--- title: Puff - Water Plant description: "The appliance’s water system is divided into two parts: the softened water circuit and cold water circuit The softened water circuit is used to produce the steam The cold, untreated water circuit is u" --- [Skip to content](https://support.lainox.com/en/knowledge/p#main-content) - [English](https://support.lainox.com/en/knowledge/p) - [Deutsch](https://support.lainox.com/de/knowledge/puff-) - [Español](https://support.lainox.com/es/knowledge/puff-4) - [Français](https://support.lainox.com/fr/knowledge/puff-1) - [Italiano](https://support.lainox.com/knowledge/puff-4) English Show submenu for translations ![LAINOX bianco 500.png\]](https://support.lainox.com/hs-fs/hubfs/LAINOX%20bianco%20500.png?height=40&name=LAINOX%20bianco%20500.png) Open main navigation Close main navigation - - [English](https://support.lainox.com/en/knowledge/p) - [Deutsch](https://support.lainox.com/de/knowledge/puff-) - [Español](https://support.lainox.com/es/knowledge/puff-4) - [Français](https://support.lainox.com/fr/knowledge/puff-1) - [Italiano](https://support.lainox.com/knowledge/puff-4) English Show submenu for translations - [Go to Lainox.com](https://www.lainox.com/) [Go to Lainox.com](https://www.lainox.com/) Lainox Support - There are no suggestions because the search field is empty. 1. 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[How it works](https://support.lainox.com/en/knowledge/puff#how-it-works) # Puff - Water Plant #### Water plant ![](https://support.lainox.com/hs-fs/hubfs/image-png-Sep-19-2024-03-04-14-3741-PM.png?width=597&height=350&name=image-png-Sep-19-2024-03-04-14-3741-PM.png) The appliance’s water system is divided into two parts: the softened water circuit and cold water circuit The softened water circuit is used to produce the steam The cold, untreated water circuit is used for the washing system   #### Solenoid valves The solenoid valves are essentially all the same and are identified by the number of outlets and the possibility that one of the outlets may have no electrical coil installed Possible to identify each solenoid by the name printed on the wire that connect it **Humidification valve S1** This solenoid valve is connected to the soft water inlet and has always applied a flow regulator; flow depends on the model and power supply. This solenoid valve is driven by SD if unit is settled as direct injection O35 **Washing valve S7** This solenoid, part of the washing system, is connected to the cold-water inlet and has no flow regulator it is connected to the washing system O41   #### Flow regulators ![](https://support.lainox.com/hs-fs/hubfs/image-png-Sep-19-2024-02-56-45-8882-PM.png?width=688&height=321&name=image-png-Sep-19-2024-02-56-45-8882-PM.png) Solenoid valves used for steam production are always equipped with a flow regulator to supply the predetermined amount of water, regardless of the supply pressure. 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