[0:08] A boiler heats your home by pumping hot [0:10] water through radiators, causing them to [0:12] give off heat and warm the air around [0:14] them. Over time, [music] air bubbles [0:16] build up inside your radiators and [0:18] prevent the water from flowing smoothly. [0:20] [music] [0:20] This can increase your energy bills and [0:22] cause large temperature differences [0:24] throughout your home. Today, we'll show [0:26] you how to release these air [music] [0:28] bubbles by bleeding your radiators. [0:30] Before you start, you'll need a radiator [0:32] valve key. If you don't have one, you [0:35] can buy one for a few dollars [music] at [0:37] your local hardware store or online. [0:39] Most radiators use the same universal [0:42] radiator key. First, turn [music] off [0:44] the heat using the thermostat and wait [0:46] at least 30 minutes for the system to [0:48] cool. [music] This will protect you from [0:50] scalding water or steam and prevent new [0:52] air from being drawn into the radiators [0:54] while bleeding them. Next, [music] find [0:56] the bleed valve. Look at the top corner [0:58] of the radiator. You'll see a small [1:00] valve with a square [music] or a slot in [1:02] it. Place a towel or bowl under the [1:05] valve to catch any water that comes out. [1:07] To open the valve, insert [music] the [1:09] radiator key into the valve and slowly [1:12] turn it counterclockwise or to the left. [1:14] You may [music] hear a hissing sound. [1:17] That's the air bubbles escaping. [1:26] When the hissing sound stops and the [1:28] water starts to trickle out steadily, [1:30] [music] that means that the air bubbles [1:32] are gone. Turn the key clockwise or to [1:35] the right to close the valve tightly. [1:37] Repeat these [music] steps for all other [1:39] radiators in your home. Finally, turn [1:42] your heat back on using the thermostat. [1:47] Check that all radiators [music] are now [1:49] warming up evenly by carefully feeling [1:51] them at the top and bottom. Bleed your [1:53] radiators [music] once every year or [1:55] more often if the top of the radiator is [1:58] cool to the touch. Bleeding your [2:00] radiators can help you stay comfortable [2:02] and evenly heat [music] your home all [2:04] winter long.