I have a gas furnace that heats water. The water moves through the house in copper pipes to baseboard heaters in each room. I have three zones of piping with three thermostats on each floor (basement, main floor, top floor). It seems that my gas furnace cuts off too soon. It heats the water to a pleasant warm to the touch temperature and stops burning. It's pleasant but not enough heat to warm the house. The furnace used to heat the pipes to a "ouch thats hot" temperature. Is there another thermostat on the boiler itself? Does it need adjustment to make the gas burn longer and make the water hotter? Do I need a new thermostat? Am I on the right track at all here?
Steve.

Boilers with baseboard should run at 180F water temp. Problems heating individual zones may be due to air in lines or lack of flow from your pump. Also look at the presasure guage on the boiler,...Should be about 12psi. 12psi is pleanty of pressure for a house. 1psi will lift the water about1.23' above the fill valve.
Your problem could be air. all zones should be perged.

Thanks for the info.
As it turned out, one of the pumps was leaking water. This allowed air into the lines. After bleeding the lines and replacing the pump the thermostadt that measured the water temp to 180º stayed permanently unswitched suggesting the bugger was bad. I bypassed the switch by linking the wires and watched VERY carefully to see if all else functioned normally. Once I was assured that everything else worked well, I unhooked the wires so the waater would not boil. VERY IMPORTANT. Dangerous stuff. Bursting pipes. You get the picture.
Now the flew damper is acting up. On nights that become very cold where the furnace must heat the water to 180º, then shut down, then heat the water again when the water temperature reaches 140º, the damper does not open back up all the way. If its not open the switch doesn't close to turn the furnace back on. Looks like another replacement.
TY