Which tool actually fits the valve, which one rounds the brass off, and the things people try that were never going to work.
How to Bleed a Radiator Without a Key
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Our latest Heating articles
Heating products for UK homes: controls and thermostats, radiators and valves, pumps, cylinders and the kit around a boiler.
Everything here is written by Nick Jolliffe, who spent 16 years running plumbers merchants across the south of the UK and a couple more with an independent merchant. Selling to the people who fit this equipment for a living tells you things a spec sheet does not: which brands come back, which ones fitters specify by name, and when the expensive option is genuinely worth it.
A word of caution on this category in particular. Anything involving a gas appliance or an unvented cylinder legally needs a Gas Safe or G3 registered engineer. These guides are here so you can have a competent conversation with the person doing the work, not so you can do it yourself.
No team, no payment for placement. Corrections are welcome.
Why Your Boiler Keeps Losing Pressure, and How to Find the Cause
A boiler that drifts down over months and one that empties within days are two different faults. Sort yours by how fast the gauge falls, then find the cause.
No Heating but Hot Water? How to Find the Fault Before You Call Anyone
Hot water fine but the radiators are cold? Route by boiler type first, work the six free checks that save a callout fee, and find out exactly where the job legally needs a Gas Safe engineer.
How to Balance Radiators, and How to Tell If You Need To
Balancing fixes radiators that all get warm but at very different rates. It does not fix a cold top, a cold bottom or a dead radiator. Work out which job is yours, then set each lockshield to an 11 to 12 degree drop working outward from the boiler.
Radiators Hot at the Top and Cold at the Bottom: What Actually Fixes It
Radiators hot at the top and cold at the bottom have magnetite sludge lying in the lower waterway, and bleeding will not shift any of it. Why the sludge is there, how to tell when it is not sludge, the three fixes in order of cost, and when a power flush is being sold to you for a job a garden hose would have done.
Central Heating Inhibitor: How Much You Need, and When to Top It Up
Fernox F1, Sentinel X100 and Adey MC1+ do not dose at the same rate, so a 500ml bottle does not mean the same thing across brands. How much inhibitor your system needs, what it costs per litre treated, and the six events that mean you need to top up.
MagnaClean and Central Heating Magnetic Filters: What They Catch, What They Miss and Which One Fits
MagnaClean is Adey’s brand name, not a category. What a magnetic filter actually traps, what it cannot touch, which size fits the space you have, and how often it has to be emptied.
Radiator Reflector Panels: The Honest Sums on What They Save
Radiator reflector panels only pay back on the right wall. Here is the arithmetic, the payback per radiator by wall type, and where the same money does more good.
How to Turn Off a Radiator, and Why You Should Rarely Turn It Fully Off
The two valves, what each one is actually for, the stuck pin that makes a TRV look broken, and why the frost setting beats zero in an unused room.
How to Bleed a Radiator, and What to Do When Bleeding Does Not Fix It
The five minute job, the order to do them in, and how to tell when the problem is not air at all.