My tea is weak since I moved somewhere high

In short

Water boils at a lower temperature as altitude rises, so ‘boiling’ stops meaning 100 °C. At 2,000 metres it is roughly 93 °C and at 3,000 roughly 90 °C, which is a real difference for black tea, dark tea and roasted oolong, and no amount of longer boiling raises it.

Likely causes, in order

Most likely first. Answer the question under each one before moving on — several of these look alike in the cup and are told apart only by what was done to the leaf.

1. 1. Boiling point is below what the tea needs

   Temperature

   Check: How high are you, and is the tea one that normally wants full boiling water?

   Fix: Extend the steep and increase the dose rather than chasing temperature. A black tea that wants three minutes at sea level may want four or five here, and boiling longer does not make the water hotter.

2. 2. Leaf that cannot be compensated for by time

   Leaf qualityInferred by TeaHQ, not established

   Check: Is it a compressed dark tea, a heavily roasted oolong or a tightly rolled tea?

   Fix: Boil these rather than steeping them. A simmer holds the leaf at the local boiling point continuously, which is the only way to give tightly compressed or heavily roasted leaf enough energy at altitude.

3. 3. The vessel is losing what heat there is

   Equipment

   Check: Do you preheat the pot, and is the room cold?

   Fix: Preheat the vessel and cover it. When the starting temperature is already low, the several degrees lost to a cold pot matter far more than they do at sea level.

4. 4. Green tea has quietly become easier, not harder

   Temperature

   Check: Has the green tea improved while the black tea got worse?

   Fix: Nothing to fix. Lower boiling point is an advantage for green, white and yellow tea — it is the teas that wanted full heat that suffer, and the ones that never did are now easier to get right.

Tea types this applies to

• Black tea
• Dark tea and pu-erh
• Oolong

Brewing methods this applies to

• Western brewing (teapot or mug) — A small amount of leaf in a large volume of water, steeped once for a few minutes and then strained off. The approach most English-speaking drinkers already know, and the one most teas sold in the West are made for.
• Boiling aged and dark tea (zhu cha) — Compressed or aged dark tea put into a kettle of water and brought to a simmer rather than steeped. It is a normal winter preparation for Liu Bao, aged shou pu-erh, brick tea and tea nuggets, and it is also what a gongfu session’s exhausted leaf is for.
• Boiling and decoction — Leaf, and usually other ingredients, simmered in water or milk rather than steeped — the basis of masala chai, butter tea and noon chai.

When this cannot be fixed

Water cannot be made hotter than its local boiling point in an open vessel, so a tea that genuinely requires 100 °C cannot be brewed as intended at altitude. Boiling the leaf is a workaround rather than an equivalent.

Related problems

Sharing a cause category, a tea type or a brewing method with this one.

• My tea goes cold before I finish it — The cup is lukewarm within a few minutes, and in a gongfu session the later infusions arrive noticeably cooler than the early ones.
• My clay pot has changed how the tea tastes — A tea that tasted right in porcelain comes out muted, differently scented, or carrying something that was not in the leaf.
• My second infusion is thin and watery — The first cup is good and the second has body but no flavour, or no body at all — thin rather than bitter.
• My first infusion is always the worst one — The opening cup is thin, dusty or flat, and the second is markedly better — consistently, across different teas.
• My teapot came out of the dishwasher damaged or tasting wrong — A pot or cup returns from a dishwasher cycle dulled, with faded decoration, a fine web of surface cracks, or a persistent taste that was not there before.

Sources