How much energy does a boiler consume to maintain temperature

How much energy does the boiler consume: calculations and indicators per day and month

Our Ariston boiler is 80 liters. consumes too much energy. How much electricity consumes a quality boiler of this brand?

There are a lot of factors affects the consumption of electricity by electricity. In addition, there are various models and the same boiler with a volume of 80 liters can consume both 1.5 and 3 kilowatts. If you do not have an instruction for the boiler, you need to find out the name of the boiler model and find its characteristics on the Internet, I do not think that the model is old, so the difficulties should not arise.

In your case, it is possible that the boiler consumes all 3 kilowatts, however, it is possible that the time has already come to clean the boiler from scale. In addition, electricity consumption is also affected by how often you use the boiler. With frequent use of hot water, the boiler needs to get the missing volume and heat water again, so a certain amount of electricity consumes a long period of time. So, some of the accumulative boilers, because of this feature, can consume electricity even more than any models of running water heaters.

To give a more exhaustive answer, you need to know more information about your water heater and the use mode of it

As I understand it, we are accumulating water heater.

To find out exactly how much your boiler consumes electricity, you can turn off all the electrical appliances and leaving only a boiler to detect on the clock, how much it wraps a kilowatt per minute. Well, multiply by 60. So you will receive the average amount of electricity consumed by the boiler.

You can score the boiler number on the Internet and see all the info on it.

You can remove the lower cover and look on the outer side of the heating element, it is written how many kW are.

I can say with great confidence that the boiler is 80 liter, it doesn’t matter whether it is “ariston” or some other brand, consumes at least 1.5 kW per hour, but not more than 3.

General consumption depends on how often you wash, wash, wash the dishes, etc.D. That is, it is important to know the number of people-consumers and the time of year-summer, winter, autumn, spring. As you know, the consumption is less in winter, and in the spring and autumn more.

The average heating time is 80 liters to a temperature of 75-80 degrees, is 170-180 minutes. This is at the output of about 160 liters of hot water. Based on this, the average value can be calculated something like this:

Hygienic needs: hand washing, brushing, washing dishes, washing, shower, if access without restriction, then consumption, offhand lithers 250 hot (temperature 35-40 degrees) water per person per person. In the economy mode, you can do with 100 liters.

That is, through simple arithmetic manipulations, if not to turn, we receive on average, consumption, from 7.5 to 15 kW per day per adult.

We had a 100 liter Ariston and a day, together with our wife, managed to profit 27-32 kW per day (he personally led statistics). Now we are four, we have a gas boiler and we get only 7-10 per day.

Someday, how much electricity would go to the work of the average boiler? We counted.

A storage water heater, it is also a boiler, can be installed in apartments without hot water supply as an alternative to a protected water heater. for example, a gas column. Is such an alternative profitable? Let’s try to calculate in this article.

Types of water heaters

Water heaters are the following types:

  • Castle. The design of the water heater is a plastic case with a heating spiral, which is attached to the mixer. Water passing through a spiral warms up to 45-50 degrees. The greater the water speed, the lower its temperature. Such a model is indispensable in the country, in the village or in garden houses.
  • Accumulative. The boiler has a storage tank in which a spiral is built. When the water cools, the temperature sensor is automatically triggered and turns on the heating function. Inside the boiler has layers of insulation, preventing water cooling. The advantages are obvious: water heating is carried out around the clock. This type of equipment is suitable for families with children, as well as older people.

If we consider energy consumption, then the flow and storage device consumes approximately the same amount of energy per day.

The fact is that the flower heats the water as you use, and the boiler supports the given temperature all the time. Therefore, voltage surges on the network (you may notice how the counter quickly shakes the disk) will be very noticeable when using a running water heater.

A boiler releasing heat from an existing heating system is called an indirect heating device. about this here:

Boiler device

Each drive has in its design the following main parts: a metal reservoir in which the heating plants are located-special elements for heating water; special devices providing automatic heating of water and supporting a certain temperature.

There are two wide classes of heating devices:

  • The specifics of the work of accumulative models are the accumulation of water in the tank with its further heating.
  • Function heating devices do not delay the water and warm it during the movement through the pipe system.

