The WHP 6-connection series includes hanging tanks for "HEAT-COLED" systems suitable for use with heat pumps, they perform the functions of a hydraulic circuit breaker (making the flow rates of the two circuits independent), and that of a thermal flywheel (aimed at minimising heat pump start-ups). WHPs, in the 45/85 L versions, have two additional connections dedicated to a possible supplementary source. it is possible to order the product in batches with multiple packaging, receiving the tanks on a pallet. The 18 L version can be installed horizontally.