Five years ago, I visited a home to find out why they were not able to maintain 68°F during colder weather. Hot water baseboard was installed on the upper floor with radiant tubing embedded in concrete for the daylight basement area. An 80,000-Btuh modulating condensing boiler with a twisted-sister attempt at primary/secondary piping, no thermal mixing for the radiant zone, and an indirect water heater feeding into a live electric water heater.
In harm’s way: The customer's preferred option may not always be best
Hot water baseboard was installed on the upper floor with radiant tubing for the basement The venting was PVC and discolored due to the fact that there was no outdoor reset The boiler was bouncing off of its 195°F limit - no condensing for that modcon They did not like my price. A month ago, they called again... Installer No. 2 had corrected the primary/secondary piping and added mixing for the radiant zone A second 80,000-Btuh modcon had been added; but again no outdoor reset Now both boilers were being run as one and both were bouncing off their 195°F limit