Over the past week, I've noticed that the buzzing noise of our gas boiler circulator has gotten progressively louder. The boiler is in the basement, and when the thermostat calls for heat, you can hear the circulator kick on, even if you're on the second floor. I never noticed it this loud -- it was loud in the past, and when I asked a plumber about it, he said it was because the water was cool at first, but once the water warms up, the circulator's noise goes down as the hot water "lubricates" the circulator. But it's so loud now when the system kicks on, I'm wondering if something in the motor broke/stopped working, hence the louder motor buzzing noise. Can anyone help troubleshoot this problem? Many thanks in advance. FWIW, it's a Taco 007-F5.

We live in Iowa - so it gets below zero during the winter. We retrofitted a new boiler with baseboards to a 1918 home. We moved the house so we were able to pour a new foundation and put radiant floor heat in the basement. Boiler is in the basement. The basement stays warm always, often above the thermostat temp. The upstairs does OK also, but the main level sometimes can't make it to even 64 degrees. Each floor has its own thermostat and I have them programmed separately. My husband and I cannot agree on which is best or most efficient. Knowing that cold air goes down, I have the upstairs set at 64 during the day and 60 at night. The main level is set at the same as is the basement. We aren't upstairs during the day, the bedrooms are up there, but I thought it would be best to keep it at 64 up there because if lower than the main level, the cold air would travel down and make it harder to maintain the main level temp. The basement and upstairs can easily go from 60 to 64 in the morning, but the main level sometimes takes 3-4 hours to move up 4 degrees. My husband wants to leave the whole house at 64 all the time so we don't have this problem. I want to leave it set to lower at night to save money. It already cost us close to $600 to heat the month of December. We put in new windows and new insulation in the attic. Insulation was blown into the walls at some point in time - before we bought the house. Is this a boiler problem, do we need to blow in more insulation? I've never lived in a 2 storey before and don't know if that makes a difference. We're just cold and spending a huge amount of money on heating.