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BWT Rondomat DUO S1-S3

Product information

  • For softening/partial softening of potable and non-potable water in residential and commercial properties
  • Low consumption of salt and rinsing water
  • DVGW-certified
more product details

BWT Rondomat Duo S – Drinking water softener with a process that can be adjusted to consumption rates

Depending on the actual consumption of the operator, water softening systems often have to be shut down for too long, which should be avoided for reasons of hygiene. The problem: excessive volumes of resin must be maintained in the system (capacity) to manage short-term peak flows that can lead to sanitation problems during consumption times with low water extraction (weekends, holiday periods, etc.) The time priority switch triggers regeneration, which increases the salt and rinsing water consumption while having to satisfy all the demands of a duplex softening system.

The new Rondomat Duo S uses its adaptable process (that can adjust to consumption rates) to satisfy these demands using different-sized softener columns − a base load and peak load column. The core of this technology is the ‘smart meter’ (intelligent water meter) and the new Soft Control T (touch panel controls). They enable automated flow-rate controlled switching to the differential pressure-optimised softener columns and ‘intelligent’ precision salination for consumption-based salt and rinsing water (operational efficiency). The operator can also activate the ‘Hyg Function’ to minimise stagnation periods. The flushing process is triggered after an adjustable, maximum permissible stagnation time.

An Aqua Watch function can also be activated, which triggers an alarm when the water flow rate falls below 60 l/h within a 10-minute period. BWT dosing pumps for flow-proportional additional dosing (e.g. protection against corrosion) and a hygiene set (a dosing pump to top up the chlorine dioxide during brine intake) can be connected directly to the electronic control system.

The feature here is the simple electrical connection using colour-coded connectors instead of a complicated array of screw terminals. The Rondomat Duo S is of course equipped with automatic blending, an energy-efficient electronic transformer and it can be connected to any building control system.

All the operating data is displayed on a clear graphic touch panel and can be read via a USB interface. The flow rate data for the previous 24 hours can also be displayed as a graph.

Benefits at a glance

  • Operational efficiency The regeneration process is controlled using inlet pressure, which reduces process time and water consumption by up to 30%. Precision salination and intelligent operation significantly reduces the consumption of salt and rinsing water.
  • Optimum capacity adjustment The control system monitors the regeneration intervals and increases capacity until optimum regeneration levels or the threshold of 150% nominal capacity, are reached. The optimum interval is determined by the demand profile set by the efficiency and hygiene standards.
  • Adaptive switching Controlled flow in the differential pressure-optimised columns.
  • Smart metering Intelligent measuring device linked to communication network.
  • Hygienic flushing Adjustable consumption-based flushing to avoid stagnation.

The system is available as a BWT Rondomat Duo S-i, and industrial versions are also available.

Main features:

  • Compact, flow-proportional duplex water softening system for softening/partial softening of potable and non-potable water
  • Quick installation and easy to commission
  • Microprocessor controls with graphic touch panel
  • Operational efficiency using an adapted process
  • Includes integrated pathogen protection device in accordance with DIN EN14743 and DIN 19636-100
  • Smart metering and soft control touch controls
  • The resin columns and brine tank are kept separate to ensure optimum system hygiene
  • Includes electrolytic cell

The DVGW-certified Rondomat Duo S systems are optimised for fluctuating flow rates, making them ideal for use in drinking water in residential and commercial properties. The different resin quantities/bottle sizes ensure minimal loss of pressure. The automatic blending valve can be adjusted separately for the required hardness level.

The Rondomat Duo S system is available in 3 sizes:

  • S1: Nominal flow with <0.1° dH: 1.5 m³/h
  • S2: Nominal flow with <0.1° dH: 2 m³/h
  • S3: Nominal flow with <0.1° dH: 3 m³/h
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