5 Best Glass and PFAS-Free Air Fryers in the UK (2026)
If you’d rather not cook in a traditional non-stick basket, you’ve got two routes. Some air fryers swap the coated drawer for a glass container. Others keep the drawer but use a coating the manufacturer says is PFAS-free. They suit different kitchens, and once you look past the marketing the trade-offs are pretty clear.
I’ve picked five: three glass air fryers and two with PFAS-free coated drawers. This isn’t a hands-on test. Everything here comes from manufacturer specs, instruction manuals and UK retailer listings, and I’ve flagged it wherever those sources disagree.
Worth knowing first: a glass container doesn’t make the whole appliance coating-free. Both Ninja models come with separate crisper plates, which Ninja’s Canadian listing for the CRISPi describes as ceramic-coated aluminium. A PFAS-free non-stick finish is still a coating, too. None of these five is sold as coating-free, and none of them has been shown to be healthier to cook with.
Quick answer
- Best glass air fryer overall: Ninja CRISPi PRO (AS101UKGY). Adjustable temperature, seven functions and a 5.7L glass container.
- Best for large families: Cuisinart TriZone (AFT13XSSU). Three independent cooking zones and a PFAS-free claim from Cuisinart.
- Best-value PFAS-free dual-zone: Salter VertiCook Ultra (EK6642WHT). Two stacked 4.5L drawers for around £100.
- Best compact glass air fryer: Ninja CRISPi (FN101UK). Smallest footprint here, but you can’t set the temperature.
- Best budget glass-bowl option: Daewoo SDA2907 halogen air fryer. A 12L glass bowl for around £50, with more handling involved.
The best glass and PFAS-free air fryers at a glance
| Air fryer | Best for | Cooking surface | Capacity | Largest single space | Price checked | Score |
|---|---|---|---|---|---|---|
| Ninja CRISPi PRO AS101UKGY | Best overall glass option | Glass containers | 5.7L + 2.3L | 5.7L | £214.99 | 9.4/10 |
| Cuisinart TriZone AFT13XSSU | Large families | PFAS-free ceramic-coated interior | 13.6L across 3 zones | 5L (flat drawer) | £199.99 | 9.2/10 |
| Salter VertiCook Ultra EK6642WHT | Value dual-zone | PFAS-free coated drawers | 9L (2 × 4.5L) | 4.5L | £99.99 | 9.0/10 |
| Ninja CRISPi FN101UK | One or two people | Glass containers | 3.8L + 1.4L | 3.8L | £125.99 | 8.8/10 |
| Daewoo SDA2907 | Budget glass bowl | Glass halogen-oven bowl | 12L, or 17L with ring | 12L bowl | £49.99 | 8.4/10 |
Prices were checked on 15 October 2026 at the manufacturer’s own store or Currys and will change. Scores are our editorial judgement on material disclosure, usable capacity, cooking flexibility, everyday convenience and value. They aren’t lab results. The 8.4 Daewoo could easily be the right buy for someone with a small budget.
I’d look at the “largest single space” column first. Headline capacity adds every compartment together, so the 13.6L Cuisinart has no single space as big as the Ninja CRISPi PRO’s 5.7L container. If you often cook one large item, like a whole chicken or a full tray of roast potatoes, that figure tells you more than the total.
Glass vs PFAS-free coating: what’s the real difference?
It’s worth settling this before you look at individual models, because it narrows the list quickly.
| Glass (Ninja CRISPi, Daewoo) | PFAS-free coated drawer (Cuisinart, Salter) | |
|---|---|---|
| Main cooking surface | Glass container or bowl | Metal drawer with a non-stick coating the maker describes as PFAS-free |
| Other food-contact parts | Ninja’s crisper plates are a separate part, described as coated in Ninja’s overseas listings. Daewoo doesn’t document its rack material | Rack and plate materials are only partly documented |
| Cooking zones | One container cooks at a time | Two (Salter) or three (Cuisinart) independently controlled zones |
| Seeing the food | Straight through the glass | Cuisinart has windows and internal lights. Salter doesn’t list a viewing window |
| Handling | Hot glass needs oven gloves and care with sudden temperature changes | Familiar pull-out drawers |
| Cleaning | Ninja glass is dishwasher-safe. Daewoo’s bowl is hand-wash only | Drawers are dishwasher-safe on both. Keep abrasive pads off the coating |
| Leftovers | Ninja containers go from cooking to table to fridge with the supplied lids | Food has to move to another dish |
| Worktop space | Ninja units are the most compact here. Daewoo is bulky and needs room for its lid | Salter is narrow but tall. Cuisinart is 42cm wide |
One thing makes the choice easier. None of these five gives you glass and independent cooking zones. If what touches your food matters most, go glass and accept one zone. If you regularly cook a main and two sides at different temperatures, a coated multi-zone model will be easier to live with. Our guide to single vs dual air fryers goes into that choice in more detail.
