It is currently being prepared standard CSN 75 6780 dealing with this issue comprehensively. This standard describes the requirements for pre-treatment, storage and handling of rainwater and gray water. The standard is based on the English Standard BS 8525-1 [1] and is supplemented, in the spirit of the modern approach to the water as well as part of energy use of gray water.

The article describes the sources and forms of nickel in water and mainly experimental removal of nickel from water using sorption materials CFH 0818, CFH 12, GEH and Bayoxide E33. Overall, the best results in removing nickel from water reached Bayoxide E33.

Centralized provision of hot water in the apartment building is associated with the specifics of four (commercial space, unmetered amount of heat for the preparation and distribution of hot water, the limits of specific consumption of heat, heat supply technology for domestic hot water through residential transfer stations).

In relation with the implementation of the revised EU Directive 2010/31/EU on the energy performance of buildings are currently changing some of Czech legal regulations and new methodology for energy performance assessment is introduced . This article focuses on an example rating the standard family house with conventional solution of building envelope and technical systems, using the new evaluation method. For this object will be also an obligation to issue an energy performance certificate as required by the Consolidated Act No. 406/2000 Coll., as amended.

Article discusses the possibility of using gray water in buildings and as the example cites the hotel Mosaic House in Prague. This hotel is the first building in the Czech Republic, where they were used gray water for flushing toilets and for cleaning. The article also described the gray water treatment technology.

The paper is a practical example of the implementation of risk analysis of municipal-type water distribution system, which is meant system operated by municipalities. The implementation of the risk analysis was used WateRisk methodology, as well as the same name software.

The European Union is committed to reducing energy consumption in the built environment. Since the heating, ventilation and air conditioning (HVAC) represents approximately 11% of the total electricity consumption in Europe, these systems are an important part of the commitment of the EU. In this article, we discuss two specific aspects of HVAC energy efficiency, both are based on that understanding how the commercial buildings work in real life is the first step towards reducing energy consumption.

The article deals with unconventional methods of drinking water disinfection, as mainly membrane processes and technology of mixed oxidants (MIOX), as well as the use of ionizing radiation and the use of metals with oligodynamic effects.

The new standard CSN 75 5409 is valid from March 1^st 2013. Technical Report on protection against Legionella will apply from May 1^st 2013. In case of conflict of energy saving and hygiene prevails hygiene. Size of the hot water tank is chosen according to the requirement of heat pump. Volume of accumulation of solar systems is about 50 l / m ² of collector area.

The author draws near possibilities of “economical” disinfection of not only drinkable water itself, but thoroughly informs of disinfection possibilities through UV radiation, specifies the advantages and potential risks limiting situations for its use as well as legislative requirements including data concerning the matter of foreign information in his article. Designers, which shall consider the application of this disinfection technology, should, according to the author’s recommendation, apply also the other requirements of factual service condition, i.e. the bio-indication effect of the UV equipment concerning the drinkable water disinfection. Possibilities of this technology application for the water disinfection are illustrated in detail in the contribution.

How indeed effectively save water? What is the experience with galvanized pipe? How long can water stagnate in the pipes and how to ensure its quality and safety? The decline in the technical level of projects is related to low-priced project work, and with the decline of practical knowledge of young designers.

Infiltration of rainwater runoff as a disposal method of rainwater runoff, become an integral part of rainwater management. The article discusses about quality of rainwater runoff with regard of protection of soil and surface water. Under the project “Increasing of the rain water management efficiency for the purpose of energy demand minimization” we have started our own measurements of rainwater quality parameters at the campus of Technical University of Košice. The aim of this article is to provide overview of our measured data of rainwater quality.

Innovative approach evaluates the extent of the energy used quite effectively (in hot water) for the various types of storage heaters - that are based on uniform assessment base. This approach is very different compared to today introduced inland evaluation of energy performance heaters, according to which they are monitored and evaluated only heat loss at a standstill.

Infiltration system is technical equipment absorbing the excess of rainwater that flows from rooftops, roads, car parks and other buildings. Rainwater management and infiltration systems are very important for rainwater drainage and they offer us many ecological and economical benefits and last but not least they represent widening of technical solution scale for rainwater efficient use.

Sewage water contains organic compounds, thermal and kinetic energy, the amount is about 9 times higher than is needed for cleaning. The biggest source of heat energy are beyond the wastewater treatment plants, hotels, schools, restaurants, hostels, administrative buildings and other public facilities. Also, a wellness center, swimming pools, spas, and hospitals.

The author assesses individual methods of the calculation and compares the suitability of their use for four different types of facilities (a single family house, multiple dwelling house with 23 apartments, block of flats with 105 apartments, and a sport centre).

At present harmonization CSN 73 6660 Water supply in buildings [7] with the European standard [1] is being in process. After its completion it will finally be available a comprehensive normative means for the proper design and operation of water supply system. The revised standard [7] will be based on the entire European standard [1] and will be complemented by the Czech conditions. In particular it will deal in detail putting into operation of water supply system including its disinfection.

The article describes the sources and forms of iron and manganese in water, their health limits and possibilities removal of iron and manganese from the water. The most widely used method of removing these elements from water is oxidation, but are described also other options.

The article deals with the current practical problems associated with the swiming pool hall design issues and implementation of air conditioning systems. Describes the key causes of adverse conditions of internal microclimate. Points to the irreplaceable cooperation mutually cooperating professions, especially with regard to measurement and control of HVAC systems. Here, the article points out the lack of monitoring during the real operation of equipment, including quantification of actual operating costs. These are closely associated with a primary HVAC equipment design itself - pool unit. Its amenities, structure, designed air treatment and subsequent control with regard to the real operating conditions are a determining factor in the effective design and operation. Case studies are compared to alternative solutions and that "as we used to" and "with the active measurement and control system combined with advanced design methods."

Disturbances in the water network can be determined by operator on the basis of monitoring of unevenness curves of daily drinking water consumption. In the case of smaller municipalities, water consumption in the night is almost zero. If it’s not zero for long term monitoring, it is necessary to determine the cause of increased consumption and to find the fault.