Tea from the office boiler or the hot tap never tastes right

In short

Two separate faults hide behind one symptom, and they pull in opposite directions. The water is usually not as hot as the label claims, which under-extracts; and it has usually been sitting hot for a long time, which changes it before it ever meets the leaf. The fix depends on which of the two you have, and it is often both.

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. The tap is not delivering boiling water

   Temperature

   Check: Does the water arrive without a rolling boil, and does it stop steaming almost immediately in the cup?

   Fix: Plumbed hot taps and wall boilers commonly deliver somewhere below boiling, and the drop between the tank and the cup is larger again. For black tea and roasted oolong that is the whole problem: those categories need water at or very near boiling to open at all. Preheat the mug, use more leaf, and extend the steep.

2. 2. The water has been held hot for hours

   Water chemistryInferred by TeaHQ, not established

   Check: Is it a tank that keeps a reservoir at temperature all day, rather than heating on demand?

   Fix: Long-held hot water is a different liquid from freshly boiled: dissolved gas has gone and, in a hard-water area, the reservoir has been concentrating and depositing minerals since morning. Draw off and discard a cupful first, which clears the standing water in the line, and accept that the tea will be flatter than at home.

3. 3. The reservoir is scaled and nobody descales it

   EquipmentInferred by TeaHQ, not established

   Check: Is there a visible film on the surface of the drawn water, or grit in the cup?

   Fix: Shared equipment is descaled far less often than a domestic kettle. There is not much an individual can do beyond reporting it, but it explains why the fault is constant and unresponsive to anything you change about the tea.

4. 4. The cup is cold and small

   Equipment

   Check: Are you brewing in a thin cold mug at the end of an already-cool pour?

   Fix: A cold mug takes a substantial bite out of water that was already below boiling. Rinse the mug with hot water first and pour it away. It is the single most effective thing available to you in a room where you do not control the boiler.

5. 5. The bag has been left in for the whole meeting

   Over-extraction

   Check: Is the tea stewed and bitter rather than thin — the opposite complaint?

   Fix: Then the temperature is not your problem and the timer is. Under-hot water and an abandoned bag produce entirely different faults, and it is worth being clear which you have before adjusting anything.

Tea types this applies to

• Black tea

Brewing methods this applies to

• Tea bag brewing — Pre-portioned tea in a permeable bag. The format was an accident of early twentieth-century sampling practice and became the dominant way tea is drunk worldwide, because it removes every decision except how long to leave it in.
• Mug infuser brewing — Loose leaf in a basket inside a mug — the most common way loose tea is actually made, and the method most often responsible for people concluding that loose leaf is not worth the trouble.

Related problems

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

• My tea tastes of chlorine, metal or the kettle — A chemical, swimming-pool or metallic note sits over the tea, and it is there whichever tea is brewed.
• There is an oily film on the surface of my tea — An iridescent or dull skin sits on the surface of a cup or pot, breaking into patches when disturbed and clinging to the side as the level drops.
• My tea gets drier and harsher as it cools — The first mouthful is balanced and the last one, several minutes later, grips the tongue and feels rough — from the same cup, with nothing added.
• I bought a water filter for my tea and it changed nothing — A filter jug or tap filter was bought specifically to improve the tea, and the cup tastes the same as it did before — with the same dullness, the same film and the same scale in the kettle.
• My milk curdles or separates in the tea — Flecks or threads appear when the milk goes in, or the surface breaks into small islands, and the drink looks grainy rather than smooth.

Sources