Which one suits your household?
| Your situation | Best pick | Why | Watch out for |
|---|---|---|---|
| Living alone or a couple, mostly reheating and frozen food | Ninja CRISPi FN101UK | Compact, glass, dishwasher-safe containers | No temperature control |
| Couple or small family who cook from recipes | Ninja CRISPi PRO | Set your own temperature, 5.7L container | Only one container cooks at a time |
| Family of four or more cooking main and sides together | Cuisinart TriZone | Three zones finish together | 42cm wide and 10.9kg |
| Family on a budget or with a narrow worktop | Salter VertiCook Ultra | Two zones in a 29.3cm-wide body | Needs 38 to 39cm under wall cupboards |
| Tight budget, want glass, don’t mind extra handling | Daewoo SDA2907 | £49.99 for a 12L glass bowl | Hand-wash only and bulky to store |
1. Ninja CRISPi PRO 7-in-1 XL (AS101UKGY): best glass air fryer overall
Score: 9.4/10
The CRISPi PRO is the glass air fryer I’d point most people towards. Forget the drawer. You get two glass containers, a 5.7-litre one for main meals and a 2.3-litre one for sides or a quick lunch, and a heating unit that sits on top of whichever one you’re using. Food cooks, gets served and goes into the fridge in the same dish, with the supplied lids snapping on for storage.
Why I picked it
Two things separate it from the cheaper CRISPi. You can set the temperature yourself, up to 240°C on Max Crisp, which the original model doesn’t allow at all. And the 5.7-litre container is bigger than any single compartment in the 13.6-litre Cuisinart, so bigger batches fit in one go. Ninja says it serves up to six. Bake, Prove and Dehydrate sit alongside Air Fry, Roast and ReCrisp, and the adjustable base also takes Ninja’s 3.8-litre CRISPi container if you want a mid-size dish later.
There’s only one heating unit, though, so the two containers can’t cook at the same time. Chicken in the big one and veg in the small one means doing them one after the other. It’s £214.99 at the time of writing (RRP £264.99), which is a lot if you mostly do chips and frozen food. In that case I’d look at our best Ninja air fryers first.
| Specification | Detail |
|---|---|
| Model | AS101UKGY (Ash Grey) |
| Cooking containers | 5.7L and 2.3L glass |
| Rated power | 2,050W |
| Functions | 7: Max Crisp, Air Fry, Roast, Bake, Prove, Dehydrate, ReCrisp |
| Temperature | Adjustable, up to 240°C on Max Crisp |
| In the box | 2 crisper plates, 2 storage lids, adjustable base |
| Dishwasher-safe | Glass containers, crisper plates and lids (per Ninja) |
| Size and weight | 30 × 31 × 28cm (L × W × H), 5.17kg |
| Guarantee | 2 years |
| Price checked | £214.99 at Ninja, 15 October 2026 |
Pros and cons
- Adjustable temperature and seven functions, so standard recipes work
- 5.7L container is the largest single cooking space of the four drawer and container models
- Cook, serve and store in the same dish
- Ninja’s UK instruction guide states the containers are PFAS- and PTFE-free
- One heating unit, so only one container cooks at a time
- Hard to justify if you won’t use Bake, Prove or Dehydrate
- The glass stays hot for a while, so oven gloves are a must
- UK documentation doesn’t state the crisper plate material
Buy it if: you want glass as the main cooking surface, cook for up to four most days and like following recipes with set temperatures.
Skip it if: you need two foods cooking at different temperatures at the same time (look at the Cuisinart or Salter), or you mainly reheat and cook frozen food, where the cheaper FN101UK does the job.
Material note: Ninja’s UK instruction guide says the glass containers are PFAS- and PTFE-free. The crisper plates are a separate part. Ninja’s Canadian listing for the original CRISPi describes its plates as aluminium with a nano-ceramic coating made without PFAS or PTFE, but the UK pages I checked don’t spell out the plate material.
