What do maintenance costs consist of?

Five main items: cleaning agents, preventive maintenance, corrective maintenance for breakdowns, energy and water consumption during cleaning cycles, and the hidden downtime costs. The latter are usually the most significant - lost revenue, spoiled stock, stressed staff.

Is a maintenance contract required for the manufacturer warranty?

Not mandatory, but strongly recommended. Without regular maintenance, service life decreases and repair costs rise. For some components the warranty is voided without evidence of regular maintenance. JMGT handles this completely - we work out a contract that suits your situation.

How often do I need to descale?

With a functioning water softener you do not need to descale yourself - the steam generator cleans itself automatically. Without a softener, regular descaling is necessary, with additional costs and the risk of limescale damage. We measure water hardness during the kitchen check and advise whether a softener is worthwhile.

Which cleaning agent should I use?

Rational specifies Active Clean (original tablets). Alternative agents can void the warranty and damage the steam generator. The oven recognises the tablet type and refuses the programme if the wrong agent is used. The correct tablets are available from JMGT - ask your contact for the current price and ordering options.

What can I do myself to keep costs down?

Daily cleaning and filter checks are handled by your staff. Active Clean cycles start automatically. Deeper inspections, calibrations and replacement of wear parts must be done by an authorised technician - otherwise the warranty is voided. A maintenance contract handles this in a structured way.

Is a used Rational more expensive to maintain?

No. A well-maintained used Rational from year of manufacture 2018-2019 has comparable maintenance costs to a new iCombi Pro. The difference is the purchase price. For many kitchens this is an attractive option - lower investment, same energy efficiency, same cleaning regime.

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Knowledge base/ Maintenance

What does professional combi oven maintenance cost per year?

Maintenance costs can vary significantly - depending on brand, usage intensity and service provider. Anyone who only looks at the purchase price overlooks a substantial part of the true costs over the entire service life.

By JMGT Commercial Kitchen Equipment · 27 May 2026

Summary

Maintenance costs consist of five items. The largest - downtime - is barely visible in a quote but is the most critical. With the right cleaning regime, a water softener and a maintenance contract you keep costs and risks under control.

The five cost items

Cleaning agents
Tablets and descalers per cleaning cycle. The amount depends on usage intensity and whether you clean daily or multiple times per day.
Preventive maintenance
Regular inspections, replacement of wear parts such as seals and filters. Prevents the majority of breakdowns.
Corrective maintenance
Call-out costs, labour and parts for breakdowns. Highly dependent on unit, age and usage intensity.
Energy and water
Electricity and water during automatic cleaning cycles. Significantly higher with older units than with a new Rational iCombi Pro or used unit from year of manufacture 2018-2019.
Downtime
The biggest hidden cost item: lost revenue while the unit is out of service. Often more than all other items combined.

What drives costs up

No maintenance contract - reactive service costs more than preventive.
Wrong or non-original cleaning agents - warranty loss and increased wear.
Hard water without a softener - limescale damage occurs in months, not years.
Older units - more breakdowns, higher energy costs, lower output.
No dedicated service partner - longer waiting times for repair and parts.

What reduces costs

A maintenance contract with preventive inspections
Original Rational Active Clean tablets - no alternative agents
Water softener on the supply line
Replacement under intensive use before repair costs escalate
A dedicated service partner who knows your unit

New or used unit?

A used Rational from JMGT's stock is an attractive alternative: lower purchase cost, comparable maintenance costs, comparable energy efficiency (from year of manufacture 2018-2019). For many kitchens this is the lowest total cost approach over five years.

We are happy to calculate a concrete example for your situation: investment, maintenance and energy savings in direct comparison.

Next step

Maintenance costs differ by situation. We produce a transparent calculation based on your model, usage and desired service level - no hidden items, no unnecessary services.

Request a maintenance quote View used Rational equipment

Sources

Total Cost of Ownership for combi ovens - Trade magazine Misset Horeca (2023)
Rational ConnectedCooking - maintenance data - Rational AG

JMGT is an authorised Rational dealer and Hoshizaki specialist. The practical insights in this article are based on more than 500 commercial kitchen installations in the Netherlands.