Buying a premium heat pump hot water system is exactly like buying a four-thousand-dollar espresso machine. You tell yourself it is an investment in a better life, a way to reclaim your mornings from the mediocre, burnt-bean sludge of the local petrol station.

You research the bar pressure. You learn about the PID controller that regulates temperature to the decimal point. You take photos of the stainless steel beast sitting on your benchtop and send them to the family group chat.

And then, eight months later, you realize you haven’t backflushed the group head or descaled the boiler once. You have treated a complex hydraulic machine like a toaster.

A Cold Tuesday in Berwick

It is a Tuesday evening in Berwick, the kind of July night where the air feels like it has been sharpened to a point. Michael is standing in the narrow side passage of his house, the one where the bins live and the weeds grow through the blue metal gravel.

He is holding a Maglite torch between his teeth, squinting at a weather-worn sticker on the side of a massive, sleek heat pump unit. This was his pride and joy four years ago. At a dinner party, he’d actually pulled

“How many new ones today?”

“Seventeen trials, three walk-ins, and a guy who forgot his credit card.”

7:14 p.m. on the second Monday of January at the academy in South Jersey. The air inside the room smells like heavy laundry detergent and fresh sweat. The mat is a crowded floor of stiff cotton. Diego stands near the brick wall. He is a blue belt with three years of mat time and a frayed collar.

He watches the head instructor, a man named Marcus, struggle with a stack of paper waivers. Marcus looks tired. He has not eaten since noon because the phone has not stopped ringing with New Year resolutions.

The Edge of the Mat

The class begins with a jog around the perimeter. It is a slow, bumping line of bodies. The newcomers wear borrowed gis that are too big in the shoulders. They move with a nervous energy. Diego finds a small patch of space in the back corner. He wants to work on his guard passing. He has been thinking about a specific hip switch for four days.

Marcus blows a plastic whistle. The sound is sharp.

“Everyone under six months, come to the center,” Marcus yells over the noise. “Blue belts and up, go to the far wall and drill your own stuff.”

Diego stares at his