Paper shows the results of laboratory testing of heat exchanger and its application in real operation in household. Although the efficiency of shower heat exchanger reaches even above 40 %, achieved energy savings for hot water preparation range between 10 and 15 %.

The introduction of stricter Ecodesign requirements for products associated with the consumption and production of energy is related to a smooth transition to the use of gas condensing boilers. In practice, exchanges of old boilers meet incorrect interpretation and perceptions about the benefits of condensing boilers. The article therefore assesses the impact of condensation theory and measurement and answers some practical issues.

There are a number of hydrogeological sites unsuitable for construction - there is nowhere to drain and building in the inappropriate area creates barriers to drain rainwater from the site. Then, the only solution is to minimize runoff.

The introduction of stricter Ecodesign requirements for products associated with the consumption and production of energy is related to a smooth transition to the use of gas condensing boilers. In practice, exchanges of old boilers meet incorrect interpretation and perceptions about the benefits of condensing boilers. The article therefore assesses the impact of condensation theory and measurement and answers some practical issues.

The article deals with possibilities of using heat from waste water discharged by outlet pipes of house appliances. The first section describes the basic possibilities of the local heat recovery (recuperation), used mainly in showers and shower baths. Theoretical analysis of the efficiency and related achievable savings is supported by an experimental measurement of a selected type of recuperative heat exchanger. The results of the measurement are compared with the classification according to the Passive House Institute. In addition to the efficiency and energy savings achieved by deploying the recuperative heat exchanger, the economic return of the specific heat exchanger is also determined for different boundary conditions.

In practise we meet more and more places that are not connected to the utility network and must be dealt individually. At the same time number of technical solutions which can tackle this task as effectively as possible and take individual requirements into account is increasing. Solutions range reaches from small savings in water consumption to total replacement of drinking water, from the use of gray water for flushing to its full recyclation.

The article describes the requirements for domestic hot water in residential houses. It deals with determining the need for hot water depending on the type of house, hot water consumption profile in residential buildings and with three basic methods for designing storage hot water tank and heat output of hot water heaters.

The article compares legislative regulations in hot water preparing and their impact on the determination of hot water requirements. It is based on analysis of hot water consumption in hotels compared with hot and cold water requirements. The influence and aplication of the legislative regulation are described in relation to reducing warm water energy consumption.

The question is: is gas condensing boiler with a hot water flow requiring power of 24 kW suitable for the apartment with little heat loss? Because under these conditions for the entire heating time, or a large part, boiler will cycle. Will this cycling be negatively reflected on the natural gas bill?

The question is: is gas condensing boiler with a hot water flow requiring power of 24 kW suitable for the apartment with little heat loss? Because under these conditions for the entire heating time, or a large part, boiler will cycle. Will this cycling be negatively reflected on the natural gas bill?

Water prices drop in most of the Pilsen region. Minister of environment Richard Brabec asks: Where goes the rest of the water charges if the state has 2 CZK/m³ of water. Who earns on the water? Minister calls for a national debate about water prices.

2000 respondents were asked about their water usage for personal hygiene and other common purposes. Respondets were also asked about their water-saving knowledge, using that knowledge and about reasons why to save water.

In order to prepare for the period of water shortage, and be able to predict these periodst, we should have all data about water wells and a man who cares about the data and interprets it.

1200 municipalities in the Czech Republic has no public water and residents are dependent on individual sources or municipal wells. According to the Law on Water Supply and Sewerage 2130 there waterworks operators to keep emergency supplies. More than 95 % of them relate to small communities.

Gray water recycling requirement for construction of new buildings of a certain size becomes mandatory in some areas. It can be expected that over time this trend will spread into areas that are prone to lack of drinking water, or the lack of treatment capacity impedes economic growth.

The article describes the sources, forms and health risks of lead in water and mainly removal of lead from water using sorption materials CFH 0818, Bayoxide E33 and GEH. The results of laboratory measurement show that all three materials were able to reduce lead concentrations well below the limit of decree no. 252/2004 Sb. Overall, the best results in the removal of lead from the water reaches the sorption material Bayoxide E33. Furthermore, it was shown that the used sorption materials have an effect on the removal of iron and manganese from water.

Paper analyses the dependance of heat savings by heat exchanger for waste water heat recovery on its efficiency, including the realistic conditions for heat exchanger operation.

Automatic sprinkler systems are used for fighting usually water. Firefighting foam is possible. Accordingly, sprinkler systems water or foam-water. Sprinklers are triggered automatically.