Slow Cooker vs Double Boiler for Infusions
Comparing the two most popular infusion methods head-to-head — temperature control, hands-on time, capacity, and which produces better results.
Editorial 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.
Published 2026-03-13
Recipe and planning pages are designed to work with the BatchCraft calculator workflow, including serving-size assumptions, prep notes, and batch-planning helpers.
Two Methods, Same Goal
The slow cooker and double boiler are the two most recommended infusion methods for home edible makers. Both maintain gentle, steady heat to extract active compounds into a carrier fat. But they differ in convenience, control, and batch size. Here's how they compare.
Temperature Control
The double boiler wins on precision. Water boils at 100°C (212°F), creating a natural temperature ceiling — the fat in the top bowl can never exceed that. A slow cooker's "Low" setting varies by model, typically 85-100°C (185-212°F), but some models run hotter.
If you use a slow cooker, verify its temperature with a thermometer the first time. Some models' "Low" setting runs as high as 110°C (230°F), which is too hot for optimal infusion.
Hands-On Time
| Factor | Double Boiler | Slow Cooker |
|---|---|---|
| Active monitoring | Every 10-15 min | Every 30-60 min |
| Water level checks | Frequent (evaporates) | None |
| Total infusion time | 2-3 hours | 4-6 hours |
| Can leave unattended | Not recommended | Yes (lid on) |
The slow cooker is clearly more convenient. Set it and stir occasionally. The double boiler requires more attention — the water in the lower pot evaporates and needs refilling.
Capacity & Batch Size
Slow cookers range from 2 to 8 quarts, making large batches easy. A double boiler is limited by the size of your top bowl — typically 1-2 cups of fat maximum. For making multiple batches at once, the slow cooker wins.
Extraction Efficiency
Both methods produce comparable results when used correctly. The slow cooker's longer infusion time compensates for its slightly less precise temperature control. Most experienced makers report no noticeable potency difference between the two.
When to Use Each
- Use a double boiler when: You want maximum control, you're making a small batch, or you want to finish in 2-3 hours.
- Use a slow cooker when: You want convenience, you're making a large batch, or you don't want to watch it closely.
- Either works for: Standard butter, oil, or any fat-based infusion.
The Verdict
For most home cooks, the slow cooker is the better choice. It's easier, more forgiving, and produces equally potent results. The double boiler is preferred by experienced makers who want precise control or faster completion.
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