How to How to Bleed Radiators
Cold spots in radiators mean trapped air. Learn to bleed radiators to restore heating efficiency and lower energy bills.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Turn On Heating System
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 1: Turn On Heating System
Turn heating on full. Let radiators warm up for 15 minutes. Feel each radiator - cold spots at top indicate trapped air.
2 Step 2: Turn Off Heating
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 2: Turn Off Heating
Turn off heating and wait 30 minutes for radiators to cool. Never bleed hot radiators - pressure can cause burns.
3 Step 3: Prepare Area
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Prepare Area
Place towel under radiator valve. Have container ready to catch water. Open windows if needed.
4 Step 4: Insert Key and Open Valve
Step 4: Insert Key and Open Valve
Insert radiator key into bleed valve (usually top corner). Turn counterclockwise 1/4 turn. You'll hear hissing air.
5 Step 5: Close Valve When Water Appears
Step 5: Close Valve When Water Appears
Once steady stream of water (no air bubbles), close valve by turning clockwise. Wipe dry. Repeat for other radiators.
6 Step 6: Check Boiler Pressure
Step 6: Check Boiler Pressure
Check boiler pressure gauge. Should be 1-1.5 bar. If low, top up using filling loop. Consult boiler manual for procedure.