Several years ago, I got a call from an HVAC contractor in southern Minnesota who was troubleshooting a radiant system for a residential customer. Since he wasn’t really confident working with radiant, he called to see if I might shed some light on this job. Apparently, the customer was experiencing extremely high heating bills, and some of the rooms in the home were cold. He related that the boiler, pump and controls seemed to be working properly, so he wasn’t sure of the next ...

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