I was wondering how do you know if the boiler needs to add water from the pipe or the boiler is already full of water?
if it is a water boiler there will be a pressure and temperature guage (PT) guage. it is a single guage with two readings. blue and red. look at the blue part and it should be reading around 18-20 psi. if it is under you can go to the fast fill which will be attached to your water line and have a lever on it and as filling just watch your guage. now the pressure relief valve is set to discharge at 30 p.s.i so this is why you keep your blue guage in the 18-20 range
Steam Boiler * Steam pressure gauge * Low water cut-out with water gauge glass Hot Water Boiler * Temperature and pressure gauge * Circulatory Both of these uses water. The steam boiler has a water gauge glass tube filled with water but to the 1/2 mark. This is one area where they don't have marking on it. Just 1/2 of the glass size in the middle you can mark it with a magic marker (black). The hot water boiler doesn't have this feature. With those boilers you don't have to check the water level. There should be a cold water intake value to add water to the water level on Steam Boiler. Also if you get your hot water for you hot/cold to take a shower, wash clothes, dishwasher, you might have the model that uses: Tankless coil domestic water heater - again these get filed with water automatically. The boiler will come on and off when the temp of the water is low. Settings 1 2 3 4-hottest on most tankless coil systems.