Most often, boilers are installed near the places of the general water supply system (bath, toilet, kitchen). There are many models on the modern market that can be mounted on the wall or put on the floor. Also models differ in a vertical or horizontal design.

Types of water heaters

The principle of operation of household devices of water heating is the transfer of heat in the water heater from heating elements through the metal shell of the heater or fuel combustion chambers and in maintaining a certain volume of water in a heated state for a rather long time. Water heaters are of a prototic type in which water heats up in the flow, and accumulative, having a tank of a certain container in the heat.insulating shell.

In a stable water heater, the time of heating water is small, but the flow is limited. This property is useful when you need to quickly use a small amount of hot water, for example, wash your hands or dishes. Such a water heater does not even require a water supply, it is enough to raise a storage tank, fill it manually and pass it through the water heater by gravity. This model is best used in the country, where you need to quickly heat water for a short use of use.

By type of fuel used, water heaters are:

The factors that affect the time of water heating the time of heating water depends:

Best, that is, faster, water heats up in a water heater using an open flame, since in it the power is limited only by the amount of loaded solid fuel or the consumption of liquid and gaseous fuel per unit of time. The heat transfer area can also be made large: you need to install a tubular heat exchanger with a large number of tubes in the tank, how much will fit into the boiler. Water heats up very quickly, so such devices are best installed in places that require heating large volumes, for example, in the heating system of the house.

much, energy, does, boiler

Electric boilers are limited by the power of the electrical wiring, most often not more than 2.5 kW, and the TEN area. The water in them heats up much slower. In order not to waste time, it is better to heat water in advance and store in a thermal insulated capacity. The drop in temperature in modern boilers does not exceed 15 degrees per day, which leads to a slight loss of electricity.

It is very important to maintain the heating process without the formation of scale, since the growth of the scale creates a layer of thermal insulation. This leads to considerable difficulty in heating, the revenge of electricity and overheating of the heating. To do this, you need to choose a boiler with a low.temperature heating system of increased length. They quickly heat the water due to the large heat transfer area and do not overheat it until the scale is formed. In addition, a system of automatically maintaining a given temperature and protection against overheating of heating elements should be applied in case of insufficient water in the boiler.

What is needed to increase the supply of electricity to 15 kW?

It is necessary to come to the territorial management of the operator and submit an application and a package of documents there to receive TU:

After that, the network organization will issue technical conditions. When (and if) they are completed, representatives of the network organization will come and connect you to the mains.

TOP-10 electric boilers per 100 kV meters

Electric boilers suitable for heating a house at 100 m2 are represented in different price categories. They are popular as domestic, as foreign products. The top 10 presents the best boilers, the capacities of which will be enough for the rapid heating of a private house.

Evan Warmos-IV-9.45 9.45 kW

Heating equipment made of stainless steel and equipped with powerful heater. The presence of an electronic thermostat provides an optimum temperature in the room with a minimum electricity consumption.

In this case, you can set some parameters by hand.

The product can be used as an independent heating device or installed with other sources of heat supply.

  • power. 9.45 kW;
  • Efficiency. 94.5%;
  • heated area. 100 m2;
  • The temperature of the coolant is 5-85 ° C;
  • dimensions. 38x64x24.5 cm;
  • Weight. 27 kg.

Evan Next 12 12 kW

Electric heater from a well.known manufacturer, suitable for small houses. Is a monoblock combining the boiler and control panel.

May act as a backup or main heat exchanger.

Provides radiators to heating to 85 degrees.

The thermostat turns off the device when heated to a maximum temperature for safety purposes.

  • power-6-12 kW;
  • Efficiency. 99%;
  • heated area. 120 m2;
  • The temperature of the coolant is 30-85 ° C;
  • dimensions. 20.5x60x10.5 cm;
  • Weight. 8 kg.

Zota9 lux 9 kW

Heating device from a well.known brand from the luxury series is a modern model working from electricity. Equipped with a special GSM module for process automation.

The device itself determines the optimum temperature by determining the conditions in the room and on the street.

It is very simple to manage the unit: it is enough to use the application on the smartphone to control its work.

