Heat exchanger

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Prevalle, Italy
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Heat exchanger

SAP is a station for the instantaneous heating of domestic water matching high performances and comfort. SAP is designed to produce domestic hot water using a storage tank full of heating water, that can be heated by any generation system consisting of thermal solar plant, heat pump, pellet stove, heating fireplace, gas boiler, electric resistance or a combination of different systems.This choice allows to use a single tank to cover both heating and domestic hot water production service; besides, it also allows not to store tap water, a practice that may be subject to restrictive regulations in terms of water temperature, health measures and maintenance operations.
SAP’s core is a high efficiency plate heat exchanger: hot heating water pumped from the storage tank flows through its primary side and transfers heat to cold tap water supplied by the mains flowing through its secondary side. Outlet temperature control is electronic and setpoint value can be set through a controller: a flow-and-temperature sensor installed at DHW outlet transmits the measured temperature to the controller, which adjusts primary pump velocity so to quickly respond to any system variation (for example, the closure of a tap) and to maintain the supply temperature steady.

Further info from manufacturer on SAP
Further details
In case water can reach high temperatures (> 70 °C) within the storage tank, “M” versions of SAP can be chosen: these models feature a thermostatic 3-way mixing valve installed upstream the exchanger primary inlet, in order to limit the inlet temperature and to reduce the risk of limescale formation on the secondary side.

Available in several sizes (30 to 100 l/min) and variants (with or without recirculation circuit, which can be managed by the onboard controller, too), SAP is equipped with integral expandedpolypropylene insulation shell and with all the accessories premounted: just plug SAP in, and it is ready to work!
Cascade SAPs
For extremely high or extremely variable demands, more identical SAP units can be connected in parallel and operated in cascade.
The master management system (controller, VFS sensor and motorized tap water valves) leaves each SAP the task of regulating its own working parameters, and manages the turnover of startings, in order not to stress the first element of the cascade too much.

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