About Vented and unvented hot water cylinders
Vented hot water cylinders rely on gravity and have a separate cold water storage tank. Unvented hot water cylinders work directly from the mains water supply, providing pressurized hot water without the need for a storage tank. Unvented systems offer better performance and eliminate the need for a tank, but require professional installation and maintenance.
What is included?
The components included in vented and unvented hot water cylinders can vary slightly, each system typically consists of:
Vented Hot Water Cylinders:
- Hot Water Cylinder: This is a large, insulated tank that stores and heats the water.
- Cold Water Storage Tank: Also known as a header tank, it is usually located in the loft or an elevated position. It supplies cold water to the hot water cylinder.
- Vented Pipe: Connected to the hot water cylinder, it allows excess pressure and steam to escape safely.
- Immersion Heater: An electric heating element inside the cylinder that can be used as a backup heating source if the primary heating system fails.
- Expansion Pipe: It provides an outlet for expanding water due to thermal expansion.
Unvented Hot Water Cylinders:
- Hot Water Cylinder: Similar to the vented system, it is a well-insulated tank that stores and heats the water.
- Inlet Control Valve: Connects the cylinder to the mains water supply, allowing cold water to enter the cylinder.
- Pressure Relief Valve: Ensures the pressure within the cylinder remains at a safe level by releasing excess pressure.
- Expansion Vessel: Absorbs the expanded water volume as the water heats up, preventing pressure buildup.
- Temperature and Pressure Relief Valve (TPR Valve): Safely releases hot water if the temperature or pressure exceeds safe limits.
- Immersion Heater: Like in vented systems, an electric heating element provides a backup heating source if needed.
It's important to note that the specific components and their arrangement may vary depending on the manufacturer and system specifications. When considering a hot water cylinder, it is recommended to consult with a professional to ensure compliance with regulations and the specific needs of your property.
