The verdict
Buy the Anova Precision Cooker 3.0. Yogurt asks a circulator to do the easiest version of its job — hold roughly 110 °F (43 °C) dead steady for eight hours — and the machine that does it best is the one with the fullest published specification: Anova states a 0–92 °C range, ±0.1 °C accuracy, an 8 L/min pump and a two-year warranty, which is the longest here. The range is the quietly important part: 92 °C at the top means the same machine can also scald the milk at 82 °C before it incubates it, so the whole process happens in one vessel. Buy the Inkbird ISV-100W if you want to spend half as much: it publishes a 25–99 °C range, the same ±0.1 °C, a 15 L rated bath and an on-device screen. Buy the Anova Nano 3.0 if you incubate a few jars rather than a gallon — 850 W and a 7 L/min pump is plenty for a small bath, and it carries the same two-year warranty.
What this page will not tell you is that one circulator makes better yogurt than another. At this set point they are all operating well inside their published tolerances, and the differences below are about range, bath size, timer and accountability — not flavour.
Why a water bath is the right tool for this
Yogurt is a culture held at a temperature for a length of time. Too cool and it sets slowly and thinly; too warm and the bacteria you want are outcompeted or killed. The window people aim at is around 108–112 °F, and holding it for eight hours is precisely the problem an immersion circulator was designed for: a pump moves water past a heater and a thermistor so the whole bath sits at one temperature instead of stratifying.
Compare the alternatives honestly. An oven with the light on is a guess. A multicooker with a Yogurt program does the job well and is what most people should use if they already own one — our Instant Pot yogurt roundup lists which models actually have the button and the method page has the full sequence — but it heats a still pot from underneath with no circulation. A water bath with jars standing in it is more even than either, and it scales: four jars or twelve, same bath, same hold.
If you are new to the method at all, what sous vide is explains the mechanism and how to choose a sous vide machine is the general buying page this one sits under.
The specs that actually decide it
Published range, at both ends. The bottom end is a non-issue — every machine here reaches 43 °C comfortably. The top end is what matters, because scalding the milk to about 180 °F (82 °C) is the step that makes the finished yogurt thick rather than thin, and a circulator that can reach 82 °C can do that step too. Anova publishes 92 °C, Inkbird 99 °C, Wancle 90 °C — all sufficient. Breville publishes no temperature range for the Joule at all, which is why it is not ranked on this page.
Stated accuracy. Anova, the Nano and Inkbird all state ±0.1 °C. Wancle states the same figure as its own unverified claim. At a 43 °C set point none of those tolerances is the limiting factor; the reason to care about accuracy here is what it implies about the control loop over an eight-hour hold, not about tenths.
Rated bath volume. This one is practical. Inkbird publishes 15 L, Wancle 20 L with a 4.5 cm minimum water depth, and Breville rates the Joule for vessels up to 10 gallons. Anova publishes a pump flow instead — 8 L/min on the full machine, 7 on the Nano — which is the same information from the other direction: more flow moves a bigger bath. Jars take up room, so a dozen half-pint jars needs a larger container than one steak ever will. Our container guide covers what to put the water in.
Timer length. Eight hours is a long hold by the standards of a steak and a short one by the standards of a brisket, so no machine here is troubled by it. Worth noting that Wancle is the only maker in our catalog that publishes a maximum timer figure — one minute to 99 hours 59 minutes — so it is the only one where the number is citable rather than assumed.
The three, on published figures
Manufacturer-published figures only. Price is deliberately absent — see the live figures on the cards above. | Anova Precision 3.0 | Inkbird ISV-100W | Anova Nano 3.0 |
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| Rated power | 1,100 W | 1,000 W | 850 W |
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| Temperature range | 0–92 °C (32–197 °F) | 25–99 °C (77–210 °F) | 0–92 °C (32–197 °F) |
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| Stated accuracy | ±0.1 °C | ±0.1 °C | ±0.1 °C |
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| Bath capacity | 8 L/min pump | 15 L rated | 7 L/min pump |
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| Works without a phone | Yes — touchscreen | Yes — dot-matrix screen | Yes — on-device controls |
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| Published warranty | 2 years | 1 year | 2 years |
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The “works without a phone” row is the reason the Joule is absent from the ranking despite being an excellent machine. It is app-only — no buttons, no screen — and an eight-hour overnight incubation is exactly the cook where you least want a dead phone or an app outage between you and the set point. That is a design choice rather than a defect, and our Joule review makes the case for it on cooks where it matters less.
The method, in a bath
Scald the milk to about 180 °F, either in a pot on the stove or in jars standing in the bath with the circulator set to 82 °C. Cool it to roughly 110 °F — a sink of cold water is quickest. Stir in a spoonful of live-culture starter per jar. Lid the jars loosely, stand them in the bath, set the circulator to 43 °C and the timer to eight hours, and go to bed. Chill the jars for a few hours before eating, because yogurt firms as it cools.
Two practical notes. The jars need to be weighted or they will float and tip — the same problem as a bag, and the fixes in the floating-bag guide apply. And cover the bath with a lid or a sheet of foil: an eight-hour hold loses real water to evaporation otherwise, which is also the single biggest lever on what the cook costs to run, as the running-cost page works through.
Who should buy what
If you do not already own a circulator or a multicooker and yogurt is a genuine reason you are buying: the Anova Precision Cooker 3.0, which will also do every steak, egg and brisket on this site and carries the longest warranty in the category. If budget is the constraint: the Inkbird, which gives up a year of warranty and 100 W and almost nothing else. If you incubate a few jars at a time: the Nano. If you already own an Instant Pot with a yogurt button: use it, and do not buy anything — the Instant Pot yogurt page tells you which models have it. A circulator is a better incubator; it is not better enough to justify a purchase you would not otherwise make.
And if the broader question is whether a circulator is worth owning at all, is sous vide worth it and the main roundup are the two pages to read.