  • power. 3. 9 kW;
  • Heated area. 90 kV.m;
  • The temperature of the coolant is 30. 90 ° C;
  • Dimensions. 29x73x16 cm;
  • Weight. 18 kg.
  • convenient display;
  • management from the phone;
  • street temperature sensor;
  • freezing protection;
  • Connection of a warm floor.

Evan Expert 9

A powerful heating device, the power of which varies from 1 to 9 kW. The process is fully automated: the parameters are exhibited without human participation using special sensors that determine the street and room temperature.

The design has several heating elements providing rapid heating of the room.

  • power-1-9 kW;
  • Efficiency. 99.5%;
  • heated area. 90 m2;
  • The temperature of the coolant is 10-85 ° C;
  • dimensions. 42 × 76.5 × 30 cm;
  • Weight. 41 kg.

Protherm Ray Ray 12 KE /14 12 kW

The device is installed on the wall, which allows you to save a beneficial space. Thanks to an attractive design, you can hang a device in any room.

Power is enough for effective heating and maintaining comfortable conditions in the house up to 120 m2.

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Heating elements are made of high.strength stainless steel, resistant to corrosion processes.

  • power-6-15 kW;
  • Efficiency. 99.5%;
  • heated area. 150 m2;
  • The temperature of the coolant is 22-85 ° C;
  • dimensions. 41x74x31.5 cm;
  • weight. 24 kg.

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Evan Expert 12

Modern heating equipment manufactured in accordance with the needs of consumers. A reliable and practical product is able to warm up the room up to 100 squares in a short time.

You can set different operating modes, which is very convenient to do thanks to a thoughtful control system.

  • power-1.3-12 kW;
  • Efficiency. 99.5%;
  • heated area. 120 m2;
  • The temperature of the coolant is 10-85 ° C;
  • dimensions. 42 × 76.5 × 30 cm;
  • Weight. 41 kg.
  • quickly heats the room up to 60 m2;
  • large selection of settings;
  • maintenance of temperature;
  • the boiler does not overheat;
  • Moderate price.

Vaillant Eloblock VE 12 12 kWh

A wall type of device that will save space and quickly warm the house. Made of quality materials.

Will I save gas by turning my boiler stat down ?

Differs in a stylish and modern design.

Power can be adjusted from 3 to 9 kW. Connection is provided only to 220 in.

Use is very simple and safe, since there is a well.thought.out control panel and the availability of freezing protection.

  • power-3-9 kW;
  • Heated area. 90 kV.m;
  • The temperature of the coolant is 25-85 ° C;
  • Efficiency. 99%;
  • Dimensions. 41x74x31 cm;
  • Weight. 32.9 kg.
  • expansion tank;
  • Beautiful design;
  • simple installation and management;
  • convenient temperature control;
  • Fast warming up the room.

Resource EVPM-9 9 kW

One of the most popular boilers working from electricity. Designed for water heating of the house. Connected to the network 280 V and 220 V.

Autonomous use is provided and together with heating equipment operating on solid fuel.

  • power-1.33-12 kW;
  • Heated area. 120 kV.m;
  • The temperature of the coolant is 10-85 ° C;
  • Efficiency. 99.5%;
  • Dimensions. 42 × 76.5 × 30 cm;
  • Weight. 41 kg.

Kospel Ekco.L2 12 12 kW

The equipment works effectively in the heating system and together with an indirect heating boiler. Controlled using a room regulator.

You can program different modes for the time of day.


The costs of paying electricity consumes on how much electricity consumes the water heater. There are three types of heating equipment and each of the options has its own characteristics:

How to Make Your Boiler Efficient | Homebuilding

  • Accumulative water heater. Is a tank of different volumes, with a heater inside. Water heats up to a certain temperature, after which the heater is turned off. Control over the process is performed by a special sensor. When the temperature decreases, below set, the heater turns on and brings the temperature to the required. This leads to an overrun of electricity, if you do not use the heated water in time and do not turn off the device. The assortment of electric heaters with the heater is quite extensive.
  • Empty water heater. The device has no tank. Water moves through pipes, enters the heater. Passing through it, water reaches the required temperature. How much such a water heater consumes, it will depend on the temperature of the water at the input.
  • Indirect water heater. Water heating in the tank is carried out due to the heating system. It can be a central heating or gas boiler. Thanks to the functional features of the boiler, the water in the heater remains hot, even after disconnecting the main heat source. Thanks to an additional thermal insulation system, the volumes consumed by an indirect heating boiler are very insignificant: due to indirect use of electricity, significant savings in the means are noted.

