing a tank becomes much easier. The right tank is not simply the one with the largest capacity. Its dimensions, outlet, shape, and ability to stay stable during transportation can all affect how well it works with a pressure washing setup.

The following three tanks represent practical options for different types of pressure washing applications.

Norwesco 65-Gallon Horizontal Leg Tank

The Norwesco 65-gallon horizontal leg tank is a practical option for users who need a portable water supply without moving up to a very large tank. The 65-gallon model is listed with a 23-inch diameter, 26-inch overall height, and 43-inch length. It has a 5-inch fill opening and a 3/4-inch outlet.

Its horizontal shape makes it suitable for applications where a relatively low and compact tank is easier to fit into a vehicle or trailer. The molded-in legs also help reduce water movement inside the tank during transportation.

For pressure washing, a 65-gallon tank can be useful when you want enough water for smaller jobs while keeping the overall setup relatively compact. It can also be a reasonable starting point if you are still determining how much water your particular pressure washer consumes during actual work.

One important detail is the outlet size. A 3/4-inch outlet may be suitable for some setups, but the connection should be checked against the inlet requirements of the pump or pressure washer. If the system requires greater flow, the outlet, hose, fittings, and pump may need to be considered together rather than looking at the tank alone.

This type of tank is particularly suitable for smaller mobile pressure washing setups where portability and space are important.

Which Tank Size Makes Sense for Your Setup?

There is no single tank size that works for every pressure washer. A smaller tank can be easier to transport and may be sufficient for short jobs, while a larger tank gives you more operating time before a refill is necessary.

Before choosing a tank, calculate the approximate water consumption of your pressure washer and compare it with the amount of water you realistically need for one job. Then consider the weight of the full tank, the available space in your vehicle, the tank outlet, and whether your pressure washer needs a supply pump.

A 65-gallon tank can make sense when keeping the setup compact is important. A 100-gallon tank provides a larger water reserve, but the additional water weight needs to be accounted for before installation or transportation.

The goal is not to buy the largest tank that fits your vehicle. The goal is to build a water supply system in which the tank, hose, fittings, pump, and pressure washer can work together reliably.