Choosing a pressure washer for mobile valeting

Compare flow, working pressure, electrical supply and tank-feed requirements before choosing a machine.

By the Mobile Detailer Equipment team · Updated 2026-10-25

Choose a mobile washer as part of a water and power system. Headline pressure does not establish whether it will draw from your tank, run on your supply or fit with service access. Build a comparison sheet from the exact model's manual, then resolve missing information with its manufacturer before ordering.

Compare figures consistently

Keep maximum and working figures in separate columns. If manufacturers describe pressure differently, do not rank their numbers as though they were identical. Record the source beside each entry and leave unknown information blank. A listing for a similarly named machine is not a substitute for the correct manual.

Turn flow into a water estimate

Divide litres per hour by 60 to obtain litres per minute. Multiply by expected trigger-on minutes. As an illustrative calculation, entering 480 litres per hour gives 8 litres per minute; six minutes represents 48 litres. These are example inputs, not a machine specification or promised consumption per car.

Add bucket filling, equipment rinsing and other uses. Record actual consumption once working and revise the estimate. Use the rig matcher to compare scenarios without assuming every appointment minute involves spraying. A larger tank also affects payload, so revisit the vehicle calculation before increasing capacity.

Confirm tank feeding explicitly

Do not infer suction capability from photographs of similar machines. Ask whether the exact model supports the proposed tank location and plumbing. Obtain inlet hose, filter, priming and supply requirements from the manual or manufacturer. A self-priming description may still come with important installation conditions.

Keep isolation accessible and protect the inlet from contamination. Check the arrangement throughout the intended tank-level range using the prescribed procedure. Investigate unreliable supply instead of repeatedly attempting to run without adequate water. Make routine filter inspection possible in the installed layout.

Match the power source

For mains use, establish stated supply requirements and have the practical electrical arrangement checked appropriately. Cable length, protection and supply conditions matter. Protect connections from the wet work area according to the relevant equipment instructions, and confirm customer facilities before arrival.

For generator use, running watts alone do not prove motor-start compatibility. Obtain the washer maker's recommendation and compare it with continuous generator output, outlet limits and starting capability. The generator guide explains the information to collect. Do not add an invented multiplier where the maker provides no recommendation.

Consider maintenance and downtime

Check replacement hoses, seals, filters and service arrangements before committing. Consider how equipment will be removed and whether routine maintenance points remain accessible. A machine that cannot be inspected without dismantling racking creates avoidable disruption.

Finish with a written checklist: documented water arrangement, confirmed electrical supply, compatible accessories, secure transport and maintenance access. If an essential answer remains unknown, keep the candidate provisional. Once installed, follow the maker's commissioning instructions and retain the documents with the rig. Recheck compatibility when changing accessories or supply arrangements rather than assuming every future combination is covered.