Through calculations and observations, it was found that a prototing type of devices consume a larger amount of electricity, since they have a greater power. But on the other hand, flowing systems are included periodically, while the accumulative are constantly used. The power of the accumulative water heater is different, so they cannot be called completely energy.saving.

Do not spend a lot and choose the right heating device, it is possible if you find out how much energy the boiler consumes per day.

To make calculations, you need to know the following indicators: the capacity of the water heater, the power of the device, the water consumption, the time required to heat water to the desired temperature and the power consumption of the device in watts.

There are approximate tables that allow you to estimate what volume of the tank will be required for comfortable use. For example, it is enough for one person to install a water heater with a volume of ten to thirty liters, while the first number is the minimum volume, the latter is normal. For a family of two people, you need a fifty liter boiler. A classic family of two adults and two children needs a water heater with a volume of one hundred to twenty liters.

Experts recommend on average to count on one person fifty liters of water per day. It is worth noting that the numbers can be much lower or higher. It all depends on the needs for the use of water: cooking, compliance with personal hygiene, washing, washing dishes, taking a bath or shower. There are established norms of water consumption per person: for a day for washing, about eighty liters are needed, about twenty liters for washing dishes, bathing in the bathroom. about one hundred eighty liters.

But when buying, not only litting is taken into account. Since cold and hot water is mixed, the consumption is less.

much, energy, does, boiler

Calculation of the consumed amount of hot water per day

The cost, size and power of the boiler depends on this indicator. For a family with one child, at least 25 liters are consumed per day. This indicator includes: washing dishes and hands, manual washing and light shower. If the family has two children, then up to 250 liters are spent per day. This includes: the adoption of the bath, the work of the washing machine, as well as wet cleaning. Such calculations are approximate, as they are formed based on customer reviews. The exact data can be found by setting the counter. The total indicator should be divided into the number of days. Thus, water consumption per day will be obtained. Therefore, it can be determined which boiler is the most economical.

Consider an example of calculating the consumption of the amount of hot water for three people. On average, the family consumes about 70 liters of water per day. The temperature in the boiler can heat up to 90 degrees, and in the central water supply. up to 60 degrees. Thus, hot water in the boiler is mixed with cold and gives more warm water than necessary. Therefore, it is recommended to buy a boiler with a volume of 40-50 liters.

What is the most economical boiler

The fact is that with very economical operation, consider. “heating, only when necessary” the excessive volume of the boiler becomes somewhat wasteful. Hot water unused for its intended purpose will eventually cool and give heat to the heating of the dwelling. The overspending will not be conditional 0.5 kW, as if in the calculation, but all 2.0 kW per day, for example but with active operation, “always heated water to a maximum and a large consumption”, this almost loses its meaning

Therefore, for great savings with a boiler, its volume must be minimally realistic. But at the same time, he should not cause great inconvenience, in terms of lack of hot water.

It is best to use practical recommendations from operating experience, and from specialists.

The cost of water consumed when installing a storage water heater

Consider the cost of water consumed when installing a storage water heater. For example, take a water heater with a volume of V = 30 liters with the installed power of the heat heater (heater) 1.5 kW.

When installing an electric water heater, the connection to a hot central water supply is not required, since the water heater is connected to the cold water supply system and to the power supply system and heating hot water itself. Accordingly, water consumption will be made only from the cold water supply system. A receipt for electricity will be added to the receipt for consumed water.

Take the temperature of hot water, which reaches the final consumer equal to the tgor = 60 ° C (the so.called “economical regime” for a storage water heater). We take the temperature of cold water equal to thol = 10 ° C.

The average water consumption when washing dishes, morning and evening water procedures will leave the same Q = 4 l/min, as when calculating when connecting to hot central water supply, since the mixer remains the same. Accordingly, the consumption of hot and cold water for the temperatures of mixed water 35 ° C, 40 ° C and 45 ° C remains the same as when calculating when connecting to hot central water supply.

