How much electricity a boiler consumes per month

How much electricity and money will use the boiler

Electricity is the most expensive energy source, but how much a conventional boiler will empty your ? Expenses will directly depend on how much hot water we will consume, and what its temperature is How much is the cost of a boiler (storage water heater) on average for the family? How to save when using a boiler, and which of them will be most profitable?

What volume of hot water consumed per day and per month? From what temperature to what we heat?

Let’s take the average statistical data: the consumption of hot water per day. 100 liters (3000 liters per month), its temperature is 60 degrees, the temperature of cold. 10 degrees.

To calculate the energy consumption for heating water we use the simple empirical formula. W=0.00116 V (T2. T1), Where V. volume, 100 liters, T2. end temperature, 60°C, T1. initial temperature, 10°C. So we get W=0.00116 100 (60.10) = 5.8 kW per day, or 174 kW per month.

But part of the energy from the boiler will be transferred to the air when cooling, and the water heater will turn on and maintain the temperature at a predetermined level It is believed that a modern storage water heater gives on average no more than 0.5 kW for heating a room per day. Then the daily electricity consumption for water heating is 5,80,5=6,3 kW, and for a month. 189 kW.

The figures of this calculation are not so small in the end. It turns out that you need to pay for electricity almost 1000 per month, with a tariff of about 5 /kW. And this is only for one boiler, without taking into account other energy consumption.

In reality, the operation of the boiler in 90% of cases is more economical than the above calculation. How to reduce the cost of the water heater?

The benefits of Ariston water heaters

The capacity of Ariston water heaters is quite substantial. Average heating time is 3,7 hours. Of the features can be distinguished magnesium anode and check valve. Thermometers are available in all models. In the installation of water heaters “Ariston” is quite simple. In general, the range of these products is very large. All this makes it possible to always choose the right option. The protection system against overheating is installed. The bodies of water heaters are reliable. In addition, it should be noted a good design of models. Thanks to all of these qualities, people are only positive about. Water heaters reviews are also excellent.

Calculation of electricity consumption

If you take the average consumption of water, then a family of three people per day takes 25 liters. This is enough for showering and household needs. For four people and daily bathing will require 250 liters. The calculations are simplified in the presence of a meter.

Important! When buying, you should consider not only the tank size. Do not forget that during operation, the hot stream is mixed with the cold, so a smaller amount of heated liquid is consumed.

So, how much does the counter run when using a boiler for 50 liters? The formula will help to figure it out:

We will take approximate figures. 2 hours, during which the heating occurs.

Looking in the documentation, we find that the power is 2 kW/hour. Hence 4 kilowatts per day. Now divide this result by the time the boiler is at rest: 4:12 = 0.3 kilowatts. That’s how long it takes to maintain the temperature of the water in the tank.

Now find out how much electricity you need per day: 4 0,3 = 4,3 kW. Multiply this figure by the number of days in a month: 4.3 x 30 = 129 kilowatts. To understand how much money it will cost to pay the bill, multiply this value by the cost of electricity in your area.

You think that a bigger water heater requires a lot of resources? Do a similar calculation for 80 and 100 liter heaters. Approximate time of heating of the bulk equipment. 180 minutes. Multiply 2 kW by three operating cycles and you get 6 kW. Calculation: 6 x 30 days = 180 kilowatts. This is the energy that will be used to heat water.

How much sense is it to install a storage tank? It depends on your needs. It will perfectly fit in the house where the water or electricity is often cut off. Thanks to the thermal insulation layer the unit retains heat well. Electricity consumption will depend on the frequency of use.

Calculations for the flow heater

The flow heater is recommended for country houses or as an additional source of heating in the house. Most often the devices are connected directly to the mixer, so they do not depend on the pressure in the main line. But the water at the outlet does not always have a comfortable temperature.

The documents indicate the degree of heating, which is summed up with the temperature at the inlet. For example, 40 degrees. So at an input of 15 ° C at the output you get 55 ° C.

So the flow type is more suitable for household needs. The exceptions are high power products, which require separate wiring.

For calculations, we take the average indicators: 50 liters per day and a capacity of 4 kW. Capacity. 2 liters per minute. The liter divided by the capacity: 50/2. We have 0.42 hours or 25 minutes.

Now 0.42 x 4 = 1.68 kW. If we calculate for a month (30 days), it comes out 50.4 kW. As you can see, the myth that the heater draws a lot of light is dispelled. The only thing in which the flow heater is inferior to the storage unit is the heating temperature. In the first case, it is not suitable for daily use.

Thanks to these formulas you can choose the technique rationally. The video will help you :

much, electricity, boiler, consumes

Calculation of consumed power per month

According to the set of rules SP 30.13330.2020 “SNIP 2.04.01-85 Internal water supply and sewerage in buildings” (approved by the Water Supply and Sewerage. The order of the Ministry of Construction and Housing and Communal Services) the average rate of hot water is set at no more than 3 thousand liters per person per month. In these standards, hot water is considered 65 ° C, and for the calculation of cold water inlet 15 ° C.

