By Commercial Service Company · November 2, 2026
If you run a combi oven or steamer in central Arkansas, you're fighting hard water whether you know it or not. Minerals in the water supply - mostly calcium and magnesium - don't disappear when the water turns to steam. They stay behind as scale, coating everything the steam touches. Over time, that buildup is one of the most common reasons combi ovens and steamers end up with expensive repairs or early replacement.
How Scale Builds Up
Every time your unit boils water to make steam, it leaves mineral deposits behind on heating elements, steam generators, injectors, and the inside of the cooking cavity. A little scale might not seem like a big deal, but it builds in layers. Thin deposits act like insulation on heating elements, forcing them to work harder and run hotter to do the same job. Thicker deposits start clogging small passages - steam injectors, drain lines, water inlet valves - and that's when performance problems show up.
Areas with harder water build scale faster, but no water supply is scale-free. If your kitchen has ever dealt with white, crusty buildup on a coffee maker or faucet aerator, your combi oven is dealing with the same mineral load, just concentrated by heat.
Symptoms Scale Causes
Scale problems rarely show up as a dramatic failure. They show up as a slow decline that's easy to blame on other things. Watch for:
- Longer preheat and recovery times than the unit used to need
- Uneven cooking or steam that doesn't seem to fill the cavity properly
- Error codes related to steam generation or water flow
- Visible white or gray buildup around door seals, racks, or the cavity walls
- Unusual noises from the steam generator - popping, knocking, or hissing that wasn't there before
- Higher utility use as the unit works harder to produce the same amount of steam
- Reduced steam output even though the unit appears to be running normally
Any one of these on its own might not mean much. Several of them together, especially if they've crept up gradually, point straight at scale.
Water Treatment and Descaling Schedules
The best defense against scale is reducing the mineral load before it ever reaches the equipment. A water filtration or softening system sized for your kitchen's combi oven and steamer can cut scale formation dramatically. This is equipment your supplier or a qualified technician should size based on your actual water hardness and the manufacturer's specs for the unit - guessing at a filter size wastes money either way.
On top of filtration, every combi oven and steamer needs a regular descaling routine. Most manufacturers build automatic or semi-automatic descaling cycles into the unit, and many units will prompt you when a cycle is due. Staying on that schedule - rather than waiting until problems show up - is what actually protects the steam generator and heating elements. A kitchen running a unit hard, multiple shifts a day, needs more frequent descaling than one running light use. Follow the manufacturer's recommended interval for your specific water conditions and usage, not a one-size-fits-all guess.
Routine descaling with the manufacturer-approved solution, done on schedule, keeps mineral buildup from ever reaching the point where it affects performance.
When It's Time to Call a Tech
Basic cleaning and manufacturer-approved descaling cycles are things kitchen staff can typically handle as part of daily and weekly routines. But there's a line past that point. If you're seeing error codes, reduced steam output after descaling, unusual noises, or any sign the steam generator or heating elements themselves are affected, that's a job for a licensed technician. Steam generators, electrical components, and heating elements inside a combi oven are not safe to service without the right training and tools, and trying to force a fix on scaled-out internal components can turn a maintenance issue into a full equipment failure.
A technician can also inspect parts you can't see during routine cleaning - checking for scale in places that don't show from the outside and verifying your water treatment setup is actually matched to your equipment and usage.
Protect the Investment
A combi oven or steamer is a serious piece of equipment, and scale is the kind of problem that's cheap to prevent and expensive to ignore. Water treatment sized correctly, a descaling schedule that's actually followed, and a technician brought in when symptoms show up are what keep these units running for years instead of months.
If your combi oven or steamer isn't performing like it used to, or you want help setting up water treatment and a descaling plan that fits your kitchen, give Commercial Service Company a call at 501-548-2374. We've been serving kitchens across Conway, Little Rock, Benton, Bryant, Maumelle, Jacksonville, Searcy, Russellville, and the rest of central Arkansas since 1976.