How to Bleed Radiators

Introduction

Air trapped in your heating system is one of the most common reasons why radiators don't heat properly or heat unevenly. In Latvian apartment buildings, especially at the start of the heating season, bleeding radiators is an essential procedure that can significantly improve heating efficiency and reduce your bills.

Step by Step

1. 1

   Turn off the circulation pump or wait until the heating system has cooled down and the heat carrier has stopped circulating. This prevents additional air from being drawn into the system and allows air to accumulate at the top of the radiator, where it's easiest to release.

2. 2

   Prepare your work area - place a container under the radiator's bleed valve (usually located in the upper corner of the radiator) and keep a rag nearby. Air often escapes with some water, which may be dirty from system sediments.

3. 3

   Using a radiator key or flat-nose pliers, slowly open the bleed valve by turning it counter-clockwise. Listen carefully - you'll first hear a hissing sound of escaping air. Keep the valve open until the air sound stops completely.

4. 4

   When a steady stream of water without bubbles starts flowing instead of air, immediately close the valve by turning it clockwise. Keeping it open too long can cause significant water loss and pressure drop in the system.

5. 5

   Check the heating system pressure on the gauge (usually in the heat substation or near the boiler). Normal pressure is 1-1.5 bar. If pressure is too low, water needs to be added to the system. Repeat the procedure for all radiators, starting with those furthest from the heat source.