My cell phone buzzed and the excited caller said: “That new boiler you sold us is not working. Can you send someone over right away? We have no heat.”
I agreed and drove to the building. Once there, the building manager led me to the boiler room. The hydronic boiler, thought to be new, was 3.5 years old. Mounted on the front of the boiler were three similar- looking controls all set for the same temperature: 160° F.