The time of complete heating of the boiler is calculated by the formula:

  • T=0.00116V(T2.T1)/W where:
  • V. boiler capacity in liters;
  • T2 = 65°C, T1 = 15°C. hot and cold water temperature;
  • W. installed capacity of the heating elements.

For the storage heaters with the capacity of 50 liters and power of 2, 5 kW, the cycle time will be 1.16 hours. To satisfy the monthly requirement of one user, 3000 divided by 50, we have 60 cycles. Maximum power consumption of the water heater per month 2,5×1,16×60 = 174 kW.

The same 2 kW water heater will have a cycle time of 1,45 hours and will consume a maximum of 2×1.45х60 = 174 kW.

Boilers of 80 liters with a 1.2 kW heater will heat up in 0.00116x80x50/1.2 = 3.87 hours and consume 1.2×3.87×60 = 278.64 kW per month.

With two heating elements of 1 kW, the 80-litre boiler heats up 0.00116х80х50/2 = 2.32 hours. According to the norms for one person, he will consume 2×2.32×60 = 278.4 kW per month.

An electric storage tank with a capacity of 100 liters and a 2 kW heating element will complete a full heating cycle in 0.00116x100x50/2 = 2.9 hours and on standard indicators will spend per month per person 2×2.9×60 = 348 kW.

much, electricity, boiler, consumes

The real electricity consumption depends on the water temperature at the inlet to the boiler and the set temperature at the outlet, the actual consumption and losses in the pipes of hot water. Before you buy a heater, a scrupulous calculation of hot water consumption will give significantly less than the normative result.

Calculation of the flow-through heater is simpler, the documents on it indicate the volume of hot water of 50 liters, the power of heating elements, as an option, 4 kW and a performance specified 2 l / min. This volume of water (50 liters) the device produces for 25 minutes (0,42 hour) and consumes 4х0,42 = 1,68 kW. If you take the standard consumption of 60 cycles will get 100.8 kW per month.


On how much electricity the heater consumes, depends on the electricity bill. There are three types of heating technology and each option has its own characteristics:

  • Accumulation heater. Represents a tank of varying volume, with a heater inside. The water is heated to a certain temperature, after which the heater is turned off. A special sensor monitors the process. If the temperature drops below the set temperature, the heater turns on again and brings the temperature to the desired level. This leads to overconsumption of electricity, if you do not use heated water in time and do not turn off the device. The range of electric heaters with a heater is quite extensive.
  • On-flow heater. The device does not have a tank. Water flows through the pipes and enters the heater. Passing through it, the water reaches the desired temperature. How much such a water heater consumes, will depend on the temperature of the water at the inlet.
  • Indirect water heater. The water in the tank heats up through the heating system. It can be central heating or a gas boiler. Thanks to the functional features of the boiler, the water in the heater stays hot for a long time, even after turning off the main source of heat. Thanks to the additional thermal insulation system, the volume consumed by the indirect heating boiler is very low: due to the indirect use of electricity there are significant savings.

By calculations and observations, it was found that the flow-through type devices consume a greater amount of electricity, because they have more power. But on the other hand, the flow systems are turned on periodically, while the storage systems are used constantly. Capacity storage-type water heater varies, so we can not call them fully energy efficient.

Not to spend much and choose the right heating device, it is possible, if you find out how much energy a 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, water consumption, the time required to heat water to the desired temperature and energy consumption of the device in watts.

How much electricity an air conditioner consumes

There are approximate tables that allow you to estimate how much volume of the tank will be needed for comfortable use. For example, one person is enough to install a water heater with a volume of ten to thirty liters, with the first number. the minimum volume, the last. the normal. A family of two needs a water boiler for fifty liters. A classic family of two adults and two children needs a water heater with a capacity of one hundred to one hundred and twenty liters.

Experts recommend that on average, count on one person fifty liters of water per day. It is worth noting that the figures can be much lower or higher. It all depends on the needs of water use: cooking, personal hygiene, laundry, washing dishes, bathing or showering. There are established norms of water consumption per person: for washing about eighty liters per day, for washing dishes. about twenty liters, bathing in the bathroom. about one hundred and eighty liters.

But when you buy one, it’s not just the capacity that counts. Since there is a mix of cold and hot water, the consumption is lower.

How to save money?

Of course, it is not reasonable to refuse completely the blessings of modern life, but in order to save money, you can pay attention to energy-saving refrigerators, because this device will work all year round, regardless of weather conditions. If you calculate how much energy your TV and computer use per month, you can quite affect that amount by choosing one appliance that works. Often a monitor which is on all day long is of no use and a working TV becomes the background to which we do our daily chores. It is not easy to get rid of such habits, but already in a month it will result in a reduced power bill.

