A fluctuating water temperature at a draw-off point can be extremely annoying. This means that domestic water distribution networks must be designed properly to ensure that, through correct regulation of the pressure inside domestic water systems, a stable response to hot and cold water requests is provided, while water and energy waste is reduced.


Caring for water and people’s health
Elements for safe water, with no waste
Water is a vital element and an asset that should be protected.
In times like these, marked by rapidly evolving climate and social changes, ensuring everyone has access to drinking water has become an increasingly challenging and urgent mission. It is therefore of paramount importance that safe drinking water is guaranteed, always checked and protected from potential contamination, utilising all the instruments and devices that modern system solutions place at our disposal.
Encompassing perfect temperature management, circuit balancing and water sanitisation, our comprehensive range designed to care for water and people alike protects human health and reduces waste of this most precious resource.
Solutions for controlling domestic water temperature and pressure

Compact, flexible and easy to install, the combined unit for pressure control in domestic water systems is the ideal solution for all applications requiring precise temperature and pressure control.
The unit combines three different devices in a single component:
- a ball shut-off valve
- a pressure reducing valve with strainer
- an anti-pollution check valve, EA type
Installed on the pipe supplying hot or cold water to the users, the combined unit for pressure control reduces the pressure of the water coming from the network, prevents the backflow of water into the water mains and allows branch isolation during testing and maintenance procedures.
Solutions for sanitising and disinfecting water

Legionella bacteria is a silent threat to health which hides not only in domestic plumbing systems, but also in natural environments.
The key elements in preventing Legionella within a domestic water system are:
- Careful domestic water network design with proper insulation/positioning of pipes and the selection of suitable materials
- Targeted thermal disinfection with devices that guarantee temperatures high enough to prevent proliferation of the bacteria
- Constant movement of the water through the recirculation network to prevent stagnation
- Correct balancing of the recirculation system to reduce water wastage and guarantee the correct temperatures at every point of the circuit
- Constant monitoring and recording of the hot water and return water temperature values, ensuring that the parameters remain within safety limits
Legionella bacteria proliferates and becomes dangerous in the temperature interval between 25 °C and 45 °C, while it is effectively neutralised at temperatures above 50 °C.
The electronic mixing valve with thermal disinfection protects domestic hot water distribution systems from Legionella through a special regulator which manages specific programs for thermal disinfection of the DHW circuit. Plus, it keeps track of the actual temperatures reached and thermal disinfection times, making it possible to carry out targeted corrective procedures whenever necessary. All the parameters can be tracked as they are updated every day and logged, with temperatures recorded every hour.
Solutions for protecting the water mains

Domestic water distribution networks should maintain the potability throughout the entire system.
In fact, users must be guaranteed safe water which is always checked and protected from all types of contamination, utilising all the instruments and devices that modern system solutions place at our disposal. Backflow prevention devices, developed in the 1960s are still the most effective devices used to achieve this goal today.
The backflow preventer is an essential solution in the protection of water mains. Each device is designed to prevent potentially contaminated water from returning to the mains network, a phenomenon which may occur due to pressure variations in the distribution system causing a reversal in flow direction.
Installed between the public main water system and the private network in water distribution systems, the backflow preventer creates a separation zone which prevents the water contained in the two systems from coming into contact.
Solutions for protecting the domestic water systems from limescale

Limescale is one of the main causes of inefficiency and deterioration in domestic water systems, especially in areas with hard water containing high levels of calcium and magnesium salts.
Without suitable protection, its formation can cause:
- malfunctioning of the system and limited performance
- pipe blockages
- build-up on electric resistors and heat exchangers
- higher energy usage and maintenance costs
To prevent these problems and ensure long-term system efficiency, it is essential to install anti-scale devices capable of offering protection while also preserving connected equipment.
The CALEFFI eCAL® anti-scale device efficiently and sustainably protects systems, generators, home appliances and taps. Installed directly on the domestic cold water pipe, it utilises electrolytic action to change the structure of the calcium crystals that cause limescale, reducing its formation and doing so without altering the hardness and chemical composition of the water.
Thanks to the built-in filter and magnet, it offers dual protection, capturing particles down to 50 μm, impurities and ferromagnetic particles. The dezincification resistant brass body with an extremely low lead content ensures the utmost safety, as it does not release toxic substances into the water.
CALEFFI eCAL® benefits:
- Continuous protection against limescale
- Does not alter water hardness
- Does not require electricity
- Does not use chemical substances
- Fully inspectable