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Tefal Blendforce II BL420840 review

No. 4 of 10 in our blenders ranking · Updated · How we rank

Our verdict: The Tefal Blendforce II BL420840 ranks 4th of the 10 blenders we compare, with 8.6 out of 10. It takes our Value for Money badge.

Tefal Blendforce II BL420840

8.6/10Value for Money

The Tefal Blendforce II BL420840 is a 600W jug blender with a 2-litre plastic jug and four stainless steel blades. It suits families who want smoothies and shakes in batches without paying for a powerful motor.

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Why it's here

  • 2L jug for batches and family smoothies
  • Four removable stainless steel blades
  • Jug, lid and blades are dishwasher safe
  • Rotary dial with two speeds and pulse

Keep in mind

  • Only two speeds
  • Plastic jug can hold onto odours and stain
  • Noisy on ice

Why the Tefal Blendforce II BL420840 scores 8.6

Each bar shows where it places among the 10 blenders in this guide, so a full bar is 1st of 10. How happy owners are counts for most of the score.

  • How happy owners are5th of 10
  • How many rated it3rd of 10
  • How new it is7th of 10

Level with the Ninja Foodi Power Nutri Blender 2-in-1 CB100UK

The Ninja Foodi Power Nutri Blender 2-in-1 CB100UK and the Tefal Blendforce II BL420840 score the same, so either is a safe pick. The Ninja Foodi Power Nutri Blender 2-in-1 CB100UK goes first because it is the newer design.

About the Tefal Blendforce II BL420840

The BL420840 has a 600W motor and a tapered plastic jug. Total capacity is 2 litres, and Tefal gives the working capacity as 1.25 litres. Four stainless steel blades use Tefal's Trip'Ax design, and they come out of the jug for cleaning.

Controls are a rotary dial with two speeds and a pulse setting. There are no programs. Tefal lists an ice crush function in the product text. The lid has a filling hole with a dosing cup for adding ingredients while the motor runs.

Safety and stability get some attention. A Secure Lock System stops the blades spinning when the jug is unlocked, four suction feet hold the base on the worktop, and an air cooling system guards against overheating. The cord is 1 metre long. Tefal supplies a user manual and safety instructions as PDF downloads on its product page.

What owners report about the Tefal Blendforce II BL420840

Owner feedback specific to this model is limited, and what exists mostly covers early use. Those who have written about it say it is more capable than its power rating suggests, and that it blends smoothies and soups smoothly. Several mention that it comes apart easily, so the jug and blades are simple to wash.

Some owners say the lid seals well and the base stays put. Others call it good value for the money.

The one complaint that appears is noise: an owner found it too loud, though another said it was no louder than other blenders. Owners on Tefal's own shop say it crushes ice well, but those reviews are on the brand's site. No owner reports on long-term durability, staining or smells for this model turned up.

Who the Tefal Blendforce II BL420840 suits

The BL420840 suits a household that makes family-sized smoothies, shakes and soups and wants a simple jug with a dial. The removable blades and dishwasher-safe parts keep cleaning easy. Remember that the working load is 1.25 litres, not the full 2.

It is less suited to anyone who wants fine control, since there are only two speeds and pulse, or who minds a plastic jug. The Morphy Richards Total Control Glass Jug Blender 403010 has a glass jug and five speeds. For more power and a single-serve cup alongside a jug, look at the Ninja 2-in-1 Blender with Auto-iQ BN750UK.

Questions about the Tefal Blendforce II BL420840

Where can I find the Tefal BL420840 manual?

On Tefal's UK product page for the Blendforce II BL420840, which offers the user manual and safety instructions as PDF downloads.

How powerful is the Tefal Blendforce II BL420840?

It has a 600W motor. It is not a 1200W blender.

Can the Tefal BL420840 crush ice?

Yes. Tefal lists an ice crush function and the four blades are built for it. Expect it to be loud.

Is the Tefal BL420840 jug glass or plastic?

Plastic. Tefal lists the jug as plastic with a 2-litre total capacity and 1.25 litres working.

Is the Tefal BL420840 dishwasher safe?

Partly. Tefal lists the jug without its blades, the lid and the dosing cup as dishwasher safe. The blades are removable.

Other blender picks

The other badge winners in our blenders ranking.

All 10 blenders, compared

  1. 1 Ninja 2-in-1 Blender with Auto-iQ BN750UKBest Choice 9.1 Check Price
  2. 2 nutribullet Blender 900 Series 9.0 Check Price
  3. 3 Ninja Foodi Power Nutri Blender 2-in-1 CB100UK 8.6 Check Price
  4. 4 Tefal Blendforce II BL420840This reviewValue for Money 8.6 Check Price
  5. 5 Ninja 700W Slim Blender & Smoothie Maker QB3001UKS 8.6 Check Price
  6. 6 nutribullet Blender 1000W 8.4 Check Price
  7. 7 Philips 3000 Series Blender HR2041 8.3 Check Price
  8. 8 Russell Hobbs Food Collection Jug Blender 24610Best Budget 8.1 Check Price
  9. 9 Morphy Richards Total Control Glass Jug Blender 403010 7.9 Check Price
  10. 10 Breville Blend Active Personal Blender VBL246 7.9 Check Price
See the full blenders ranking

The Tefal Blendforce II BL420840 on Amazon

Tefal Blendforce II BL420840

The Tefal Blendforce II BL420840 is a 600W jug blender with a 2-litre plastic jug and four stainless steel blades. 8.6 out of 10.

Check Price on Amazon

How we score it

Every score here comes from our ranking model; no editor sets the order. Too few review sites cover blenders for their verdicts to lead, so this ranking is led by owners. It ranks products by how happy owners are, holding back any product few owners have rated until more agree. How many rated it and how new it is only settle close calls, and value for money earns its own badge rather than a higher place. We compared 22 models for this guide before settling on these ten.

Brands can't pay to be included or to move up. We last checked these picks in October 2026.

How we rank, in full

Where these facts come from