Water heater - setting and energy saving
The installation of a water heater saves a lot of energy when properly adjusted and used
Advantages and disadvantages of a water heater compared to other systems
Hot water in the kitchen, at the sink, in the bathtub or in the shower can be produced in three ways: in houses with central heating usually near the heating an insulated tank, in which the water is, which was heated by the burner of the heater. If a resident turns on the hot water tap at a tap, the water from the tank flows through the pipes of the house to this faucet.
Although heating the water is cost-effective via the heater or a solar system, the system has one major drawback: The installation is expensive, because an additional power system is required for the house.
In everyday life, another disadvantage shows up: with each withdrawal, two to five liters of cold water flow out of the line at first uselessly. This amount cools again after closing the tap in the pipe. This waste is particularly important when only a little hot water is needed, for example, to tap a cup of water for brushing your teeth. When filling a tub, the wasted amount is less dramatic.
A decentralized hot water supply can be installed with less effort, a second line is superfluous. You can either choose a boiler, a storage heater or a water heater. Boilers are devices that heat up the required water only shortly before removal. They have the disadvantage that there is a wait until the warm water is available.
By contrast, hot water storage tanks are insulated and always contain a supply of warm water. These devices can therefore supply warm water immediately. When the hot water supply cools down, the appliances heat up, which adds further costs. In general, all systems that store warm water run the risk of Legionella proliferating. These germs can cause pneumonia.
Instantaneous water heaters contain a powerful heating unit that heats the water as it passes. They only consume energy when warm water is needed. The energy consumption during operation is very high. Usually a power connection is required. These devices are clearly useful when it comes to a frequent removal of small amounts of water. In most households, this is the case in the kitchen or when washing hands and taking a shower in the bathroom. However, if a bath is required several times a day, a boiler or a central hot water supply is more useful for the residents, to save unnecessary costs.
Short ways are important for the instant water heater
The main advantage of a water heater is that he immediately warm water supplies. The devices can only exploit this advantage if they are mounted close to the tapping point of the water. It makes little sense to install a heater of this type far from the extraction points. The water senselessly chills on the way to the faucet.
A good place for the unit is near the sink in the bathroom to provide this and the shower with hot water. If the kitchen is directly adjacent to this wall and the sink is on that wall, it makes sense to connect this tap as well.
If the various outlets are far apart, homeowners should install multiple appliances to save unnecessary heating costs. As there is no hot water in the pipes or in the appliances for a long time, there are basically no hygienic concerns.
Choose the Right Size
The unit must match the flow rate and heat output to the needs. A maximum temperature of 60 degrees makes sense. To produce enough warm water for showering, devices with more than 18 kilowatts are needed. These require a high-voltage connection.
If you only need a little warm water at a sink, you will need a water heater that can be operated from a standard power outlet. The water is only about 40 degrees warm. These temperatures are enough for washing hands. In kitchens, on the other hand, a power connection is important again. A water heater that draws only 220 volts can never generate enough hot water to rinse.
Setting the water heater and other energy-saving tips
The faster the unit delivers hot water, the less energy it wastes. So-called bare wire devices are therefore better than those that have a pipe spiral. Furthermore, electronic devices are cheaper because they can more accurately maintain the set temperature. The following rules for adjustment and handling are particularly important to save energy:
- Set the desired temperature on the water heater.
- Turn on the hot water tap and check that the water is at the correct temperature.
- Is the water for If the shower is too hot, lower the set temperature.
- Never mix cold water to cool the water that has just warmed up.
- Always set the mixer on showers and bathtubs to maximum so that no cold water flows in.
- Mixer on sink and sink set to "cold", so that the water heater does not always start when a little water is needed.
- If hot water is required on these basins, set the mixer lever to maximum.
In terms of initial cost (from 200 euros) and the simple installation, it is worthwhile to produce warm water via a water heater. But beware: The consumption increases strongly, if the device starts unnecessarily or cold water is mixed, because the attitude is not correct.
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