Heat storage system for central heating system has advance and return connections to heater, upper advance connection being used for temperatures above threshold value while lower is used for temperatures below it

摘要

Heat storage system for a central heating system has advance connections (12, 14) and a return connection (20) to a heater and an advance (16) and a return (18) connection to a boiler. The upper advance connection (12) to the heater is used for temperatures above a threshold value while the lower (14) is used for temperatures below it.