Please help me understand the gas boiler system i have in my house. I just bought this house. It has super hot mini gas boiler. 4 zones. From which two are upstairs and two are basements. Flow going upstairs has circulator before it. I need to know how to purge the system aone of the basement is not getting enough heat. Can someone please tell me which levers are for what? And two drain points do what. It was hard to explain with pictures so i shot a video instead. [url]http://youtu.be/LoDmvrUZk3Y[/url] Thanks for help!

I have a Weil-Mclain oil fired boiler (probably around 15 years old). I've been in my home for 10 years and up until this winter, when I'd raise the temp on the thermostat in my living room to get the heat to kick on, I'd hear a click from the thermostat and then instantly hear the boiler kick on. This year, when I raise the temp on the thermostat, I hear the click, and then I hear the sound of water in the radiator pipes for about 8 - 10 seconds and then after that lag, the boiler kicks on. It does not do this all the time. Sometimes it kicks on instantly, but I'd say about 40% of the time I get that delay now. The boiler is well cared for, with annual maintenance done every November. I did notice this for the first time right after the last maintenance (with a new company I'd never used before). Anyone know what might be causing this and is it something to worry about? Also, a few times, when I get home from work and raise the heat from 62 to 65, the heat will kick on and run for a little while. Then I'll hear the boiler shut off and look at the thermostat and the temp in the house will be 63 or 64. After about a minute, the boiler will kick on again and stay on until the temp reaches 65. Again, it doesn't do this all the time. Maybe 15% of the time. Thanks for any help!!!