DENVER — When a massive event center was being developed in Denver, planners had to contend with two existing 6-foot-wide sewer pipes that emptied into the river, creating an unsightly dilemma.

Geothermal heat exchangers almost always use condenser water or glycol as the heat transfer medium — and, sometimes, refrigerant. Wastewater heat recovery systems typically preheat domestic cold water ...

Climate Wastewater Heating A wastewater heat recovery system operates Tuesday, Dec. 2, 2025, at the National Western Center in Denver. (AP Photo/Brittany Peterson ...

DENVER — The largest wastewater heat recovery system in the United States has been launched at the National Western Center (NWC). NWC said the system is part of its goal to create a low-carbon campus ...

A wastewater heat recovery system operates Tuesday, Dec. 2, 2025, at the National Western Center in Denver. (AP Photo/Brittany Peterson) A wastewater heat recovery system operates Tuesday, Dec. 2, ...

A wastewater heat recovery system operates Tuesday, Dec. 2, 2025, at the National Western Center in Denver. (AP Photo/Brittany Peterson) DENVER (AP) — When a massive event center was being developed ...

DENVER (AP) — When a massive event center was being developed in Denver, planners had to contend with two existing 6-foot (1.8 meters) wide sewer pipes that emptied into the river, creating an ...