78.4/100Our Score
#1 of 1 in its comparison group
Value (price per oz)reference product — only one in its category, so it sets the bar
40.0/40
Amazon rating4.6★ · 19547 ratings
18.4/20
Amazon Best Sellers Rankreference product — only one in its category, so it sets the bar
10.0/10
Certificationnone declared
0.0/20
Direct Saleships from and sold by Amazon.com
10.0/10
One index — value, Amazon rating, Best Sellers Rank, certification, declared caffeine and direct sale — replaces separate price/stars callouts. See how it's calculated; it's not an independent lab test.
Accessory
Cosori Gooseneck Electric Kettle with Temperature Control, 0.8L
Cosori
$69.99
captured 2026-09-14 · price is a snapshot, confirm on Amazon
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Pros
- Precise temperature presets — useful since guayusa calls for a full rolling boil while other teas need cooler water
- 4.6★ across nearly 20,000 ratings
- Stainless steel interior, no plastic contact with water
- 60-minute keep-warm function
Cons
- Higher price point than a basic kettle
- 0.8L capacity — best for 1-3 servings at a time
Ideal for: Someone who brews more than one type of tea and wants one kettle that hits the right temperature for each.
Nearly 20,000 ratings averaging 4.6★ — reviewers highlight the precise presets and fast heat-up time.
Full profile — added and verified directly on the live Amazon listing 2026-09-14.