2. Cuisinart TriZone 13.6L (AFT13XSSU): best for large families
Score: 9.2/10
No glass here. The TriZone made the list because Cuisinart describes it as PFAS-free, and because nothing else in this guide copes with a full family dinner as well. You get two 4.3-litre air fryer baskets on top and a flat 5-litre oven drawer underneath, and each one is set independently.
Why I picked it
I like the bottom drawer most. It’s shallow, so it takes the food a deep basket struggles with: toast, a small pizza, fish fillets laid flat, a tray bake. The two baskets above get six functions each (Air Fry, Roast, Grill, Bake, Dehydrate and Re-crisp), with Sync to finish everything together and Match to copy one basket’s settings to the other. Windows and internal lights let you check progress without pulling drawers out. Cuisinart’s manual also gives a three-year guarantee without mentioning registration, the longest standard cover in this guide.
Don’t read too much into the 13.6 litres. It’s three compartments added up, and no one space is bigger than 5 litres. Physically it’s a big unit too, 42cm wide, 38cm deep and 10.9kg, so plan on leaving it out. Our large air fryers guide has bigger single-basket options if one large space matters more.
| Specification | Detail |
|---|---|
| Model | AFT13XSSU (Currys lists it as ATF13XSSU, item 10287626) |
| Layout | 2 × 4.3L baskets plus a 5L flat oven drawer, 13.6L in total |
| Rated power | 2,550W |
| Cooking modes | 9 across three zones. Baskets: Air Fry, Roast, Grill, Bake, Dehydrate, Re-crisp. Drawer: Pizza, Toast, Manual |
| Temperature | Up to 230°C |
| Cooking surface | PFAS-free per Cuisinart. Currys lists a PFAS-free ceramic-coated interior |
| Dishwasher-safe | Drawers and crisper plates (per the manual) |
| Size and weight | 32 × 42 × 38cm (H × W × D), 10.9kg |
| Guarantee | 3 years |
| Price checked | £199.99 at Currys, 15 October 2026 |
Pros and cons
- Three independently controlled zones for a main and two sides
- Flat 5L drawer suits pizza, toast and fish that deep baskets don’t
- Viewing windows and internal lights
- Three-year guarantee, the longest standard cover here
- No single space bigger than 5L, despite the 13.6L headline
- 42cm wide and 10.9kg, so it’s not one to move around
- At 2,550W it draws about 11A, so give it its own wall socket
- Coated, not glass, and accessory materials aren’t documented
- Showed as out of stock on Cuisinart’s own store when checked
Buy it if: you’re feeding four or more, regularly cook several parts of a meal at once and have the worktop space to leave it out.
Skip it if: you want glass, have a small kitchen, or often cook one big item, where the CRISPi PRO’s 5.7L container is roomier.
Material note: Cuisinart describes the TriZone as PFAS-free with an all-metal cavity, and Currys lists a PFAS-free ceramic-coated interior. The manual warns that abrasive cleaners will damage the finish but doesn’t say what the crisper plates are made of, so I wouldn’t assume they’re covered by the same claim.
3. Salter VertiCook Ultra 9L (EK6642WHT): best-value PFAS-free dual-zone
Score: 9.0/10
Think of a normal dual air fryer, then stand it on its end. At 29.3cm wide it takes up about as much worktop as a single-drawer model, yet you get two independently controlled 4.5-litre drawers and 9 litres in total. Salter lists both drawers as PFAS-free coated non-stick.
Why I picked it
For £99.99, half the TriZone’s price, you still get nine presets, including Sync and Match, and a 60 to 230°C range. Each drawer comes with a stainless-steel rack, which adds a second layer and gives you four cooking levels in total. Chicken thighs on one level and veg on the other works well, as long as you don’t pile it in, because crowded food crisps slowly whatever the machine.
