Frequently asked questions

1. Why to choose a stainless steel dry water heater compared to a classic heater?

If the dry heater needs to be replaced at some point, there will be no need to drain the water from the boiler. It is enough to turn off the electricity, remove the heater from the pipe and insert a new one, then simply plug it. The pipe into which the dry pressed heater is inserted is straight made of stainless steel, so limestone deposits are less retained on its surface. The temperature reached by a dry heater is slightly higher than a standard heater at the same power, so the heating time of the same amount of water is shorter.

2. What is an Mg anode, what is its role and when should it be replaced?

During the water heater exploitation, certain places on the heater undergo thinning or damage of the protective enamel coating. Between these critical places and the anode there will appear a low voltage which causes “protective” flow of the electrons from the anode to the unprotected place on the water heater. By “sacrificing” the anode, the life span of the tank is prolonged. Higher water conductivity and higher water temperature have a negative effect on the lifespan of the anode. It is recommended that the period of the checkup of the anode does not extend 36 months.

3. How important is water heater insulation and what is Metalac water heater insulation like?

The water heater is one of the biggest energy consumers in a household. A larger part of the stored energy is lost through the usage of hot water, another part is lost through the walls of the tank and the coating of the water heater. Good-quality insulation is especially important when hot water is stored during night when electricity is cheaper and used later during the day. Minimum thickness of the insulation in our water heaters is 17mm; the insulation material used in our water heaters is good quality two-component polyurethane foam.

4. Is the assembling of the water heater by an authorized service only a condition for the warranty validity?

In order to realize their right to warranty, the customers need not have their water heaters installed by the authorized service, but it is recommended that they do it because they are best acquainted with the device they service. The list of the services is in the documentation enclosed with the purchased product. If the assembling is not carried out by the authorized service, it is recommended that the assembling be carried out by an experienced mechanic.

5. Can heat exchanger be built in subsequently if it was not originally built in?

No. It is not recommended to make any changes that can affect functioning of the product since the warranty does not cover such cases.

6. How to protect the water heater against low temperatures in the winter?

If the water-heater is not used in winter months and is placed in the rooms where temperatures below 0 degrees Celsius can be expected, it is recommended that the water heater should be emptied of all the remaining water. If not, the tank can burst.

7. What is non-pressure tap and how does it function?

Non-pressure tap, by its construction, enables constant connection between atmosphere and the tank in the water heater, that is, there is no obstacle to running water from the water heater to the tap. Apart from that, the non-pressure tap keeps the pressure inside the tank below 0.07 MPa. When the tap is off, the pressure in the tank is equal to the atmosphere pressure.

8. Are small-capacity water heaters the same as instantaneous water heaters?

No. Small-capacity water heaters by their construction belong to storage water heaters (they store hot water for later use), while instantaneous water heaters do not store water – they heat the water that runs through them directly. The heaters in instantaneous water heaters have greater strength, and that is why they need special electric installation in the house, or other objects.

10. What is the difference between enameled and inox tanks?

Enameled tanks are produced of black steel which is coated with a special protective layer – enamel, which is similar to glass by its characteristics. Inox tanks are produced of stainless steel, the same material that cookware is produced. Inox tanks do not need any additional corrosion protection.

11. When should the water heater be cleaned of scale?

It depends on the conditions of exploitation: water quality (hard or soft water), temperature in the water heater (the higher the temperature, the more scale there will be), as well as the frequency of the usage of the water heater. In certain cases, it is necessary to clean scales after six months.

12. What is a combined water heater (with heat exchanger)? What are its advantages over other models?

These combined water heaters have a built-in pipe heat exchanger, which enables the combination of electrical and other sources of energy (central heating, solar panels) for heating water. Water from the outer system runs through the exchanger in the shape of a spiral which heats the water in the water heater. There is an electric heater built in as well which functions when the heat exchanger is out of use.

13. Does it pay more to turn the water heater on only at night or should it be on all the time?

If hot water in the household is used all day long, then it pays more to have it on all night long. If hot water is used in certain periods of the day, water should be heated at night, when the electricity is cheaper.

The forming of scale is not directly connected with the way of heating water.

14. Should water heaters be turned off while you are taking a shower or should it be done only with out-of-date water heaters?

The control of functioning and safety of all our water heaters is carried out during the production process. We also implement ISO standards in our quality control system. It is the manufacturer`s obligation to warn their customers to turn off the water heaters just before hot water usage in spite of the fact that the products undergo 100% control in the manufacturing process.

15. Is there any difference between small-capacity water heaters for upper assembling and lower assembling and how can they be differentiated?

The name of the lower assembling water heaters has a letter P (e.g.EZV 10P); the upper assembling has a letter N (e.g.EZV5N). A sales person should be consulted when purchasing the product since there may arise a number of issues due to wrong installation. The water heater might not work properly and might break.

16. Why is water dripping after turning off of the kitchen tap?

When you run hot water through the tap, the water runs through the water heater. Due to that running there is a resistance to water flow in connectors and the tank, which leads to lesser pressures and pipe and tank deformation. When you turn off the tap, the pipes and the tank disencumber and they resume their former shape: the excess water is pressed through the decanting pipe of the water heater and through the tap. (Kitchen taps are, by construction, always open towards the atmosphere and enable the free flow of water through the tap. There is no valve which could prevent running of water out of the water heater through the tap). The quality of the kitchen tap can also be of crucial importance in this matter.

17. Why is water dripping when the small capacity water heater is on?

Small capacity water heaters are vessels open to the atmosphere all the time, that is, they are non-pressure water heaters. The taps that go with these water heaters must also be non-pressure. That means that air and water flow freely between the water heater and the tap pipe. When the water heater is on, all the water in the tank is heated and stretches. The excess water runs out of the water heater, first through the decanting pipe of the water heater and then through the tap.

18. How to install a non-pressure small capacity water heater correctly?

In order to assemble the small capacity water heater correctly, a corresponding tap should be used (the one that is meant to go with this type of water heaters). Water pipes or hose are installed between the water heater and the tap. Sealing of the joints between the water heater and pipes is solely carried out with the level sealant on the front part of the instilled and outflowing pipes of the water heater. There is no need to use any other devices. For tightening of the joints between the water heater pipes and the connection pipes it is enough to do it by hand. Use the spanner if necessary. After the connection process has been finished, turn on the hot water tap and wait for a few moments for the water to start running. It takes some time for the tank to be filled with water before it starts running. Only then is it allowed to plug the water heater in and turn on the heater. Otherwise the water-heaters` components can be hindered, especially the components of thermic protection.

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