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System is running much better... Thanks jadnashua. I bumped the low temp on the control to 180°F and left the high limit at 200°F, maintaining the 20° differential required on the warning label. Now the system gets the house up to temperature much quicker. The circulator and burner rarely...

Okay... so I did some more research and thinking. Thanks for the suggestion of not taking things apart. I now realize that the boiler is probably adequate to heat the whole house including the basement. Something else was the problem. I discovered that the pressure in the system was only about...

Thanks jadnashua. How do I measure the supply and return temps? A thermocouple on the surface of each pipe, or do I need to measure the temp of the actual water flowing through by tapping the pipe somehow? Do you know if there is there a practical convention for measuring this? The boiler...

Hi All, I recently purchased an 1800 square foot house built in 1950 with a FHW by oil system that takes an extremely long time to get up to temperature... like 3-4 hours or more. The house has one single zone/loop. The radiators on the upper floors never really seem to get hot, just warm, even...