Before you order, get the tape measure out. The unit is 37cm tall, and Salter’s page gives the clearance you need under wall cupboards as 38cm in one place and 39cm in another. Measure before you order and allow the larger figure. Early retailer reviews are positive, but there were only six when I looked, which isn’t enough to go on yet. For other options at this price, see our best air fryers under £100.
| Specification | Detail |
|---|---|
| Model | EK6642WHT (white) |
| Layout | 2 × 4.5L drawers stacked vertically, 9L in total |
| Rated power | 2,400W |
| Presets | 9, including Sync, Match and Keep Warm |
| Temperature | 60 to 230°C |
| Racks | One stainless-steel rack per drawer, four cooking levels in total |
| Cooking surface | PFAS-free coated non-stick drawers (per Salter). Coating type not stated |
| Dishwasher-safe | Drawers and racks |
| Size and weight | 37 × 29.3 × 42.8cm (H × W × D), 8kg |
| Under-cupboard clearance | 38 to 39cm (Salter gives both figures) |
| Guarantee | 1 year, or 3 years if registered within 30 days |
| Price checked | £99.99 at Salter and Currys, 15 October 2026 |
Pros and cons
- Cheapest dual-zone model here
- Two independent zones in a single-drawer-sized footprint
- Salter names both drawers as PFAS-free
- Stainless-steel racks add a second cooking layer
- Drawers and racks are dishwasher-safe
- Needs 38 to 39cm under wall cupboards
- Lower drawer sits close to the worktop, so expect to bend
- Salter doesn’t say what the PFAS-free coating is made of
- Only one year of cover unless you register within 30 days
Buy it if: you want two cooking zones and a PFAS-free coating for around £100, and your worktop is short on width rather than height.
Skip it if: you want glass, have low wall cupboards, or often cook one large item that won’t fit a 4.5L drawer.
Material note: Salter describes each drawer as a coated non-stick drawer and lists the model as PFAS-free. It doesn’t say what type of coating it is. The racks are plain stainless steel.
4. Ninja CRISPi 4-in-1 (FN101UK): best compact glass air fryer
Score: 8.8/10
This is the smaller, simpler version of the PRO. You get a 3.8-litre and a 1.4-litre glass container, a heating pod that sits on top, and four functions: Air Fry, Roast, ReCrisp and Keep Warm. That covers most of what one or two people need, and at roughly 25 × 30cm it has the smallest footprint in this guide. It’s also our premium pick in the best small air fryers guide.
Why I picked it
It’s the cheapest way into Ninja’s glass system. Ninja’s UK store had it at £125.99 when I checked, and the Family Set, which adds a second 3.8-litre container, was listed at the same price. Ninja shuffles its bundles a lot, so check which set is cheapest on the day. If a container ever breaks, a spare 3.8-litre one was £29.99 at Currys.
Here’s what puts some people off: you can’t set the temperature. Ninja’s FAQ for the FN101 confirms you can only change the cooking time, and each function runs at its preset heat. That’s fine for frozen food, leftovers and simple roasting. It’s less fine for recipes that call for a specific temperature, and our air fryer cooking times and temperature chart becomes guesswork with this model. That’s the main reason I’d stretch to the PRO.
| Specification | Detail |
|---|---|
| Model | FN101UK plus a colour suffix, such as FN101UKGY (Cyber Space), FN101UKST (Stone) or FN101UKSG (Sage) |
| Cooking containers | 3.8L and 1.4L glass |
| Rated power | 1,700W |
| Functions | 4: Air Fry, Roast, ReCrisp, Keep Warm |
| Temperature | Preset per function. Only the time can be changed |
| In the box | 2 crisper plates, 2 lids, adaptor |
| Dishwasher-safe | Containers, crisper plates, lids (top rack) and adaptor. Not the heating pod |
| Size and weight | 24.8 × 29.7 × 29.3cm (L × W × H), 5.08kg |
| Guarantee | 2 years |
| Price checked | £125.99 at Ninja, 15 October 2026 |
Pros and cons
- Smallest footprint of the five
- Ninja’s manual lists the glass as freezer-safe and microwave-safe
- Extra 2.3L and 3.8L containers are sold separately
- No temperature control at all
- 3.8L main container is tight for a family meal
- Only one container cooks at a time
Buy it if: you cook for one or two, mostly reheat, roast and cook from frozen, and want glass without spending PRO money.
Skip it if: you follow recipes with set temperatures or regularly cook for three or more.
Material note: Ninja’s UK page for the FN101UK makes no PFAS claim either way. Its Canadian listing says all food-contact surfaces are designed without PFAS and PTFE, while its Australian FAQ only describes the plate coating as PFOA-free, which is a narrower claim (more on that below). The wording changes from region to region, so if the crisper plate matters to you, ask Ninja UK directly.