  • Replace all lighting fixtures with new energy-saving or LED bulbs. The initial investment will be recouped by the savings and the long service life.
  • If you use the kettle often, always pour just the amount of water you need, not water to spare. Unfortunately they haven’t invented energy-saving kettles yet, but you are perfectly within your power to adjust the mode of usage.
  • Set the computer to a comfortable idle mode. In this case, it turns off automatically if a certain amount of time passes without any action. It will consume less power when turned on, which is also important.
  • Timely defrosting of the fridge and freezer is also part of the family savings. When the formation of a significant amount of ice on the walls increases the power consumption, so be sure to eliminate this factor.
  • Heat-reflecting screens can help heaters and convectors to be more efficient.
  • Replacing wiring and organizing local lighting in the kitchen or recreation area will also significantly reduce costs.
  • Using adapters and extension cords increases energy consumption.
  • Buying new electrical appliances, it is better to give preference to the economic class of consumption. The main items are shown in the table below.

One of the not common ways to save electricity is to install multi-tariff meters. This allows you to turn on some appliances at night, when electricity is cheaper. This practice has proved to be excellent in foreign countries, but unfortunately, has not yet caught on with us.

To completely abandon the use of electrical appliances is probably impossible in today’s world. Even a gas boiler and a heating convector must consume a certain amount of energy for their operation. If we are talking about a welder, boiler or air conditioner, the consumption is significant even with short-term use. Despite this, the consumer is buying more and more a variety of appliances, so it is not unreasonable to know the main “culprit” of electricity bills, as well as proven methods of reasonable savings that will help make costs less.

Capital water heater parameters

We take the consumption of 300 liters per day, which is enough for 5-6 people.

HVAC. Electricity Cost (kW) Power Consumption Calculation

Gorenje GBF 100 T/V9 for 100 liter has 1400 W heaters. Heating time 0.00116100(60-15)/1.4 = 3.7 hours. It would consume 300/1003,7 1,4 = 15 kW per day, for 30 days 466,2 kW.

much, electricity, boiler, consumes

Boiler Gorenje GBF 100 T/V9

The Bosch Tronic 1000 T ES 100-5 2000W BO L1X-NTWVB at 2000 watts will heat water in 0.00116100(60-15)/2 = 2.61 hours. 300/1002.61 2 = 15.6 kW per day, 469.8 kW per month.

Bosch Tronic 1000 T ES 100-5 2000W BO L1X-NTWVB boiler

Gas Boilers or Electric Heating. Which is Cheaper UK 2022

Atlantic O’PRO TURBO VM 100 D400-2-B at 2500 watts will heat up all the liquid in 0.00116100(60-15)/2.5 = 2.088 hours. It will consume 300/1002.088 2.5 = 21.6 kW per day, it will accumulate 648 kW in 30 days.

Boiler Atlantic O’PRO TURBO VM 100 D400-2-B

The night tariff should also be taken into account. It may be more profitable to heat a lot of water at night and then use it during the day. In winter time, the temperature of the water is much lower, which increases the heating time.

You can conclude that models with different parameters consume about the same amount of electricity. The price of high-powered devices can be several times higher, which is explained by their practicality. heating is faster.

Parameters of the capital-capacity water heaters

We take the flow rate of 300 liters per day, which is suitable for 5-6 people living.

Gorenje GBF 100 T/V9 for 100 liters has 1400 W heaters. Heating time 0.00116100(60-15)/1,4 = 3,7 hours. It will consume 300/1003,7 1,4 = 15 kW per day, for 30 days 466,2 kW.

Boiler Gorenje GBF 100 T/V9

Bosch Tronic 1000 T ES 100-5 2000W BO L1X-NTWVB for 2000 watts will heat water for 0.00116100(60-15)/2 = 2.61 hours. 300/1002.61 2 = 15.6 kW per day, 469.8 kW per month.

Boiler Bosch Tronic 1000 T ES 100-5 2000W BO L1X-NTWVB

Atlantic O’PRO TURBO VM 100 D400-2-B 2500 watts will heat the entire liquid in 0.00116100(60-15)/2.5 = 2.088 hours. It will consume 300/1002,088 2.5 = 21.6 kW per day, it will accumulate 648 kW in 30 days.

Atlantic O’PRO TURBO VM 100 D400-2-B boiler

The night time tariff should also be taken into account. It may be more profitable to heat a lot of water at night and then use it during the day. In winter time, the temperature of the water is much lower, which increases the heating time.

It can be concluded that models with different parameters consume approximately the same amount of electricity. At the same time the price of powerful devices can be several times higher, which is explained by the practicality. the heating is faster.

| Denial of responsibility | Contacts |RSS