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Bosch Hinnakiri 202012.7M

To simplify your choice

Gas water heaters JUNKERS Minimaxx

JUNKERS has been producing gas water heaters for over 100 years. The current product range includes 4 models with the smallest possible dimensions. Therefore, the generic name of the product family is “Minimaxx”.

The most important parameter of a gas water heater is its capacity. It depends on how much hot water you can get. Water heating is most difficult in the heart of winter, when the temperature of the incoming cold water can be +4 … + 5? C. In order to raise the temperature by 35 ° C (to +40 ° C) and achieve a hot water output of 10 l / min, a water heater with a capacity of at least 24 kW (350 kcal / min) is required. The power and dimensions of the devices are related: the more powerful the device, the larger the device.

The combustion residues of the gas are directed to the chimney, to the duct intended only for gas smoke. All water heaters sold today have a draft sensor that switches off the appliance in the event of insufficient draft in the chimney. Such a device is your lifesaver if it switches off after five minutes of operation and forces you to ventilate the room. The more powerful the appliance, the better the draft and the larger the diameter of the flue, the greater the amount of combustion residues.

All Junkers Minimaxx models have flame modulation. This means that the gas flame is reduced at low water consumption and increased at higher levels. This keeps the leaving water temperature constant. However, we do not recommend choosing a lever mixer as a shower faucet, as compensating for possible temperature fluctuations is cumbersome.

The main burner of the gas water heater is always ignited by the pilot flame, but there are several ways to ignite the pilot flame. On cheaper devices, the alarm flame is ignited manually from the spark generated by pressing the piezo button. In electron-ignition devices, energy is generated from the hydrogen generator both to generate a spark and to open the gas valves. It is a water-powered electric generator. In addition to saving gas, electronically heated water heaters also have the advantage of ease of use. The user does not have to light a pilot flame in the morning, which does not always want to ignite due to air in the piping or a weak piezo spark.

The most powerful gas water heater, WRD18-2G, also has a display that allows you to see the leaving water temperature.

All “Minimaxx” water heaters are factory-set to run on natural gas, but can be reconfigured for LPG, for which the appropriate kits are available.

The water heaters are supplied by the Junkers assembly plant in Portugal.

When installing all equipment, of course, the local installation requirements, ie those in force in Estonia, must be observed.

The pilot flame devices are WR11-2P and WR14-2P .
Hydrogen generators are WR14-2G and WRD18-2G .

Explanation of type designation
W – The first letter of the type designation of the water heater, all gas water heaters
R – Automatic power adjustment. Less water – less flame, more water – more flame. The gas flame is modulated automatically depending on the amount of water flowing through.
D – Display. Outlet water temperature display.
11 – maximum power of the device: 19.2 kW = 11 l / min (Δt ° = 25 ° C) = 5.5 l / min (Δt ° = 50 ° C)
14 – maximum power of the device: 23.6 kW = 14 l / min (Δt ° = 25 ° C) = 7 l / min (Δt ° = 50 ° C)
18 – maximum power of the device: 30.5 kW = 17.6 l / min (Δt ° = 25 ° C) = 8.8 l / min (Δt ° = 50 ° C)
2 – Generation ID
K – The flue of the appliance is connected to the chimney
P – The pilot flame is ignited by pressing the piezo button
G – The gas flame is ignited automatically when the hot water tap is opened, but the energy of the spark is taken from a generator powered by running water.

Simmo Paomets
Gaspre technical manager

To simplify your choice

JUNKERS gas heaters

Gas heating appliances are such gas heating appliances which, in addition to the burner, gas fittings and heat exchanger, also contain the parts necessary for the operation of the heating system: circulation pump, diaphragm expansion tank, safety valve, etc. Gas heaters can be hung on the wall and their power is usually 20… 35 kW – in the case of a device with a lower capacity, it is not possible to obtain sufficient hot water through the flow. Gas heaters are used for heating small (up to 300 m2) private houses and apartments and for the production of domestic hot water.

Heaters are different…

1. … in terms of the ignition principle of the main burner.
1.1 For pilot flame devices, the main burner is ignited from a continuously burning watch flame.
1.2 Electronically ignited devices are ignited by an electronically generated spark.
Junkers no longer produce any pilot flame devices. Electronically ignited devices are convenient for the user as there is no need to start manually.