5. Daewoo 17L Deluxe Halogen Air Fryer (SDA2907): best budget glass-bowl option
Score: 8.4/10
Strictly speaking, this is a halogen oven, a design that was around long before drawer air fryers. A lid holding the heating element and fan sits on a large glass bowl and blows hot air around the food. At £49.99 it’s by far the cheapest way to cook in glass in this guide, and the bowl is bigger than anything else here.
Why I picked it
The bowl holds 12 litres, and a 5-litre extension ring takes it to the 17 litres on the box. The ring only adds height, so think of 17L as room for a taller joint rather than more floor space. You get high and low racks, two mesh baskets, tongs, an oil spray bottle and a lid stand, plus simple temperature and 60-minute timer dials that switch off automatically.
You do pay for the low price in effort. The lid is heavy and hot and needs its stand, and the bowl is bulky to store. Daewoo’s manual also says neither the glass bowl nor the accessories are dishwasher-safe, even though a major retailer listing says otherwise. The manual’s built-in Wash setting helps: add about 3cm of water and a little washing-up liquid, set the timer for 10 minutes, and it loosens light mess. Our air fryer cleaning guide covers the rest.
| Specification | Detail |
|---|---|
| Model | SDA2907 (Daewoo’s own site lists the SDA2907GE) |
| Capacity | 12L bowl, 17L with the 5L extension ring |
| Format | Halogen countertop convection oven |
| Rated power | 1,200 to 1,400W (manual). Currys lists 1,400W, Daewoo’s SDA2907GE page 1,300W |
| Temperature | 65 to 250°C (SDA2907 manual). Daewoo’s SDA2907GE page says 125 to 250°C |
| Timer | 60-minute dial with automatic switch-off |
| In the box | Extension ring, high and low racks, 2 mesh baskets, lid stand, tongs, oil spray bottle |
| Dishwasher-safe | No. Hand-wash the bowl and accessories (per the manual) |
| Guarantee | 1 year, extendable to 3 years if registered within 28 days (per Daewoo). Currys lists 2 years |
| Price checked | £49.99 at Currys and Daewoo, 15 October 2026 |
Pros and cons
- Cheapest way to cook in glass here
- Largest cooking space of the five
- See the food through the bowl without lifting the lid
- Simple dials and plenty of accessories
- Hand-wash only, according to the manual
- Heavy hot lid, bulky bowl, and no PFAS or material details for the racks
- Power, temperature and guarantee details differ between Daewoo’s own sources and retailers
Buy it if: you want a big glass cooking vessel on a tight budget and don’t mind a bit more handling and washing up.
Skip it if: you want drawer-style convenience, digital presets or dishwasher cleaning, or you have limited cupboard space.
Specification note: the SDA2907 is sold under several closely related codes (SDA2907, SDA2907GE, and the similar SDA1032 appears in one retailer’s description). The manual for the SDA2907 gives 1,200 to 1,400W and 65 to 250°C. Daewoo’s SDA2907GE page says 1,300W and 125 to 250°C. Check the code on the listing, and register within 28 days if you want the longer guarantee.
What “PFAS-free” on the box does and doesn’t tell you
PFAS are a large family of man-made fluorinated chemicals. PTFE, the classic non-stick coating, is a fluoropolymer and counts as a PFAS under the widely used OECD definition. So a genuine “PFAS-free” or “PTFE-free” claim rules out a traditional PTFE coating. A few other things are useful to know.
- “PFOA-free” is a weak claim. PFOA has been banned under the persistent organic pollutant rules that apply in Great Britain since July 2020, so any compliant product should be PFOA-free anyway. A basket described only as “PFOA-free” may still have a PTFE coating.
- There’s no UK certification behind “PFAS-free”. The government’s PFAS Plan, published by Defra in February 2026, sets no specific rule for cookware and doesn’t introduce mandatory PFAS labelling. In April 2026 the Environmental Audit Committee urged a phase-out of PFAS in non-essential products including cookware, possibly from 2027, but nothing has changed in law yet. For now, “PFAS-free” is the manufacturer’s own claim.
