Hot Water Cylinders
Hot water cylinders are essential components of heating systems, providing a reliable supply of hot water. There are two main types, vented and unvented hot water cylinders.
Here’s a breakdown of the differences between them.
Vented Hot Water Cylinders
- Gravity-Fed: Vented cylinders rely on a gravity-fed system, where a cold water storage tank (usually located in the loft) supplies water to the cylinder.
- Venting: These cylinders are open to the atmosphere and have a vent pipe that allows air to escape, preventing pressure build-up.
- Simplicity: Installation is relatively straightforward and less expensive compared to unvented systems.
- Maintenance: Typically easier and cheaper to maintain. However, the presence of a cold water tank means more potential points for issues like leaks or contamination.
Performance
- Water Pressure: The water pressure is dependent on the height of the cold water tank. As a result, the pressure can be relatively low if the tank is not elevated sufficiently.
- Suitability: Ideal for homes with low water pressure and where space for a loft tank is available.
Unvented Hot Water Cylinders
- Mains-Fed: Unvented cylinders are directly connected to the mains water supply, eliminating the need for a cold water storage tank.
- Sealed System: These cylinders are sealed and can handle higher pressures because they do not have a vent pipe.
- Complexity: Installation is more complex and usually more expensive due to the need for safety components like pressure release valves and expansion vessels.
- Maintenance: Requires regular maintenance to ensure safety components are functioning properly.
Performance
- Water Pressure: Provides higher water pressure as it uses mains pressure, resulting in a more powerful flow.
- Suitability: Ideal for homes where space is limited or where higher water pressure is desired. Suitable for delivering strong flow to multiple outlets simultaneously.
Pros and Cons Summary
| Feature | Vented Hot Water Cylinders | Unvented Hot Water Cylinders |
|---|---|---|
| Water Supply | Cold water storage tank (gravity-fed) | Mains water supply (sealed system) |
| Water Pressure | Dependent on tank height (usually lower pressure) | Higher pressure (mains pressure) |
| Installation Cost | Generally lower | Higher due to additional safety components |
| Maintenance | Easier and cheaper | Requires regular checks on safety components |
| Space Requirement | Requires space for a cold water storage tank | No need for a cold water tank, saving space |
| Suitability | Homes with low pressure and sufficient space for a tank | Homes needing high pressure and with limited space |
Unvented Cylinder Diagram
Vented Cylinder Diagram
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