C&G 6189 L3 Practice Questions - City & Guilds 6189 Level 3 NVQ Diploma In Domestic Plumbing & Heating Exam

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Which body of water expansion must the expansion vessel or expansion volume accommodate on a sealed unvented hot water cylinder?

The expansion of the central heating water only Approximately 4% of the stored hot water volume as it is heated The full cylinder volume in case of total drain-down The cold mains supply pressure surge only

Correct Answer:

Approximately 4% of the stored hot water volume as it is heated

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