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Daily operation · 4 min read

Car wash operating costs. How to analyse consumption and bills?

A higher bill may mean more activity, higher utility prices or an installation problem. A simple comparison helps distinguish these situations.

TIXEPrepared by: TIXEUpdated:
NETCONNECT — illustration of remote car wash monitoring
NETCONNECT — TIXE remote monitoring. Available data depends on the installation configuration.
3separate columnsQuantity, unit price and total value.
2comparable periodsReadings with operating conditions described.
1consistent unit of activityFor example, active wash minutes from a reliable report.

What this guide covers

Compare the same periods and units. Collect consumption, rates, chemical stocks and car wash usage data. An indicator related to site activity explains change better than an invoice alone. Assign a date and baseline to every upgrade.

How can costs be compared between periods?

Choose a common start and end date for the comparison. Gather water and electricity readings, chemical consumption, operating costs and bay activity data. An invoice issued in March may cover a different period from the March payment report — note this difference before calculating.

01

The same scope

Compare the whole site with the whole site, or the same defined process. Do not mix a main meter reading with a measurement from one piece of equipment.

02

The same unit

Record m³, kWh, kg or litres. Collect activity data using one agreed unit and the same source.

03

Operating conditions

Add the number of available bays, downtime, season and dates of setting changes. Without this, the figures may tell an incomplete story.

A payment does not always mean one customer or one wash. A driver may top up several times. If you do not have a reliable visit count, use available active wash minutes and label the indicator clearly.

Why separate consumption from price?

A bill is affected by both the amount consumed and the rate. Fixed charges need a separate entry. First examine consumption changes, then price changes, and only then compare total values.

Variable cost = consumption × unit rate

Add fixed charges and other bill components separately, based on your own billing.

If the main meter also covers cleaning, water preparation or installation protection, the result describes whole-site consumption relative to operating minutes. It is not the flow rate from a single lance. Keep the same measurement boundary in both periods.

What simple records should you keep?

A clear spreadsheet updated on a consistent schedule is enough. Record each entry's source: meter, invoice, controller report or stock count. Distinguish actual readings from estimates.

Two-period worksheet — fields to complete with your own site data.
ItemPeriod APeriod BWhat to check
Dates and availabilityFrom–to, operating daysFrom–to, operating daysAre the duration and number of operating bays comparable?
Water / electricityStart and end readingsStart and end readingsThe same measurement boundary and unit.
ChemicalsOpening stock + deliveries − closing stockOpening stock + deliveries − closing stockSeparate entries for products, without mixing kg and litres.
Car wash activityReliable activity reportThe same activity reportThe same definition of minutes, cycles or visits.
CostsRates, charges, servicingRates, charges, servicingSeparate purchases, consumption and one-off events.
ChangesNotes on conditionsNotes on conditionsWeather, faults, new programmes and settings.
HETIX ACTIVE AROMA product in TIXE materials
HETIX chemicals: keep a separate record for each product.

For chemicals, start with a stock balance: opening stock plus deliveries minus closing stock. Separate spills, returns and transfers to other sites. A large purchase at the end of the month may increase expenditure without increasing consumption in the period analysed.

What context makes a comparison meaningful?

A change log is as important as a meter reading. Different weather can affect traffic and heating demand, while downtime reduces bay use. Adding a programme changes the mix of services used. This context needs to appear alongside the result.

Unusual water use is worth investigating. A moving meter when no customers are present does not prove a leak: first account for scheduled automatic processes. Report the symptoms and when they occur to the service team.

How can the effect of a change be assessed?

Record the hypothesis before implementation: what should improve, how it will be measured and what the result will be compared against. After the change, use the same indicator definition. Also assess service quality and reliability so reducing consumption does not become the only goal.

  1. Before the changeKeep readings, activity reports, settings and descriptions of conditions.
  2. ImplementationRecord the date, scope and any other changes made at the same time.
  3. After the changeCompare quantities, rates, the activity indicator and service performance.

If conditions differ substantially, treat the result as a reason for further observation. Linking an upgrade to an outcome requires more than comparing two amounts. The data collected will help when planning an upgrade and discussing water management.

FAQ

Frequently asked questions

Can every transaction be treated as one wash?

Not always. Top-ups and different payment methods may create several transactions during one visit. Define the indicator based on the available report.

Are invoices enough to assess chemical consumption?

You also need to account for stock levels and other material movements. A purchase does not equal consumption.

Does a lower unit cost confirm the overall profitability of an upgrade?

It is only one part of the assessment. Investment expenditure, servicing, site availability and service quality must be considered separately.

Sources and materials

The water monitoring approach was cross-checked against EPA materials. The worksheet and two-period example are original educational material. The example figures do not describe the performance or savings of any particular car wash.

Prepared: 13 October 2026. Photos and illustrations from TIXE materials.

Your next step

Turn an observation into a specific question

Prepare two periods of readings, an activity report and a change log. Identify the area you want to assess.

Discuss your car wash data See the other guides

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