Have you ever tried turning off and draining the hot water heater to fix a leak, only to find that when you turn on the hot water, it doesn't work?
Steps
Method 1 of 2: Primary Method
Remove an Airlock from Your Hot Water System Step 1
Step 1. Make sure the hot water heater is on
Remove an Airlock from Your Hot Water System Step 2
Step 2. If the cold water works well, but the hot water doesn't, or comes out slowly and then stops, then you may have an air lock, which happens when the air in the pipes is not displaced by the hot water and therefore blocks the tube itself
Remove an Airlock from Your Hot Water System Step 3
Step 3. Get a piece of water pump (approx. 60 cm) and some duct tape
Remove an Airlock from Your Hot Water System Step 4
Step 4. Use the tape and pump to connect the cold water tap to the hot water tap
Remove an Airlock from Your Hot Water System Step 5
Step 5. Open the hot water tap
Remove an Airlock from Your Hot Water System Step 6
Step 6. Open the cold water tap for 3-5 seconds
Remove an Airlock from Your Hot Water System Step 7
Step 7. Make sure the air lock has been removed
Remove an Airlock from Your Hot Water System Step 8
Step 8. Check the hot water in another faucet
Remove an Airlock from Your Hot Water System Step 9
Step 9. Repeat steps 5-8 two or three times
Remove an Airlock from Your Hot Water System Step 10
Step 10. IF the hot water works, close all taps and remove the pump
Remove an Airlock from Your Hot Water System Step 11
Step 11. If not, call a plumber
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Method 2 of 2: Alternative
Remove an Airlock from Your Hot Water System Step 12
Step 1. Disconnect the blue hose from the back of the washing machine
Remove an Airlock from Your Hot Water System Step 13
Step 2. Disconnect the red hose connecting the washing machine to the hot water hose (ie the end that is not connected to the washing machine's hot water connection)
Remove an Airlock from Your Hot Water System Step 14
Step 3. Connect the end of the blue hose that was connected to the washer to where you just removed the red hose
Remove an Airlock from Your Hot Water System Step 15
Step 4. This will create a 'U' between the hot and cold water pipes
Remove an Airlock from Your Hot Water System Step 16
Step 5. Open the hot water tap
Remove an Airlock from Your Hot Water System Step 17
Step 6. Open the cold water tap for 3-5 seconds
Remove an Airlock from Your Hot Water System Step 18
Step 7. Make sure the air lock has been removed
Remove an Airlock from Your Hot Water System Step 19
Step 8. Check the hot water in another faucet
Remove an Airlock from Your Hot Water System Step 20
Step 9. Repeat steps 5-8 two or three times
Remove an Airlock from Your Hot Water System Step 21
Step 10. IF the hot water works, close all taps and remove the pump
Remove an Airlock from Your Hot Water System Step 22
Step 11. If not, call a plumber
!
Advice
Double check that the air lock has been removed at the end.
Similar techniques can be used using a shower mixer: Make sure that no more water comes out of the shower cone, for example by putting a plastic bag up around it.
Warnings
Hot water can burn, even if there is an air lock.
DO NOT use this method if you have a pump to pressurize the system that makes the shower go, etc.
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