Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: what type of filter does this unit require?
Document: This is no big deal, but does require paying a bit of attention when you put the filter basket back on, as it needs to match up with a couple of hooks at the inner end.
That appeals to me. It just does what is necessary, and my desire is that when the time comes to make repairs, it will be possible to get replacement parts and keep it in service. I am hopeful that the simplicity of the unit will mean that it will be reliable over time.You should be aware that this machine is designed for Europe and does brew less than typical U.S. built coffee makers. It will brew 10 "European" cups, or 40 ounces of coffee.
MOST of the plastic is BPA free with the exception of the lid that fits over the collector, which is plastic #7. Another reviewer pointed out that 7 may or may not be BPA free. I have a feeling it is not, but a representative from the company advised the unit is BPA free. The Technivorm Website doesn't mention this one way or the other, and nothing in the literature says one way or the other. Based on the foregoing, I assume it is not.
Hayes Smartmodem styling from the 1980's.Glass Carafe or Thermal? I chose glass, and here's why: more options. The Technivorm has a warming plate that gently keeps the coffee at about 165 or 175, your choice via a simple rocker switch. It doesn't burn the coffee like the burner would on a cheap coffee maker. The glass carafe lets you see how much coffee remains, it's easy to pour, easy to clean, and doesn't require preheating.
Liked the taste of the coffee but too much plastic, glass carafe bumped filter every time it was put back on hot plate. Expected more durability for the price.
Have been drinking coffee for over 40 years (yes, I'm in my 60's). Have traveled all over the world, so lots of coffee. This device is not worth almost $300 - anything with a drip filter will work exactly the same. Add a carafe, and you have the same temperature control that is touted as the big selling point.
The other, newer filter basket is like a conventional coffee machine... with an automatic mechanism to stop the drip flow when you pull the coffee pot out.Not wanting to mess around with turning the drip off and on (...OMG no coffee! who forgot to flip the lever? or worse... why is there coffee overflowing everywhere!
It's so simple to make a pot of coffee now. The water tank is clearly marked and easy to pour into, the filter holder is large and easy to work with. I love cone-shaped filters, too. They make for good extraction. The copper heating element works very quickly and you can make a pot of coffee in no time at all.
Or just more steel? It's seriously baffling, given that they used copper for the heating coil. If it's a cost issue, why not offer an upgraded model?Most of the plastic parts are coded no. 5 (which is BPA-free). The exceptions are the resevoir lid and the filter-basket lid, which don't touch water or coffee directly but are in there collecting steam and then dripping it down into your coffee. Both parts are no.
As far as we could tell you can still buy both versions.The theory behind the lever (which has positions to turn the drip off, halfway, or full flow) is that you leave the drip off for a minute to fill the filter basket with water and thereby completely saturate the coffee grounds, then flip it to halfway if brewing a small amount of coffee, or to full if brewing a whole pot.
Answer: Any brand of V shaped #4 filter works.