2. in terms of combustion chamber construction.
2.1 Equipment with an open combustion chamber takes the air needed for combustion from the installation room and the combustion residues are directed to the chimney with natural draft.
2.2 Equipment with a closed combustion chamber includes a fan, by means of which the combustion residues are directed out through a special coaxial pipe and the combustion air is taken from the yard. In the absence of a better one, we call them “turbo” devices.
Appliances with an open combustion chamber are used if a suitable chimney with sufficient draft is available. The height of the chimney must be at least 4 meters and gas smoke must not be led into the same flue as solid fuel stoves or ventilation. “Turbo” devices are used when there is no chimney or when a short chimney does not provide sufficient natural draft.

3. in terms of the principle of domestic hot water production
3.1 Domestic hot water is produced by flow. The flowing water is heated, so the power required is high.
3.2 For domestic hot water, there is a tank in which the water is heated before consumption.
Flowing hot water production means that the appliance only produces hot water when the water tap is open. Such production of domestic water does not allow hot water to be obtained from the tap if the water flow is lower than the application level and does not allow to obtain more water than the capacity of the device allows. 20kW power means, for example, domestic water productivity with a temperature rise of 6 l / min? T ° = 50 ° C. It follows that equipment in which domestic water is produced by flow-through is only suitable for the needs of one family. If the hot water demand is higher or several consumers need water at the same time, then the only solution is to prepare the domestic water in the hot water tank.

4. … in terms of automation connectivity
Automating the operation of the heater is important for any heating system, providing savings in heating costs.
4.1 Setting the temperature from the boiler thermostat. In the simplest case, the user can manually adjust the parameters of the water leaving the device, but this usually tends to be delayed, which increases energy consumption.
4.2 Operation control of the room thermostat device. The apartment, the temperature of which is maintained by a room thermostat, must not be large (up to 80 m2). As the minimum heating capacity of the equipment is usually 7… 10 kW, in the case of small apartments, the room sensor prevents an excessive rise in the temperature of the apartment. The right choice of pilot room is very important to ensure the proper operation of the heating system. Better room thermostats allow you to set heating and saving times in a programmed manner, which also lowers heating costs. Heating in a system controlled by a room thermostat is cyclical: rooms are heated; then there is a waiting time and the rooms cool down; then heated again. NB! In a warm room, the radiator may be cold.
4.3 Controlling the operation of the device according to the outdoor temperature. The outdoor temperature automation calculates the temperature of the water entering the heating system according to the outdoor temperature according to the set heating schedule. Thus, the heating system is constantly running and the radiators are warm all the time, but when the outside temperature drops, their temperature rises and when it warms up, it drops again. In general, the automation also includes a timer that can be used to control the switching between heating and economy modes. Such temperature control is used in larger apartments and houses and in systems where radiator heating is combined with water floor heating.
5 … by product family
5.1 Ceraclass – ZW14-2DH KE, ZW14-2DH AE, ZS14-2DH KE, ZS14-2DH AE
The Ceraclass product family includes four models: a chimney connection and a turbo version for both direct domestic hot water production and connection to a tank. The heating capacity of the equipment is 14 kW, but still 24 kW for better production of domestic water. ZW units have a plate heat exchanger for domestic water production and the burner flame is modulated according to both the leaving water temperature and the flow rate. In ZS devices, the switch directs energy to the hot water tank if domestic water is required. The devices only allow you to add a room thermostat to control the heating. The equipment is supplied by the Junkers Potugal assembly plant.
5.2 CeraclassSmart – ZWA 24-2K, ZWA 24-2A, ZSA 24-2K, ZSA 24-2A
In appliances where hot water is produced by flow, the hot water circuit is located in the primary heat exchanger. In units with a boiler option, the energy is routed by means of a switch valve in the heating circuit of the tank – so a separate boiler charging pump is not required. In heating mode, automatic power setting (flame modulation) takes place according to the heat demand. The devices only allow the use of a room thermostat to control the heating. The equipment is supplied by the Junkers assembly plant in Turkey.
5.3 CeraclassExellence –
ZWC24-3MFK, ZWC24-3MFA, ZSC24-3MFK, ZSC24-3MFA
ZWC28-3MFK, ZWC28-3MFA, ZSC28-3MFK, ZSC28-3MFA
ZWC35-3MFA, ZSC35-3MFA

