Why is my radiator cold at the top?

Trapped air. Bleeding it takes two minutes and restores full output.

Do you bleed radiators with the heating on or off?

Off and cooled. Hot systems spray scalding water.

atom · diy / heating

Bleed a radiator

draft · verifying asked 185 ways distilled today

Turn the heating off and let it cool.

Hot water under pressure will scald you. Twenty minutes is enough.
Find the radiators that need it.

Cold at the top and warm at the bottom means trapped air.
Open the valve a quarter turn.

Bleed key at the top corner, cloth underneath. Turn until you hear hissing.
Close it when water appears.

The hiss stops and a steady dribble starts. Close immediately.
Re-check the boiler pressure.

Bleeding drops it. Top up to the green zone, usually 1 to 1.5 bar.

0 of 5 done

1 Founder draft core @bernard ⚡ new

#1 becomes the Core. This atoma is young: submit a better distillation and take the seat.

No gear needed. Your pot, a timer and ice are enough. That is the point.

Founder draft

@bernard · challengers welcome

fanouts · the community votes where this atom ends

people ask · parameters live here, knowledge links out

Trapped air. Bleeding it takes two minutes and restores full output.
Off and cooled. Hot systems spray scalding water.

complexes

related atomas · same pillar

Shut off the water main fast Bleed hydraulic bike brakes Stop a nosebleed the right way Fix a running toilet Reset a tripped breaker safely Find a stud in the wall

the neighborhood · nearest by search-similarity

also asked as

how to bleed a radiator · radiator cold at top · bleeding radiators guide · radiator bleed key · radiator not heating up +185 phrasings, one home

The best media for this problem, one per channel

Best of YouTube How to Bleed Radiators 'Properly' Proper DIY · chapters pending alignment

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the concept

Why the web needs atoma

01 · The problem

Someone wants to do something: swing a kettlebell, cook bone broth, start investing, and wants the result, not the research project. Today they get the research project:

Noise over density. For every insightful answer, fifty padded or wrong ones. SEO rewards length; the reader wants the opposite.
Scatter. The same problem phrased a thousand ways across a thousand URLs, with no single home where the best insight accumulates.
Ephemerality. An answered question dies in the feed. The web has no mechanism for an answer to converge.

Wikipedia solved “what is X.” Nothing has solved “how do I do X.”

02 · The atom

Átomos: that which cannot be cut further. One canonical problem, one permanent URL, holding:

Core: the #1-ranked version: 3, 5 or 7 steps, ≤ 30 words each, democratically agreed. A step may fold out at most 3 sub-steps, one level deep, never more, and the core must stand alone with all of them collapsed. The constraint is the product: density is enforced, not hoped for.
Versions: competing distillations, crowd-voted. The winner becomes the Core.
One best per channel: every atom holds exactly one YouTube video, one TikTok, one Instagram post, one article: the best of each medium, voted like everything else. Channels are open-ended: loop/GIF, image, and podcast are channels too, and an empty channel shows a vacant seat until someone nominates its first champion. Challengers queue behind the champion, and dethroned champions stay attached as history: the atom remembers what used to be best. The best video is chaptered so every step plays its section, embedded from the source.
Fanouts: variants and edge cases. The community votes where this atom ends and a new one begins; atoms start with core elements and split only when a fanout outgrows them.

Every phrasing of a problem is an alias, not a new page: a thousand scattered questions collapse into one atoma. The alias graph is also a search-intent map.

03 · Machine-readable by design

Every atom is published twice: once for humans, once for machines. The page carries schema.org HowTo markup, and every atom is addressable as clean JSON: steps, sources, timestamps, vote counts, license. As AI assistants answer more “how do I” questions, atoma is the verified, citable layer they ground on: and every citation carries its sources with it.

04 · Vs. the field

Google ranks ten padded pages; atoma is the destination, not the directory.
Quora / Reddit scatter and die in the feed; an atom compounds forever.
WikiHow is padded and editorially closed; atoma is crowd-ranked and length-capped.
ChatGPT regenerates an unverified answer each time; atoma is the human-validated best-known-method.

05 · Brand

The mark is a true atom. Three orbits for the three democratic loops: steps, media, fanouts, around one nucleus: the problem. Three electrons run the orbits, each drawing its trail: the media in motion. The amber one is the current champion.

the atom ✓

nucleus-a

convergence

06 · The democracy

The democratic element is the product. Atoma borrows what works from Reddit and fixes what does not:

Up/down votes on versions, media champions, and fanout boundaries: one mechanic everywhere.
Credibility per topic, not global karma: win votes in fitness/technique, earn ⚡ technique. A cooking expert’s vote counts more in cooking, slightly: weighted, never gated.
Convergence, not feeds. Reddit’s votes rank an endless stream; atoma’s votes converge each atom toward one best answer. Winning writes history, not karma alone.

07 · The superlative template

Every atom carries the same snippet formula. The superlative is earned, not claimed: votes make “best” a measurable statement, so the snippet survives a second read:

Title (≤60): {Problem}: Best Way in {N} Steps ({votes} Votes)
Description (≤155): The best way to {problem}: {aliases} questions condensed into {N} voted steps. Plus the #1 video, article & loop. Community-verified, no scrolling.
Headings: one H1 = the canonical problem; every step an H2, verb first.
Schema: HowTo + VideoObject with per-step Clip timestamps + breadcrumbs: steps, chapters and the “best” claim are machine-checkable.

08 · MVP

One vertical (fitness technique), ~100 LLM-drafted and founder-verified atoms, alias search, voting, submit-a-version with the format constraint enforced. Success signal: the day a stranger’s version out-votes the founder’s, the mechanism works.

one-liner Atoma is unifying the web for action: one atom per problem, the most condensed, community-verified way to do anything.

Bleed a radiator

Turn the heating off and let it cool.

Find the radiators that need it.

Open the valve a quarter turn.

Close it when water appears.

Re-check the boiler pressure.

The best media for this problem, one per channel