Short answer: A stainless-steel exterior does not mean an appliance is safe to pressure wash. Water jets can enter controls, vents, sensors, motors, insulation and cable penetrations.
A machine develops electrical, sensor or insulation faults after aggressive washdown. The common misconception is that stainless steel casing means the whole appliance can be pressure washed. This article turns that assumption into specific checks that can be recorded on the drawing, survey or commissioning sheet.
Model-specific rule: Never infer washdown suitability from appearance; isolate safely and follow the manufacturer’s instructions. Where gas, electricity, refrigeration, guarded components, hot oil, pressure or safety controls are involved, use the appropriately competent engineer and never bypass a safety device.
Stainless is not an ingress rating
The casing material may resist corrosion while joints, displays and ventilation openings remain vulnerable. Only the exact cleaning instructions define the permitted method.
- Find the manufacturer cleaning section.
- Identify vents, controls and cable entries.
- Do not infer protection from appearance.
Jets drive water past seals
High pressure can defeat door gaskets and splash seals that cope with normal wiping or low-energy splashes. Faults may appear later after moisture reaches connections.
- Avoid direct jets at seals and panels.
- Stop if controls behave unpredictably after cleaning.
- Record the cleaning method before an engineer attends.
Design the room around the approved method
If floor washdown is required, keep vulnerable appliances outside the spray path or provide an approved physical arrangement. Do not rely on staff remembering every hidden opening.
- Mark cleaning zones and exclusions.
- Coordinate sockets and cable entries.
- Provide suitable tools for non-jet cleaning.
What the site evidence may show
| Observation | Hidden issue | Next check |
|---|---|---|
| Exterior is stainless | Controls/vents are unprotected | Use manual-approved cleaning |
| Fault follows washdown | Moisture may be involved | Stop use if electrical safety is uncertain |
| Room is hose cleaned | Spray reaches appliance base | Redesign zone or method |
A practical verification sequence
- Confirm the exact duty and model. Record what the appliance or space must achieve at peak service and use the current model-specific installation information.
- Draw the complete interface. Include moving parts, service/removal access, connections, adjacent equipment and the real operator or trolley position.
- Measure under a representative condition. Static, empty or isolated tests can hide the issue. Record the operating state, value, unit and test point.
- Correct and prove. Repeat the same test after any change and retain the evidence with commissioning or O&M information.
Checks to record:
- Manual cleaning restrictions.
- IP rating if declared.
- vents.
- control panel.
- cable entry.
- floor splash direction..
Teach readers to check the exact cleaning method, ingress limits, seals, vents and exposed electrical areas before choosing spray cleaning. The result should be a measurable decision rather than a generic note such as “allow sufficient space” or “services by others”.
Common mistakes to avoid
- Equating stainless steel with waterproof construction.
- Spraying control panels and ventilation grilles.
- Powering equipment immediately after suspected water ingress.
- Using pressure to compensate for poor physical access.
Frequently asked questions
Can an IP rating be assumed from the data plate?
No. Use only a declared rating and the manufacturer’s specific cleaning instructions for the complete installed appliance.
What if water enters an electrical area?
Stop use and follow the site isolation procedure; obtain competent assessment before returning the unit to service.
Is steam cleaning automatically safer?
No. Heat, pressure and moisture can still damage unsuitable components; follow the approved method.
Related Kitchen Install Guide reading
- Where Should Floor Gullies Go in a Commercial Kitchen?
- Electrical Services Through Wet and Hot Kitchen Areas
- What Makes a Stainless-Steel Joint Hygienic?
Record the installation detail before handover
Use the KIG 318 Commercial Kitchen Installation Checklist to record equipment interfaces, measured conditions, outstanding actions and acceptance evidence.
Sources and further guidance
- Hoshizaki: Ice-cuber installation manual
- Hoshizaki: Ice-flaker installation manual
- HSE: Work using electrically powered equipment
Last reviewed: 14 August 2026. This article provides general commercial-kitchen design and installation information. It does not replace the exact manufacturer instructions, a site-specific design, risk assessment or work by competent specialists. Stop use and obtain competent help where equipment or services may be unsafe.