Old Zhang in the boiler room: thirty years, never a cold night

Old Zhang's work logs, stacked up, come half as tall as a man after thirty years.

He is the boiler operator at the town's heating station, responsible for three residential buildings, a primary school, and a kindergarten. His hours run opposite to the town's: the coldest hours before dawn are his busiest — coal to shovel, water pressure to watch, return-water temperature to check. Three a.m. is the critical point of the heating curve. "Slip up at that hour, and the whole town wakes up to cold houses."

In thirty years, his logbook holds not one night when the heating fell short.

The town knows his name through a few stories. One year the boiler's fan broke and the replacement part would take three days to arrive — right during a cold snap. Old Zhang kept watch in the boiler room, hand-cranking the backup fan every two hours, sleeping on the bench at night. "The moment the furnace changes its voice, I'm awake." For those three days the town's radiators never dropped below sixteen degrees, not one night. Another year, on New Year's Eve, the heating main burst along the kindergarten section. Old Zhang and his son — home on break — dug through frozen ground at twenty below to repair it, restoring heat by four in the morning. "The children come to kindergarten in the morning. The rooms have to be warm."

Old Zhang has a habit: before every heating season he "walks" the whole pipe network. The routes, above ground and below, all live in his head. Which aging section tends to fail, which building's far end has poor circulation and needs adjusting ahead of time — he knows better than the blueprints. "A boiler is dead; heat is alive," he says. "And heat, you have to walk it along its own road, section by section, all the way into people's homes."

A boiler operator's year is spent mostly on a schedule built against human nature: the coldest days, the deepest nights. What carries him isn't the wage. It's knowing that "on the town's coldest days, everyone is waiting for my fire."

Old Zhang's boiler room is kept like a laboratory: tools sorted and ordered, labels on the valves, pipe diagrams and emergency procedures on the wall. He learned it from an old master: "A boiler room is not a place to make do. Be careless here by one degree, and a thousand households are colder by one degree."

The town has since switched to gas boilers, more automated, monitorable from a phone, and Old Zhang is near retirement. After an assessment, the station kept one post: duty engineer. They rehired him. The reason, written into the paperwork: "Thirty years of accident-free operation is this station's most important safety asset."

Old Zhang is now the living textbook for young boiler operators. His first lesson with an apprentice isn't in the boiler room; it's in the town: they walk door to door, and in homes with elders, they touch the radiator and feel its temperature. He tells them: "Our trade's thermometer isn't in the boiler room. It's in people's living rooms. Keep their rooms in your heart, and your hands won't be careless."

He also has the "Old Zhang rules," thirty years in circulation, posted on the wall of the new boiler room: one, check the water pressure at three a.m. without fail; two, when the temperature drops below minus ten, raise the return-water temperature two degrees; three, in any term when you hear the children coughing, burn the boiler one degree hotter. A young worker asked about the last rule. Old Zhang said: "When a child catches a cold, the parents' hearts twist. Make the room warmer by one degree, and the parents rest easier by one degree."