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I am converting a radiant floor system that was originally built to operate at main pressure (40-60psi). It is now a closed loop system set to operate at 15psi. The boiler loop pump I mounted horizontally. The zone pumps from the original installation (Taco cartridge type) were mounted...

I just finished installing an electric boiler for my radianf floor system. The boiler loop is 1-1/4" copper. All my solder connections are leak-free. I have two spots that the threaded connections leak past the teflon pasted threads. This is a low pressure (15 psi) system. What are my...