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I just bought a house built in 1964 with a hydronic system. The house seems reasonably tight for its age, but not well insulated. The boiler itself is only one year old (Dunkirk PWXL, standard efficiency). Question #1: should I consider adding an outdoor reset control, and what is the expected payback for doing so? There are three zones: two baseboard fintube, and one radiant. The radiant is in-slab copper tubing, that I believe is original. No leaks that I know of, and it heats well. I noticed that this system is piped with a single circulator (TACO 007) and three zone valves, but no mixing valve for the radiant zone. So, the floor can get as hot as the boiler high limit (in theory). This seems wrong to me, but as far as I can tell, it was designed this way from the beginning. There are neighbors with similar systems and they seem happy. Question #2: Should I worry about adding a mixing valve and separate circulating loop for the radiant zone, or just leave well enough alone?