- Claims usually cover named parts. Check whether it’s the basket, the container or the whole appliance being described.
| Air fryer | What the manufacturer says | What isn’t covered in the UK documentation |
|---|---|---|
| Ninja CRISPi PRO | Glass containers are PFAS- and PTFE-free | Crisper plate material |
| Cuisinart TriZone | PFAS-free, all-metal cavity. Retailer lists a ceramic-coated interior | Crisper plates and other accessories |
| Salter VertiCook Ultra | PFAS-free coated non-stick drawers, stainless-steel racks | What the coating is made of |
| Ninja CRISPi FN101UK | No PFAS statement on the UK page | Crisper plates (overseas wording varies) |
| Daewoo SDA2907 | No PFAS statement | Rack and basket materials |
None of this means glass or a PFAS-free coating has been shown to make your food healthier. If you’re weighing up the wider picture, our guide to whether air fryers are safe covers the evidence.
Looking after glass: what the manuals actually say
If you’re buying for the glass, read this bit. Ninja and Daewoo treat their glass very differently.
| Ninja CRISPi (FN101 series manual) | Daewoo SDA2907 (manual) | |
|---|---|---|
| Dishwasher | Yes: containers, crisper plates, lids (top rack) and adaptor | No: hand-wash the bowl and all accessories |
| Freezer or fridge | Containers are freezer-safe | Don’t refrigerate the bowl |
| Microwave | Containers yes, but never empty. Crisper plates no | Not covered |
| Oven, grill or hob | No | Not covered |
| Temperature changes | Don’t add cold food or liquid to hot glass, and don’t put hot glass on cool or wet surfaces | Never plunge the hot bowl into cold water |
| Damaged glass | Don’t use containers that have been dropped, chipped, cracked or badly scratched | Not covered |
The CRISPi PRO’s UK guide adds that its base protects worktops and that hot glassware needs oven gloves. I’d assume the FN101 rules apply to the PRO’s containers too, but check the guide that comes with yours.
Size, space and plug checks before you buy
Shape varies more than capacity across these five, so measure up first.
| Air fryer | Size | Weight | What to check |
|---|---|---|---|
| Ninja CRISPi PRO | 30 × 31 × 28cm (L × W × H) | 5.17kg | Space to lift the heating unit off the container |
| Cuisinart TriZone | 32 × 42 × 38cm (H × W × D) | 10.9kg | 42cm of width and a permanent spot |
| Salter VertiCook Ultra | 37 × 29.3 × 42.8cm (H × W × D) | 8kg | 38 to 39cm under wall cupboards |
| Ninja CRISPi FN101UK | 24.8 × 29.7 × 29.3cm (L × W × H) | 5.08kg | Very little |
| Daewoo SDA2907 | Not published in the sources I checked | Not published | Room beside it for the lid stand, and cupboard space for the bowl |
The plug matters too. Current is roughly watts divided by 230 volts, and most UK extension leads are rated at 13A, which is about 2,990W. Electrical Safety First advises never exceeding a lead’s rating and never plugging one extension lead into another.
| Air fryer | Rated power | Approximate current |
|---|---|---|
| Cuisinart TriZone | 2,550W | 11.1A |
| Salter VertiCook Ultra | 2,400W | 10.4A |
| Ninja CRISPi PRO | 2,050W | 8.9A |
| Ninja CRISPi FN101UK | 1,700W | 7.4A |
| Daewoo SDA2907 | Up to 1,400W | 6.1A |
Worked example: run the TriZone from a 13A extension lead and there’s only about 1.9A, or roughly 440W, left for anything else on that lead. A typical 3kW kettle on the same lead would take it well over its rating. With the two most powerful models here, use a wall socket where you can.
Running costs: what each one costs per session
Rated power tells you the most an air fryer can draw, not what it uses across a whole cook. Once it reaches temperature, the element switches on and off to hold it. So the figures below are ceilings: they assume each model runs flat out at its rated power for 20 minutes. Real use will usually be lower.
They use Ofgem’s average price-cap unit rate of 26.32p per kWh for 1 October to 31 December 2026 (England, Scotland and Wales). That rate reflects the government’s removal of VAT from electricity bills from 1 October 2026 to 31 March 2027, so expect it to rise when VAT returns, all else being equal. Standing charges are left out because you pay them whether you cook or not.
