Thanx greenjeepster.
Informative video. Even though I had one of those thermostats in my box of spares, I never had to replace mine. A look at the internals of the system really helps.
Anyone looking to get rid of one of the fuel burning coolant heater w/ circulation pump that Bjorn mentioned above?
On a related topic: Water is a pretty neat material too.
It goes from it's least dense gas phase, cools to a denser liquid phase, then cools even more but becomes less dense again. Unlike all the other liquids on this world.
Good thing it does too. otherwise all the frozen ice on ponds would sink, squish the fish, push cold water to the top to freeze until all the water in the pond was frozen.
Then it would take nearly forever for the heat to melt the lowest portions of the ice. And the bottom layers of ice would grow thicker and faster every winter season.
Instead the ice floats on the denser water and through thermal equaliberation drains the heat away from the earth, through the water so it can fully melt as the warmer temps return.