Sun tea vs refrigerator cold brew
Both steep tea slowly in water that was never boiled, and they are often treated as the same idea with different equipment. The temperature at which each one sits is what separates them, and it separates them on flavour as well as on the reason public-health guidance exists.
brewing method
What is being compared
Why these get confused
The two get conflated because both are ‘tea made without boiling’. They are not equivalent: one is a slow cold extraction and the other is a slow warm one, and warm is the part that matters.
Point by point
| Aspect | Sun tea | Cold brew tea |
|---|---|---|
| Water temperature | Warmed by sunlight to somewhere around 30 to 40 °C. | Refrigerator cold, roughly 4 to 10 °C. |
| Time | Two to five hours in direct sun. | Six to twelve hours in the fridge. |
| What is extracted | Warm enough to bring out some of the bitter and astringent fraction alongside the sweet. | Cold enough that the sweet and savoury compounds come out and the harsh ones largely do not. |
| Consistency | Depends on the weather, the glass and where the jar sits. Two batches are rarely alike. | Highly repeatable, and forgiving — two extra hours change less than two extra minutes would in hot water. |
| Guidance | Several public-health bodies advise against the method, because the temperature band it sits in is the one in which micro-organisms multiply fastest. | Refrigeration keeps the water below that band throughout. |
| What it is good for | Nothing that cold brew does not do better, including flavour. | Green and white tea above all; roasted and dark teas give comparatively little. |
The short answer
TeaHQ records sun tea because readers ask about it, and states plainly that there is no flavour argument for it. The same jar, the same leaf and the same water in the fridge overnight is better on every axis.
Not a ranking. TeaHQ publishes no ratings and does not know your occasion.