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Gravity hot water system

Gravity hot water system

This is a traditional open vented system with gravity fed domestic hot water heating (DHW) and central heating that is pumped around the system. In this traditional open-vented design, the system is fed with water and kept under pressure via gravity-fed water from the main header tank in the loft. The hot water cylinder is heated simply via a gravity hot water circuit from the boiler, and central heating is provided via a separate pumped circuit from the boiler.

A separate header/expansion tank is used to feed the DHW to prevent the risk of contamination with the primary circuit water.

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