Double Boiler Method: Stovetop Infusion Guide
The classic stovetop double boiler technique for infusing butter and oil with plant material. No special equipment needed — just two pots, patience, and a thermometer.
Guide Notes
BatchCraft Editorial Team
Chaady Research Desk
Content is written for educational recipe-planning use and cross-checked against the calculator, recipe gallery, and process guidance already published on the site.
Updated March 13, 2026
Recipe and planning pages are designed to work with the BatchCraft calculator workflow, including serving-size assumptions, prep notes, and batch-planning helpers.
What Is a Double Boiler?
A double boiler is a stovetop setup where a smaller pot or heatproof bowl sits on top of a larger pot of simmering water. The steam from the lower pot gently heats the upper container, providing indirect, even heat. This prevents the carrier fat from overheating or scorching, which is the main risk of direct-heat stovetop infusions.
You can buy a purpose-built double boiler set, but most people simply use a saucepan with a heatproof glass or metal bowl that sits on top. As long as the upper container does not touch the water below, the principle works the same way.
Why Use a Double Boiler?
- No special equipment required — uses standard kitchen pots and bowls
- Self-limiting temperature: steam from boiling water caps the heat at approximately 212°F (100°C) at the water surface, but the upper pot typically stays at 160–185°F (71–85°C)
- Visual monitoring: you can see the carrier and material throughout the process
- Easy to adjust heat in real time by raising or lowering the burner
- Works well for small and medium batches
Step-by-Step: Double Boiler Infusion
- 1Decarboxylate your source material first using your preferred method (oven at 240°F for 40 minutes is standard).
- 2Fill the bottom pot with 2–3 inches of water. Place it on the stove over medium heat and bring to a gentle simmer (not a rolling boil).
- 3Place your carrier fat (butter, coconut oil, olive oil) in the upper pot or heatproof bowl. Use at least 1 cup for manageable infusion.
- 4Set the upper container on top of the lower pot. Make sure the bottom of the upper container does not touch the water.
- 5Once the carrier fat has melted, add your decarbed material. Stir gently to combine.
- 6Reduce heat to maintain a gentle simmer in the lower pot. Insert a probe thermometer into the carrier — aim for 160–180°F (71–82°C).
- 7Infuse for 2–3 hours, stirring every 20–30 minutes. Check the water level in the bottom pot periodically and add more water if it gets low.
- 8After infusion, remove from heat and let cool for 10–15 minutes.
- 9Strain through cheesecloth or a fine mesh strainer into a clean glass container. Squeeze gently to extract all infused carrier.
The bottom pot will lose water to evaporation over the 2–3 hour infusion. If the water boils dry, you lose the temperature buffering effect and the upper pot may overheat rapidly. Check every 30–45 minutes and top off with hot water as needed.
Temperature Management
| Carrier Fat | Target Infusion Temp | Max Safe Temp | Notes |
|---|---|---|---|
| Butter | 160°F / 71°C | 180°F / 82°C | Milk solids burn above 180°F — use ghee for higher temps |
| Coconut Oil | 170°F / 77°C | 190°F / 88°C | Handles higher temps well |
| Olive Oil | 170°F / 77°C | 190°F / 88°C | Extra virgin has lower smoke point — use light olive oil |
| MCT Oil | 170°F / 77°C | 190°F / 88°C | Extracts efficiently due to smaller molecular chain |
| Ghee (Clarified Butter) | 175°F / 80°C | 200°F / 93°C | No milk solids to burn — more forgiving |
Pros & Cons
- PRO: Zero equipment cost — uses pots and bowls you already own
- PRO: Good temperature control via steam buffering
- PRO: Easy to visually monitor the infusion
- PRO: Works well for small batches (1–2 cups)
- PRO: Familiar technique for anyone who has cooked with a double boiler before
- CON: Requires active monitoring — cannot walk away for long periods
- CON: Water level must be checked and maintained
- CON: Produces noticeable odor — no sealed chamber
- CON: Less precise than sous vide or dedicated devices
- CON: Risk of steam burns when handling the upper pot
Tips & Common Mistakes
The water in the bottom pot should barely simmer — you want to see gentle bubbles along the edges, not a vigorous boil. A rolling boil produces too much steam and can push the upper temperature too high.
A probe or instant-read thermometer is essential. Without one, you are guessing at the carrier temperature. Aim for the 160–180°F range and adjust the burner to maintain it.
- Do not let the upper pot touch the water — it defeats the purpose of indirect heating
- Stir regularly but gently — vigorous stirring breaks down material and creates bitter chlorophyll flavors
- If using butter, add a tablespoon of water to prevent the milk solids from sticking to the pot
- Do not cover the upper pot with a tight lid — condensation can drip back and cause splatter
Efficiency & Expected Results
The double boiler method typically achieves 60–75% infusion efficiency. This is comparable to the slow cooker method, but with the advantage of more direct temperature control. If you maintain consistent temperatures and stir regularly, you can push toward the higher end of that range.
Use the "Standard" efficiency preset when calculating with a double boiler method. If you are using a thermometer and confident in your temperature control, you can edge toward the "Optimistic" setting, but "Standard" is the safer bet for most users.
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