With an average consumption q = 4 l/min, water consumption per month from the cold water supply system will be 3.6 cubic meters.m.

At the cost of cold water for consumers equal to 13.97 per 1 cubic meter.m, the cost of cold water will cost you 50.3 rubles

To heat 30 liters of water to the temperature difference (the temperature of the water at the input is “cold” and at the “hot” output) ∆t = 45 ° C is required 1 hour 5 minutes (from passport data).

Accordingly, the heating of 30 liters of water to tgor = 60 ° C will occur in 1 hour 30 minutes or 1.5 minutes per heating 1 degree or heating 1 liter of water to tgor = 60 ° C will occur in 3 minutes.

Consumed electricity of the accumulative water heater V = 30 liters when cold water is heated to tgor = 60 ° C:

When using hot water on average a day 30 minutes, the average consumption of hot water per day, respectively, is 60 liters. Time spent on heating “mixed” (when consuming hot water, cold water enters the drive) water is 1 hour.

Consumed electricity for heating hot water in the storage water heater is

Within a month (an average of 30 days), the average consumption of hot water per month will be 1.8 cubic meters.m., It is necessary to spend electricity in the amount of 45 square meters on water heating.h.

If you do not use hot water, then in the storage water heater it is necessary to maintain a constant water temperature during the day. To maintain water temperature during the day, the heater is equipped with a temperature sensor with a power control regulator ∆ht = ± 2 ° C. T.e. With a decrease in temperature to the minimum level, the heater and water heating on 5 ° C and subsequent disconnection will be turned on. Knowing the thermal conductivity of the insulating walls of the water heater and knowing that for heating 1 degree it takes 1.5 minutes, then on average the heater is turned on for 30 minutes. This is the so.called electricity consumption of “idle”:

About this, manufacturers of storage water heaters try not to spread.

As a result, per month, the consumption of electricity for heating hot water in the storage water heater is 67.5 kW.

At the cost of electricity for urban residents

3.44 per 1 kW.h (houses with gas stoves).For residents of rural areas and houses with installed electric stoves

Electricity tariff for 1,41 per 1 kW.h. Data at a temperature of mixed water 40 ° C and 45 ° C are presented in table 2:

Calculation of the cost of water supply per month when installing a storage water heater. Table.2

Mixed water temperature, OS Average water consumption, l/min Water consumption per month, cube.m The cost of consumed water per month,
mixed mountains. Hol. mountains. Hol. Total
35 four 2 2 1.8 1.8 3.6 50.3
40 four 2.4 1.6 2.16 1.44 3.6 50.3
45 four 2.8 1.2 2.52 1.08 3.6 50.3
Mixed water temperature, OS Consumed electricity, kV.h. The cost of electricity consumed, Total,
City. agriculture. And at home with email.slabs City. agriculture. And at home with email.slabs
35 67.5 232.2 162.67 282.5 212.97
40 85.5 294,12 206 344.42 256.3
45 91.5 314.76 220.5 365.06 270.8

When installing a storage water heater, it is necessary to take into account, and (for hot and cold water).


An example of calculating the boiler consumption

Suppose there is a boiler with heat loss 0.5% per hour, and a day for the family is required for 200 liters of water. Cold water temperature is 10 and hot 55 degrees. From here we have:

We will substitute these values ​​in the first formula:

W = 0.0016 x 200 x (55. 10) = 14.four

much, energy, does, boiler

It turns out that you need 14 to heat water.4 kilowatts per day, or 432 per month.

Now let’s take into account heat loss. We already know the number W, and P will be 0.5. We substitute values ​​in the formula and get:

W1 = 14.4 x (0.5 x 24 100) / 100 = 16.128

This means that the average daily consumption of electricity by the water heater is 16.128 kW, and for a month. 483.84 kW.

How much energy consumes the water heater?

