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Level 3 Hot WaterIan Hall 2018
Introduction
An unvented hot water cylinder is a pressurised system which is fed directly from the cold mains water feed and therefore can deliver hot water at mains pressure, which is great for improving the performance of your shower and bath.
An unvented hot water system can be heated directly, indirectly or a combination of the two.
In this eBook you will find information regarding unvented systems, secondary return information and much more.
The usual quizzes and links to video content will also be available throughout this eBook, again please enjoy....
Ian
An unvented hot water system can be heated directly, indirectly or a combination of the two.
In this eBook you will find information regarding unvented systems, secondary return information and much more.
The usual quizzes and links to video content will also be available throughout this eBook, again please enjoy....
Ian
Centralised systems are those where the source of hot water supply is sited centrally in the property for distribution to all of the hot water outlets. They are usually installed in medium to large domestic dwellings such as a three-bedroom house. These can be further divided into:
centralised open-vented hot water systems
centralised unvented hot water systems
centralised instantaneous hot water systems.
centralised open-vented hot water systems
centralised unvented hot water systems
centralised instantaneous hot water systems.
Centralised open-vented hot water systems
They may be further sub-divided into:
the direct system
the indirect system
the double-feed indirect system
the single-feed, self-venting indirect system
The link below shows a video of a walk-through of hot water systems
https://photos.app.goo.gl/6QBfMqG9iuossPdr8
They may be further sub-divided into:
the direct system
the indirect system
the double-feed indirect system
the single-feed, self-venting indirect system
The link below shows a video of a walk-through of hot water systems
https://photos.app.goo.gl/6QBfMqG9iuossPdr8
With the water inside the unvented hot water storage vessel at a pressure above atmospheric pressure, the control of the water temperature becomes vitally important. This is because as the pressure of the water rises, so the boiling point of the water rises. If the temperature in the cylinder reaches 90–95°C this valve begins to discharge.
The Building Regulations Approved Document G3 states that unvented hot water storage systems must have a three-tier level of safety built into the system. This takes the form of three components that are fitted to the storage vessel:
Control stat 60–65°C
High-limit stat 80–85°C
Temperature-relief valve 90–95°C
Three-tier safety – Thermostat, high-limit and temperature-relief valve
Hot stored water – never to reach 100°C
The Building Regulations Approved Document G3 states that unvented hot water storage systems must have a three-tier level of safety built into the system. This takes the form of three components that are fitted to the storage vessel:
Control stat 60–65°C
High-limit stat 80–85°C
Temperature-relief valve 90–95°C
Three-tier safety – Thermostat, high-limit and temperature-relief valve
Hot stored water – never to reach 100°C