OKHE SMARTSmart water heater with electronic thermostat and the option of connection to HDO. It includes autodidactic algorithm and heats water if required. It is possible to switch to several modes (MANUAL, MANUAL HDO, OPTIMUM, PROG, SMART, ANTI FREEZE). The heater is controlled by means of the operating system Android/iOS.


Economically use of water

Warm water and generally water savings

A Czech household consumes about 25 % of its total energy demand for making the hot utility water. This is why the sensitive approaches to the warm water and its handling can result in substantial energy and the water savings.

To achieve some of them it is sometimes enough only to set correctly the water heater temperature. The 60 °C setting is deemed optimal.

The distance from the tapping point to the water heater is also important, as the thermal losses are growing substantially at 2 m or more. If there is no other choice, make sure that the pipes have a good insulation („the more the better“ – it applies twice here).

As cutting the water temperature setting times, the economy of the lever-operated mixer taps is 40 % better that that of the normal types (given the water heating power consumption), regardless of the saving on water itself.

These savings can reach even higher with the thermostatic sets used. Here, you will merely set the required water temperature, and the device will do the work automatically, mixing the hot water with the cold. In comparison with the lever-operated sets, these will save up to 50 % of water.

The so-called „fizzers“ will also help us save water as you will not need so much of it when it is mixed with air.


When showering, you will consume about 3-times less water than upon having a bath in a tub.

A tub is certainly more economical for those who prefer the relaxing candlelight baths as the water consumption is less than upon showering over the prolong periods of time.

You can further save additional 30 % of warm water with an economical shower head and its stop valve.


To have an effective schedule making sure that the washing machine is ever full is the right-hand rule for the laundry washing savings. To turn on a half-full washing machine, it would be an evidence of your competitive nature as you probably want to the higher expenses than your neighbor.

In general, the units with the front door will consume 3-times less water and power than those with the top door, but otherwise similar performances. But they buy-in costs, of course, tend to be higher.

The washing water temperature is critical in respect of the power consumption. By reducing the washing temperature from 90 °C to 60 °C, you will save 25 % of power. And there is moreover much laundry that can be washed in cold water.


Concerning the toilets, the substantial water savings can be achieved with combi-bowl using the 6/3 dual flushing system. Unlike the old simple one, with this system you can save up to 8 liters per a flush. Given a four-member family, the water savings represent up to 24,000 liters a year.

When throwing napkins, cigarette buts, and other refuse into the toilet bowl and flushing them, you will hardly win any of the ecological conduct prizes. Next to the future problems with your waste water system, it is useless water wastage. It is much better to buy a small litter basket.

Any untight flush cistern, passing the water down, is very uneconomical as it can waste up to 16,000 liters of water per year. And, in fact, you need not be aware of it at all. If you want to check it, you have merely to put a few drops of the food coloring into the cistern and wait if the tint appears at the bowl bottom.


It is very important to see to it that the taps are tight. 160 liters of water will escape in a month through a single tap, which is just “a little” leaky (10 drops per minute). Should the warm water be the case, the escape also represents a power loss equal to 11 kWh.

The above-mentioned fizzers can also help reduce the water consumption, provided a correct type is selected. In a bathroom the fizzer with the flow rate of 2–3 liter per minute can be enough. But in the kitchen, you will need the flow rate from 6 to 12 liter a minute, of you are filling the dishpan on a regular basis. If, on the other hand, you are used to do the dishwashing under the running water, it is better to use the fizzer with the flow rate of 2–3 liter per minute.

If possible, do not let the warm water on permanently, when washing your hands, brushing your teeth, or while shaving.

Needless to say that the food de-freezing under the running water will certainly increase you final sum for the power and water; it is surely better to use a fridge to meet the purpose.


When washing your dishes under running water, you will consume thrice as much of it than in a closed dishpan.

In comparison with dishwashing under the running water, an economical dishwasher will save some 60 % water and about the same amount of power. Here, the economical conduct secret is the same as with the washing machines – never turn on your dishwasher when it is not full.

In general, the dishwashers able to take multiple sets of dishes are more effective.