Opus hydronic heating equipment includes the G1 gas-fired and O1 oil-fired units. The G1 operates at 97%-99% AFUE, the company says, and the O1 (pictured) at 88%-90%. Each is available in three sizes and has an energy management control system and zoning panel. The piping and design of both products make them compatible with radiant floor heating or a snowmelt system.

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