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Centralised hot water systems • Indirect system with a primatic cylinder • Three air locks to prevent mixing of the primary and secondary waters • Save cost for expansion and feed tank, primary cold feed and primary vent pipe • Limited in use to small installations 56
1.1.00 The ‘HWA Design Guide for Stored Hot Water Solutions in Heat Networks 2018’ provides design guidance and advice for engineers who are looking to specify stored hot water solutions working within a heat network.
Learn how an indirect hot water heater works, with a helpful diagram explaining the process and components involved. Understand the benefits of using this type of water heater and why it is a popular choice for many homeowners.
The indirect system prevents furring of the boiler, primary flow and return pipes, and hot water storage cylinder. The system is also employed in soft water districts when heating is combined with hot water supply, to prevent rusting of the cast iron radiators, which causes discolouration of the water to be drawn off.
Pump system design. The systems must comply with Water Authority (WSD) requirements. General principles for installing plumbing works (from WSD Plumbing Installation Handbook) All water fittings and pipework shall comply with the relevant Waterworks Regulations.
Centralised hot water systems • Indirect system with a primatic cylinder • Three air locks to prevent mixing of the primary and secondary waters • Save cost for expansion and feed tank, primary cold feed and primary vent pipe • Limited in use to small installations
requirements, including hot water supply provision, system design, safety considerations, and installer accreditation. The page aims to guide readers through the essential information needed to ensure compliance and safe operation of unvented hot water storage systems.
