Changing a hot water cylinder is a task best left to a qualified and licensed plumber. However, here's a simplified overview of the process involved, for informational purposes only. This information is not a substitute for professional advice.
DANGER: Working with electricity and plumbing can be dangerous. If you are not qualified, do not attempt this yourself. Serious injury or death can occur.
Steps Involved (General Overview):
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Safety First: Turn off the power! Isolate the electrical circuit supplying the hot water cylinder at the consumer unit (fuse box/circuit breaker panel). Double-check that the power is off using a voltage tester.
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Turn off the water supply: Locate the cold water inlet valve to the cylinder and shut it off.
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Drain the Cylinder:
- Open the hot water taps in your house to release pressure and allow air into the system.
- Attach a hose to the drain valve at the bottom of the cylinder.
- Run the hose to a suitable drain (outside, a large sink, etc.).
- Open the drain valve to begin draining the cylinder. This can take a considerable amount of time.
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Disconnect the Plumbing:
- Once the cylinder is empty, carefully disconnect the hot and cold water pipes connected to the top of the cylinder.
- Use appropriate wrenches and be prepared for some residual water to spill. Have towels ready.
- Important: Take photos of the pipe connections before disconnecting to help with reconnection.
- Be extremely careful not to damage any fittings or pipework.
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Disconnect Electrical Connections:
- Once again, ensure the power is off.
- Carefully disconnect the electrical wiring from the cylinder's thermostat and heating element.
- Note the wire connections for reassembly. A photo can be helpful.
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Remove the Old Cylinder:
- Depending on the size and location of the cylinder, you may need assistance to carefully remove it.
- Be mindful of its weight.
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Prepare for New Cylinder Installation:
- Ensure the location is suitable for the new cylinder and that the base is level and stable.
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Install the New Cylinder:
- Carefully position the new cylinder in place.
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Reconnect Plumbing:
- Reconnect the hot and cold water pipes using the appropriate fittings. Use PTFE tape (plumber's tape) on threaded connections to ensure a good seal.
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Reconnect Electrical Connections:
- Reconnect the electrical wiring to the thermostat and heating element, ensuring the connections match the wiring diagram or your previous notes/photos.
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Fill the Cylinder:
- Close the drain valve.
- Slowly open the cold water inlet valve to allow the cylinder to fill.
- Leave the hot water taps open to vent air from the system.
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Check for Leaks:
- Carefully inspect all pipe connections for leaks. Tighten fittings as needed.
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Turn on the Power:
- Once the cylinder is full and you have checked for leaks, turn the power back on at the consumer unit.
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Test the System:
- Wait for the water to heat up and test the hot water taps to ensure hot water is flowing.
- Monitor the cylinder and pipework for any further leaks.
Important Considerations:
- Building Regulations: Check local building regulations regarding hot water cylinder installation, as permits may be required.
- Cylinder Size: Ensure the new cylinder is the correct size for your needs.
- Insulation: Ensure the cylinder is adequately insulated to conserve energy.
- Safety Valves: Ensure safety valves (pressure relief valve and temperature relief valve) are functioning correctly. These valves are designed to prevent dangerous pressure build-up.
Disclaimer: This is a simplified overview. Actual installation may vary depending on the specific cylinder and plumbing system. Always consult with a qualified plumber for professional installation and advice.
