![]() More efficient as there is less potential for heat loss, e.g.Debris can enter the system via F&E tanks It keeps the system cleaner at its sealed off.Options to change to a Combi or System boiler set up.Greater flexibility in siting the boiler and other system components.A pressure gauge guides users when refilling. It makes a temporary connection when turned on to fill the system with mains water. There is no float valve to automatically feed water back into the system, instead water must be manually replenished via a ‘filling loop’.Ī filling loop connects the system pipework to the mains water pipework. In place of the open vent pipe, a pressure relief valve (which remains closed under normal operating conditions) opens in the event of an over pressure fault to let surplus water out. As the system cools, this pressurised vessel pushes water back into the system. In place of an F&E tank, a sealed system comprises an expansion vessel into which system water can expand as the water heats. ![]()
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