Equipment with a chimney connection of 24, 28 and 35 kW and a “turbo”, for the production of domestic water by flow or in a hot water tank. Equipped with a Bosch Heatronic-3 control unit and allows heating to be controlled by the outdoor temperature or by means of a room thermostat. When using additional automation FR or FW, it is possible to cascade the boilers and add different heating circuits. The combined DHW comfort level has been maximized (the DHW heat exchanger is kept constantly warm if necessary) and DHW recirculation can also be used if required. The equipment is supplied by the Junkers assembly plant in Turkey.

Explanation of type designation
Z – central heating (Zentralheizung)
W – the unit has a flow exchanger for the production of domestic hot water (Warmwasser)
S – the switch in the device allows hot water to be produced in a boiler (Speicher)
D – Display
H – Horizontal mounting plate
A – CeraclassSmart devices
C – CeraclassExellence series models
14; 24, 28 or 35 – The power of the device in kilowatts
2 or 3 – Product Generation Symbol
K – to connect the chimney (Kamingerät)
A – closed combustion chamber unit (Aussenwand)
MF – Multifunctional dashboard and digital control
Simmo Paomets
Gaspre technical manager

To simplify your choice

JUNKERS condensing boilers

Condensing boilers use the energy released by the condensation of water vapor from gas combustion to raise the temperature of the heat carrier returning from the heating system. Thus, the “hidden” heat of the water vapor in the flue gases is used, resulting in an increase in the efficiency of the device of up to 15%. The best efficiency of this type of boiler is achieved at low heating water temperatures. To control the temperature of the water leaving the boiler, all devices have only a boiler thermostat as delivered. A suitable control unit must be added to control the outdoor air or room temperature.
Junkers condensing boilers are divided into four product families.

1. CerapurSmart – ZSB14-3C, ZSB22-3C, ZWB28-3C
Low-capacity condensing boilers equipped with a three-stage circulation pump and a Bosch Heatronic 3 control unit. The use of a suitable temperature controller allows the appliance to be controlled depending on the heat demand of different heat consumers. The equipment is supplied by the Junkers assembly plant in Turkey.
2. CerapurComfort – ZSBR16-3A, ZSBR28-3A, ZWBR35-3A, ZBR35-3A, ZBR42-3A
ZSBR and ZWBR condensing boilers are equipped with a self-regulating pump, an expansion tank and a Bosch Heatronic 3 control unit. ZBR units do not have an expansion tank and a circulation pump, so they must be added during installation in accordance with the heating section diagram. The use of different temperature controllers allows the boiler to be steered according to the needs of heat consumers. The equipment is supplied by Junkers’ German assembly plant.
3. CerasmartModul – ZBS22 / 120S-2MA, ZBS30 / 150S-2MA, ZBS30 / 170S-2 Solar MA
These condensing boilers have a built-in hot water thermos. This type of domestic water solution enables the same productivity to be achieved in a volume twice as small as a conventional heating coil tank. In addition, the boiler temperature is lower in the production of domestic water, which means a higher efficiency in the case of a condensing boiler. The ZBS30 / 170S-2 Solar MA model has a tank heating coil for connecting the solar circuit and automation for its control. The equipment is supplied by Junkers’ German assembly plant.
4. CerapurMaxx – ZBR65-1A, ZBR90-1A
High-capacity condensing boilers, which in case of cascade connection allows to increase the power of the boiler house up to 450 kW. According to the diagram of the heating part, a circulation pump, expansion tank, etc. must be added to the device. The choice of temperature controller also depends on the needs of the heating part. The boilers are supplied by Junkers’ Dutch assembly plant.