Calculation: rated power (kW) × time (hours) × unit rate (£ per kWh).
| Air fryer | Rated power | 20-minute ceiling | 20 minutes a day for a year (ceiling) |
|---|---|---|---|
| Cuisinart TriZone | 2,550W | 22.4p | £81.66 |
| Salter VertiCook Ultra | 2,400W | 21.1p | £76.85 |
| Ninja CRISPi PRO | 2,050W | 18.0p | £65.65 |
| Ninja CRISPi FN101UK | 1,700W | 14.9p | £54.44 |
| Daewoo SDA2907 | 1,400W* | 12.3p | £44.83 |
*Uses the top of the 1,200 to 1,400W range in Daewoo’s SDA2907 manual. At the 1,300W listed for the SDA2907GE, the 20-minute ceiling is about 11.4p. Annual figures assume today’s rate all year, which won’t happen, so use them to compare models, not to predict a bill.
Why the lowest wattage isn’t always cheapest: say a family meal fits in the TriZone in one 20-minute session (22.4p ceiling) but needs two 20-minute batches in the 3.8L FN101UK. That’s 40 minutes at 1,700W, or 29.8p. So the smaller machine costs more for that meal. It works the same way when you compare an air fryer with your main oven, which our air fryer vs oven guide works through.
Final verdict
If glass is the priority, the Ninja CRISPi PRO is the one I’d buy, mainly because it lets you set the temperature, which the cheaper CRISPi doesn’t. Its 5.7L container is also the roomiest single space among the drawer and container models here.
If you’re feeding four or more and want everything ready together, the Cuisinart TriZone is the better tool, even though it isn’t glass. The Salter VertiCook Ultra gives you most of that dual-zone convenience for half the price, as long as it fits under your cupboards.
The original CRISPi and the Daewoo suit smaller budgets or smaller households, each with one clear compromise: no temperature control on the Ninja, hand-washing and bulk on the Daewoo. Whichever you go for, check what the glass or PFAS-free claim actually covers before you buy.
Frequently asked questions
Are glass air fryers completely PFAS-free?
Not necessarily. Glass itself doesn’t need a non-stick coating, but crisper plates, racks and other parts can be made of different materials. Ninja’s UK guide says the CRISPi PRO’s glass containers are PFAS- and PTFE-free, but the crisper plates are a separate part. It’s worth checking each part separately.
Does PFAS-free mean there’s no non-stick coating?
No. A PFAS-free ceramic-coated basket is still coated. The claim describes what the coating is made without, not whether there’s a coating at all.
Is a glass air fryer better than a ceramic-coated one?
Neither is automatically better. Glass suits you if the material of the main cooking vessel matters most and you like seeing the food. Coated drawer models give you the familiar format and, in this guide, the only options with two or three independent cooking zones.
Can Ninja CRISPi glass containers go in the dishwasher, oven or microwave?
Ninja’s FN101-series manual says the containers are dishwasher-safe, freezer-safe and microwave-safe (never empty), but not oven, grill or hob-safe. The crisper plates are dishwasher-safe but shouldn’t go in a microwave or oven. Daewoo’s glass bowl is different: its manual says hand-wash only.
Can you set the temperature on the Ninja CRISPi FN101UK?
No. Each of its four functions runs at a preset temperature, and you can only change the cooking time. The CRISPi PRO lets you set the temperature yourself.
Is the Daewoo’s 17L capacity available without the extension ring?
No. The bowl on its own holds 12 litres. The 5-litre extension ring raises the lid to give 17 litres.
Which one is best for a family of four?
The Cuisinart TriZone if you regularly cook several parts of a meal at once. The Ninja CRISPi PRO if a glass cooking vessel matters more to you than independent zones. The Salter VertiCook Ultra if you want two zones on a smaller budget.
Are the running costs in this guide what I’ll actually pay?
They’re ceilings. They assume full rated power for 20 minutes at Ofgem’s October to December 2026 average rate. Real consumption is usually lower because the element cycles on and off, and your own tariff may differ.
Why don’t the editorial scores match retailer star ratings?
Our scores weigh material disclosure, usable capacity, cooking flexibility, everyday convenience and value. Retailer ratings reflect owners’ experiences. So the two won’t always match.
How I chose and scored these
This is a specification-led buying guide, not a hands-on test. I started with manufacturer product pages and instruction manuals for design, material and care claims, then used UK retailer listings to confirm exact model codes, prices and owner-feedback patterns. Where sources disagreed, as they do on the Daewoo’s power, temperature range and guarantee, I’ve shown both figures.
Material claims got the most scrutiny. For the glass models, I checked that the main cooking vessel is actually glass. For the coated models, I traced the PFAS-free claim back to the manufacturer. I checked accessories separately too. Information was checked on 15 October 2026.
