Commercial Fryer Buying Guide: Oil Capacity vs Throughput
Quick answerAs a working rule, budget 1 litre of oil capacity for every 10–15 portions served per hour at peak. A twin-tank fryer isn't just double the capacity — it lets you run two products (say, chips and fish) without cross-flavouring the oil, which single-tank setups can't do.
A fryer that's slightly undersized doesn't fail outright — it just quietly drags your whole pass down. Oil temperature that hasn't recovered between baskets means longer cook times, greasier food, and a ticket queue that backs up exactly when you need speed most. Sizing one properly means matching oil capacity to your real peak-hour throughput, not your average day, and deciding early whether single or twin tanks fit how your menu actually runs.
Sizing oil capacity to throughput
Commercial fryers are rated by oil capacity in litres, and as a working planning rule, each litre of oil supports roughly 10–15 portions served per hour before recovery time between baskets starts stretching out. A fryer can typically turn out food at around 1.5–2x its oil capacity in weight per hour once it's holding temperature, so a 6L fryer comfortably handles a steady but modest counter, while anything approaching genuine chip-shop volume needs to move into 16L-plus territory.
| Oil capacity | Approx. throughput | Typical use |
|---|---|---|
| 6L | ~60–90 portions/hr | Café side-menu, low-volume snack counter |
| 10L | ~100–150 portions/hr | Small takeaway, steady lunch trade |
| 16L | ~160–240 portions/hr | Busy takeaway or pub kitchen |
| 30L | ~300–450 portions/hr | High-volume chip shop or QSR |
These are planning estimates based on general commercial fryer benchmarks, not a Keloo-specific test — actual throughput depends on product type, load size per basket and how consistently the thermostat holds temperature under load.
Single tank vs twin tank
A single-tank fryer is the simpler, cheaper option and works fine if your menu only fries one type of product, or if flavour transfer between items (chips one minute, battered fish the next) isn't a concern. A twin-tank fryer runs two independent oil baths side by side — the standard choice the moment your menu mixes something delicate (fish, chicken) with something the oil picks up flavour from easily, or when you simply need double the throughput without buying two separate units.
Compare Keloo's fryers
| Model | Capacity | Power | Format | Price |
|---|---|---|---|---|
| Double Fryer 2×6L | 2 × 6L | 5kW | Twin tank, countertop | £59.99 |
| 6L Single Fryer | 6L | 2.5kW | Single tank, countertop | £29.99 |
Keloo's range also includes 10L, 16L and 30L single and twin-tank freestanding formats for higher-volume kitchens — get in touch for current availability and lead times on those capacities.
Oil care & safety
- Filter daily on high-volume lines. Filtering oil at the end of each service (or mid-shift on a busy day) extends its usable life significantly and keeps food quality consistent.
- Watch for smoke point drop. Oil that starts smoking well below its rated temperature is breaking down — that's your signal to change it, not push it another day.
- Never mix old and fresh oil without filtering the old batch first — contaminants speed up the breakdown of the fresh oil too.
- Keep a lid or splash guard nearby for any water-contamination incident — water in hot oil is the single most common fryer safety hazard in a commercial kitchen.
Frequently asked questions
How do I know if my fryer is undersized?
The clearest sign is recovery time — if oil temperature doesn't return to set point between baskets during a genuine rush, and food starts coming out greasier or taking longer, that's throughput outrunning capacity, not a fault with the fryer.
Can I run a twin-tank fryer off a single circuit?
Check the combined wattage against your circuit rating before installing — a 2×6L twin tank at 5kW total is within a standard UK socket, but larger twin-tank freestanding units at 10kW+ typically need a dedicated circuit or three-phase supply.
How often should fryer oil be changed?
This varies hugely with volume and what's being fried — battered and breaded products break oil down faster than plain chips. As a starting point, high-volume lines often change oil every few days, while lower-volume counters can stretch to a week or more with daily filtering.
Is a countertop fryer as capable as a freestanding one at the same litre rating?
Broadly yes for cooking performance — the difference is mainly footprint and, at the larger end, typically a stronger element and sturdier build on freestanding units designed for continuous high-volume service.
Need a size not listed here?
Get in touch for current stock on 10L, 16L and 30L formats.
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