The consumption of electricity by the water heater is different depending on the power of the heater, the volume of the container, the amount of hot water used daily and some other factors, including the design features of the device. Only indicative data on energy costs can be given. For example, a storage water heater with a volume of 50 l consumes approximately 1-6 kW per day. The flow heater with short-term use consumes no more than 1.5-2 kW. In general, the power consumption of devices can be very different. To find out how much the water heater consumes under specific conditions, it is necessary to consider separately the types of heaters and perform some calculations.

Electricity costs for the operation of the storage device

A storage water heater. a tank with a tubular heater inside (Ten), which heats the water to a given temperature, then turns off. Good thermal insulation of the water heater allows you to use hot water for 3-5 hours after heating. When the temperature decreases, the heater turns on and heating the water. It is important to choose the device of the optimal volume so that the heated water is used on time without expanding electricity. For example, for one person, a heater is recommended by 10-30 liters, for two-by 50 l, for four-100 l and t.P.

The main parameters affecting the energy consumption of the boiler:

  • the temperature of the water entering the heater;
  • the temperature of the heated water;
  • hot water consumption per day;
  • Ten power;
  • the amount of electricity that the device consumes per hour;
  • The size of heat loss (in kilowatts or percent).

We solve the problem where the conditions: the heater power of a particular model of the device is 2 kW/hour, the temperature of the water entering the boiler is 15 ° C. In this case, the water in the boiler will heat up to a temperature of 65 ° C in 1.5 hours. Then for 1 heating per day it takes 1.5 hours2 kW/hour = 3 kW of electricity. In this case, it is necessary to take into account the energy that is consumed by the water heater in standby mode. The size of the heat loss is indicated in the technical passport of the device, for example, is 0.5 kW. Then 3 kW0.5 kW = 3.5 kW per day. We calculate the amount of energy consumption per month: 3.530 = 105 kW.

Calculation of the expediency of a flow water heater

The flow water heater is ideal for periodic use, for example, in the summer season.

It is easy to mount it and you can always take it with you. The only minus can be considered a short service life. up to 5 years.

[advice] is useful to know: the flowing water heater must be grounded, since it is attached directly to the metal mixer.[/advice]

Heating the flowing device occurs as water enters, while the power does not depend on the pressure. As a rule, such a device gives only warm water that can be washed or washed with dishes. To take a shower or bath, a flowing water heater is not suitable due to its design features.

It is advisable to stretch a separate electric cable, install a socket and an electric cork for the heater. Thus, you will unload the main network and make it more functional.

The power of running water heaters begins from 3 to 27 kW:

  • For a family of 2 people, a device is suitable for up to 10-12 kW;
  • For a family with several young children, it is better to purchase a device with indicators, at least 20-25 kW.

[Warning] It is worth noting: sometimes a powerful water heater requires a voltage of 380 volts. Read carefully the instructions for use and especially the technical characteristics.[/Warning]

If you take a negligent of this aspect and connect the equipment 220 volts, then at best you will knock out electrical traffic jams in the meter.

Calculation of energy consumption by a running water heater

We draw an analogy with the accumulative boiler and take as a basis the same indicator of water consumption. 50 liters per day. This is not as much as it seems at first glance.

much, energy, does, boiler

Now the productivity of the device should be scalcked: the standard power of the budget option is 4.0 kW/h and can produce warm running water in an amount of 2 liters per minute. In order to let 50 liters of water through yourself, a suppurate heater will need 25 minutes: 50/2 = 0, 42 hours or 25 minutes.

We calculate the energy consumption per day: 0.424.0 kW = 1.68 kW (this is the calculation of water heating to 45. 50 degrees). We multiply the daily indicator by 30 days and get 50.4 kW per month. For regional regions, costs will be 100, and for the city. 140 per month.

Of course, the flowing water heater is cheaper and does not require much space. But the temperature characteristics of the resulting water are inferior to the boiler.

There is a myth that the flow device pulls more electricity than the accumulative equipment.

Based on the calculations, we can safely say that this is not so. The calculation formula is briefly expressed using the mathematical equation: the amount of water (in liters, cubic meters) / capacity of the heater for power = indicator per day.

Always remember the safety rules! Do not touch the heater connected to the power supply network with wet hands, as well as wipe the surface with a wet rag during the device operation.

Watch the video in which the user gives reasonable tips on which water heater to choose. flowing or accumulative:

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