Radiators Not Heating

A few cold radiators in a system that otherwise works usually points at something local and fixable, so call and name the rooms that stay cold.

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When this becomes an emergency

A room or two stays cold while the rest of the house comes up fine.
A radiator hammers or hisses sharply once the system fires.
The vent on a steam radiator is silent when it should be venting, or is spitting water.
A radiator warms at one end only and stays cold across the rest of it.

What a pro does

A single cold radiator rarely implicates the boiler. On the one-pipe steam systems that heat so much of the older housing stock here, a plugged or stuck air vent traps air in the radiator and steam simply never arrives, while the identical symptom on a hot-water loop usually means air needs bleeding or a valve has seized part way. Pitch matters too. A radiator that settled out of level as the floor under it aged holds condensate that can't drain back, and that's where the hammering starts, so a tech checks slope and vent function before touching anything expensive. The fix is often a small part and a shim.

Frequently asked questions

Why would only the upstairs rooms stay cold?

Steam reaches the farthest and highest radiators last, so undersized or clogged vents on that end starve those rooms while the near ones heat normally.

What is that hammering sound really?

Condensate sitting in a pipe or radiator that has lost its pitch gets hit by incoming steam. It sounds violent because it is, and it's a piping issue more than a radiator one.

Are old cast iron radiators worth keeping?

Generally yes. They hold heat beautifully and often outlast the boilers feeding them, and replacing them in a century-old house is a much larger job than correcting the actual fault.

Does covering a radiator make the room colder?

It can hurt output, especially when furniture blocks convection along the face, which is worth ruling out before assuming there's a mechanical fault in that room.

Radiators Not Heating?

Get connected with a local pro now.

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