What size of boiler do we need?

The required amount of hot water per person ranges from 30 to 40 liters per shower on average.

When choosing a boiler, the size of the apartment and the hot water pipes that are installed in the house and/or from the roof must be taken into account.

• A family of 2 needs a water tank with a volume of 80 liters.
• A family of 3–4 needs a water tank with a volume of 120 liters.
• A family of 4–5 needs a water tank with a volume of 150 liters.
• For a family of more than 5 it is recommended to install a 200 liters water tank.

How much does it cost to heat the water in the boiler by electricity?

The boiler usually consists of a 2.5 kilowatt electric heating element. Assuming that one kilowatt hour costs 55 ag (including VAT)

The cost per operating hour of the boiler will be NIS 1.375 

 

 

Please note that electricity rates change from time to time.

What is the temperature of the hot water with which we shower?

The temperature of use varies between the seasons and from person to person.

For example in winter we need a higher temperature of hot water than in the summer.

Therefore, the average is between 37° and 40°C.

When should you turn on the electricity in the boiler?

As a general rule, the power of the boiler should be turned on as close as possible to the time the water is used, in order to reduce heat loss in the boiler.

In Nimrod boilers the thermal loss is low and the hot water will be kept in it for a relatively long time.

How much hot water do we need to shower?

The temperature of use varies between the seasons and from person to person.

For example in winter we need a higher temperature of hot water than in the summer.

The required amount of hot water per person ranges from 30 to 40 liters per shower on average.

How long will it take me to heat the water in the boiler by electricity?

Assuming that the water temperature at the entrance to the boiler is 15–17 degrees,

the required heating time is about 1.5 minutes per liter of water.

If the water temperature is lower, the heating time will be longer.

How much hot water is used during the day?

Each user should learn his usage needs and use the hot water wisely to save electricity and money. Using hot water in the shower, bath, and while washing dishes or washing hands affects the amount of energy needed to heat the water in the boiler. Although these uses are essential, steps can be taken to reduce consumption.

For example:

• Use shower heads and faucet heads that allow increased water pressure, while reducing the amount of water flowing through them. This way you can save both water and electricity.
• In winter, close the doors and windows in the bathroom when bathing, so that it does not get cold and you can make do with less hot water.
• Turn off the tap while not using water during bathing.
• Soap utensils, stack on the side, and then wash them in a batch.

How long should I turn on the electricity in the boiler?

The actual amount of water consumed is what should dictate the duration of operation.
Therefore each user must learn his usage needs.

Each boiler has a thermostat that stops the heating element when the water reaches the temperature to which it is set.

The length of time the boiler is in operating mode when the switch is turned on is not necessarily equal to the length of time the heater actually operates.

This is because the thermostat stops the heating element when the water reaches the temperature to which it was set. When the water temperature in the boiler drops below the set temperature, the heating element will start to operate again.

The longer the boiler operates, the greater the amount of hot water that will be available to you.

Therefore, if more water is heated than what you consume, the rest of the hot water in the boiler cools down, causing a waste of energy and money.

It is clear that this phenomenon cannot be completely prevented, but it is possible to try to estimate the amount of water consumed by the members of the household, because this assessment will enable savings. Several attempts should be made to find out what is the most appropriate operating time in the different seasons.

What temperature is the thermostat set to?

In principle, the boiler leaves the Nimrod manufacturing facilities with the thermostat set to 60°C.

It is recommended not to modify this setting.

What happens when you forget that the boiler is turned on?

Each boiler has a thermostat that stops the heating element when the water reaches the temperature to which it is set.

If you forget the power switch is on, the boiler will reach the desired temperature and stop the heating operation. The disadvantage is that every time the water cools down a little, the heating element will operate again and you will lose energy.

Does installing a heat accelerator help save money?

A heat accelerator is installed In Nimrod’s standing solar water heaters, as standard, in order to save electricity.

A heat accelerator is a plastic sleeve installed in the lower part of the boiler around the heating element, which functions to heat small amounts of water. As a result, the heated water around the heating element is fed directly to the top of the boiler, reducing the mixing of the hot water in the cold water.

This shortens the heating time for small amounts of water.

The most notable shortcoming of the accelerator is the increased scale formation on its walls. It can even become clogged, causing the heating element to burn out.

In ordinary electric boilers (without solar panels), the installation of an accelerator is prohibited.

On the other hand, when it comes to solar water heaters in which the electric heating element is activated for relatively short periods of time, especially in the winter months, a heat accelerator leads to savings in electricity consumption.

Why is it not possible to install a heat accelerator in horizontal (lying) boilers?

The heat accelerator is made of a plastic sleeve and is installed around the heating element. The sleeve can collapse into the heating element and burn, so a heat accelerator must not be installed in lying boilers.

How does the accumulated scale around the heating element affect the boiler?

Scale buildup is particularly slow in solar water heaters that operate most days of the year by heating from the sun. However, as the amount of scale increases, it takes up a significant portion of the boiler’s volume.

This phenomenon slows down the rate of water heating—and increases power consumption.

In such a situation, the electrical energy is only partially used to heat the water, while the rest heats the scale.

The result: a reduction in the amount of hot water that could have been obtained, compared to before the significant accumulation of scale in the boiler.

If the time required to heat the water becomes longer, contact a licensed Nimrod installer to see if this is due to excessive accumulation of lime scale.

Cleaning excessive build-up of scale from the boiler will reduce heating time—and save electricity.

For your information:

We know the phenomenon of scale accumulation from kettles:
Heating turns the salts and minerals in the water into limescale, and over time limescale accumulates on the sides of the kettle in large quantities, especially at the bottom.

This also happens in the boiler. The amount of scale that accumulates in the boiler depends mainly on the temperature to which the water is heated, the extent of the hot water consumption in the household, and the quality of the cold water flowing into the boiler.

Why in winter do you feel that there is less hot water from the solar water heater than in summer?

1. The temperature of the water entering the boiler in the winter is colder than in the summer months, so we need more heating time for the water.
2. Our body needs a higher temperature of hot water than in the summer.
3. In the winter months the average solar radiation is lower than in the summer months, and there are fewer hours of sunshine. In addition, the sun’s angle in relation to the ground changes. As a result we will feel that the boiler does not heat water the same way on cloudy or rainy days as it does in the summer.

How does the accumulated scale in the solar panel affect water heating from the sun?

The accumulation of scale in solar panels is slow and depends on the heating temperature and the extent of hot water consumption in the household, and to a large extent on the quality of the cold water flowing to the boiler from the local authority. As we know, the water supplied to us by the local authority contains salts and minerals. When overheated, these become scale.

The scale that accumulates in the solar panels accumulates mainly on the walls of the pipes. Over time, this clogs the water passage. When heating water from the sun, the sun will first heat the scale and then the water in the pipes, which delays the water heating and means that only a small amount of water is heated.

Furthermore, choosing a suitable panel for the boiler volume is critical. A high-output panel will heat a large amount of water quickly and will cause accelerated scale formation and rapid blockage of the panel with scale.

Cleaning the excessive build-up of scale from the panel will reduce heating time—and save electricity.

Cleaning the collector from excessive build-up of scale will reduce heating time – and save electricity.