# Best Tempeh Incubators and Proofing Boxes Source: https://fermentnest.com/best/best-tempeh-incubators Updated: 2026-10-06 Publisher: Ferment Nest. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://fermentnest.com/how-we-research#our-score Tempeh asks for something most kitchens do not have: steady warm air held for a day or more, with enough airflow that the beans do not overheat as the mould grows. Ovens with the light on and improvised boxes can work, but they drift. Purpose-built incubators and proofing boxes differ in temperature stability, whether they circulate air, how many trays or bags they hold, and how well they handle the humidity a tempeh batch produces. We looked at how tightly each unit held its set temperature, airflow, usable capacity, cleaning after a humid batch, and price against improvised setups. A thermostat-controlled proofing box suits anyone making tempeh regularly or also proofing bread. Heat mats with a separate controller are the flexible budget route inside a cooler or crate. Folding proofers store away easily in small kitchens, and larger cabinets suit batch cooks running koji too. ## Picks ### 1. FermentPro 12.8L Smart Fermentation Machine for Yogurt, Natto, Tempeh and Sourdough Our score: 8.6/10 (Fit for the job 9/10 · Features and specs 9/10 · Build and materials 8/10 · Value 8/10) FermentPro's 12.8L smart fermentation machine for yogurt, natto, tempeh and sourdough projects. Pros: - 12.8L chamber fits trays of tempeh or several yogurt jars at once - Smart controls handle the warm, steady heat tempeh needs - Multi-use machine covers natto and sourdough proofing too Cons: - Large machine takes serious counter or cabinet space - Smart features add a learning curve for first uses Details: https://fermentnest.com/product/B0FXXVNB9C ### 2. Bread Proofing Box 40L Electric Dough Proofer with Humidity and Temperature Control Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 9/10 · Build and materials 7/10 · Value 8/10) A 40L electric bread proofing box with humidity and temperature control, roomy enough for tempeh incubation. Pros: - Humidity and Temperature Control are ideal for tempeh mold growth - 40L space holds several tempeh bags or bread bowls at once - Electric proofer brings a steady climate to cold kitchens Cons: - Large box needs plenty of storage when not in use - Humidity settings take trial runs to dial in Details: https://fermentnest.com/product/B0DRRZ82WX ### 3. GRANURA HOME Bread Proofing Box, Sourdough Starter Warmer & Dough Proofer Our score: 8.1/10 (Fit for the job 8/10 · Features and specs 9/10 · Build and materials 7/10 · Value 8/10) GRANURA HOME's folding proofing box holds 50 to 130 F in 1 degree steps with three-sided 70 watt heating and a 0-99 hour timer or continuous mode, in a 16 x 12 x 12 inch space. Pros: - 50 to 130 F range in 1 degree steps spans the warm settings used for tempeh, natto and yogurt as well as dough. - Timer runs to 99 hours or continuously, long enough for incubations that outlast a 24 hour timer. - Side-wall thermostat with a probe that reads the air, plus a top window and humidity gauge for a look inside. Cons: - The listing is written mainly around bread proofing, so tempeh makers set their own temperature and timing. - 16 x 12 x 12 inches is a real countertop footprint when open, though it folds flat for storage. Details: https://fermentnest.com/product/B0H4151KSG ### 4. 40L Bread Proofer for Sourdough, Yogurt and Natto with Adjustable Temperature Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10) A 40L bread proofer with adjustable temperature for sourdough, yogurt and natto, usable as a tempeh incubator. Pros: - Adjustable Temperature makes it easy to hold tempeh-friendly warmth - 40L capacity fits multiple trays or bowls - Multi-use proofer covers sourdough, yogurt and natto Cons: - No humidity control is mentioned, so tempeh may dry out - Bulky unit is hard to store in small kitchens Details: https://fermentnest.com/product/B0FCS27ZTW ### 5. InnovifyHub Extra Large Dough Proofing Box50-130°F, 3-Sided Heat 24HTimer Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 7/10) InnovifyHub's extra large folding proofing box with 50 to 130 F control, heating on three sides, an NTC air sensor and a 24 hour countdown timer with buzzer. Pros: - Upper limit of 130 F, above the 113 F ceiling of many folding proofers, gives room for warmer incubations. - Front, back and bottom heating with 5 insulating layers, aimed at even warmth instead of bottom-only heat. - Interior is described as holding 2 large mixing bowls or several quart jars, with a viewing window and steel rack. Cons: - The timer tops out at 24 hours, so a tempeh run that needs longer has to be restarted by hand. - One of the pricier folding boxes in this guide, and the brand is not a well-known name. Details: https://fermentnest.com/product/B0FH16MBWT ### 6. FOHERE Bread Proofing Box, 32-113°F Temp Control & 48H Timer, Folding Dough Proofing Box With NTC Sensor, Sourdough Proofing Box For Sourdough, Pizza, Kombucha, Yogurt, Bread Baking Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 9/10) FOHERE's folding 34 liter proofing box with an NTC sensor, a top setting of 113 F and a 0-48 hour timer, a low-priced warm box for dough, yogurt and tempeh-range temperatures. Pros: - 0-48 hour timer covers an incubation longer than a day without resetting. - NTC sensor control with bottom heating and a 5-layer insulated wall, per the listing. - 34 liter interior collapses for storage and has a waterproof liner that wipes clean, plus a viewing window. Cons: - Maximum of 113 F, lower than the 130 F boxes in this guide, so there is less headroom at the warm end. - The listing shows two upper figures, 113 F in the title and 133 F in a bullet, so treat 113 F as the limit. Details: https://fermentnest.com/product/B0FLD7XTYL ### 7. UMJIGF 3.5L Natto Fermenter, Electric Natto Maker with Smart Panel Control Our score: 7.3/10 (Fit for the job 7/10 · Features and specs 8/10 · Build and materials 7/10 · Value 7/10) UMJIGF's 3.5L electric natto fermenter with smart panel control, adaptable for tempeh and other warm ferments. Pros: - Smart Panel Control makes setting time and heat straightforward - 3.5L capacity handles family-size natto batches - Enclosed design holds humidity that natto and tempeh like Cons: - Deep container is less ideal for flat tempeh trays - Lesser-known brand offers limited detail on long-term reliability Details: https://fermentnest.com/product/B0DZTF82S6 ### 8. Automatic Electric Natto Fermenter Maker 3.5L Stainless Steel for Yogurt and Tempeh Our score: 7.0/10 (Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 7/10) An automatic electric natto fermenter maker, a 3.5L stainless steel unit for natto, yogurt and tempeh. Pros: - Stainless Steel inner pot is easy to clean after sticky natto - 3.5L size handles a household batch of natto or yogurt - Automatic heat control keeps ferments in a narrow warm range Cons: - Pot shape is better for natto than flat tempeh cakes - Check the specifications for the exact temperature range before buying Details: https://fermentnest.com/product/B0GM9FLV18 As an Amazon Associate I earn from qualifying purchases.