Explanation of type designation
Z – central heating (Zentralheizung)
W – the unit has a heat exchanger for the production of domestic hot water (Warmwasser)
S – switch in the device allows hot water to be produced in a boiler (Speicher)
B – condensing boiler (Brennwert)
R – automatic heating power regulation
14.22,28, … – the approximate power in kilowatts of the appliance
1, 2, 3 – product generation symbol
120/150/170 – volume of hot water thermos in liters
A – unit with closed combustion chamber (Aussenwand)

Simmo Paomets
Gaspre technical manager

To simplify your choice

JUNKERS heat pumps

Heat pumps began to be used around the world as early as the middle of the 20th century. However, it is only now that the price of energy has risen that we have begun to pay more attention to them. According to the Heat Pump Association, in 2007 about 5,000 heat pumps were installed in Estonia. Most of them, it is true, are air-to-air heat pumps that are used for cooling in the summer, as the number of larger, ground-to-water and air-to-water heat pumps increases. The Junkers 2008 catalog currently only contains geothermal heat pumps.

The “efficiency” of a heat pump is characterized by the coefficient of performance (COP) – the ratio of the energy supplied to the consumer to the electricity used, but it can be measured under different conditions. Most current manufacturers allow COP 5, as do Junkers. This result can only be achieved when testing the compressor, but the annual average can be considered as 3 for ground source heat pumps. As the compressor requires less work to obtain a lower outlet temperature, the best result is obtained when using underfloor heating. This also means that the heat output of the heat pump is lower at higher outlet temperatures.

Compared to other heat sources, it is very important for heat pumps to dimension them correctly. In order to prolong the life of the compressor, the capacity of the heat pump must be chosen so that it covers 70-80% of the actual maximum heat demand. Although additional heating is required, especially in cold weather, the heat pump compressor does not switch on and off frequently at daily, medium temperatures.

The advantages of ground source heat pumps are …
– low heating costs because? … ¾ energy comes from the earth’s crust, which is renewable energy
– the absence of a combustion process, thus a chimney and high temperatures
– independence from fuel supplies and prices.
– long-term maintenance-free operation

Junkers ground source heat pumps use a Mitsubishi scroll compressor with a COP of up to 5. The DHW temperature can be raised up to 65 ° C. Today’s Junkers nomenclature has two groups of ground source heat pumps – with and without a built-in hot water tank.
1. Pumps with hot water tank are TM60-1 – 5.5 … 5.9 kW, TM75-1 – 7.0 … 7.3 kW, TM90-1 – 8.4 … 9.1 kW, TM110-1 – 10.1 … 10.9 kW.
2. Pumps without hot water tank are TE60-1 –5.5 … 5.9 kW, TE75-1 – 7.0 … 7.3 kW, TE90-1 – 8.4 … 9.1 kW, TE110-1 – 10.1 … 10.9 kW, TE140-1 –14.0 … 14.4 kW, TE170-1 – 16.3 … 16.8 kW
3. Suitable domestic hot water tanks for the heat pump are SW290-1, SW370-1, SW450-1 .
The heating coil area of ​​these tanks is several times larger than conventional SO and SK boilers to ensure better heat transfer.

Simmo Paomets
Gaspre technical manager

A little explanation of our heat demand.

We are all heat consumers. Global warming has not yet reached the point where it is not necessary to heat in our latitudes in winter.
The prices of all energy carriers, especially liquid fuels, have risen both sharply and sharply over the last few years. The price of natural gas increased strongly in 2008 and although it decreased slightly in the spring of 2009, as of 1 September 2010, the price of a cubic meter of natural gas, including excise duty and Eesti Gaas network service, is 7.59 EEK. If we consider the efficiency of heating equipment to be 90%, we get an energy price of 0.88 EEK / kWh.
The price of liquefied natural gas has always been comparable to the price of electricity, and the price of electricity in Estonia continues to rise quietly but inevitably. On September 1, 2010, it was 1.17 … 1.61 EEK / kWh, depending on the package.
However, there are also cheaper options. A convenient way is to use a air-to-water heat pump with another heating source. This allows you to choose the type of heating depending on your and your house’s needs.
The graph presented here characterizes our heat demand. The horizontal axis has the outside temperature. The vertical axis on the right has days. The fine line graph shows the duration of the temperatures and we can see that we have the most +1? C days (about 21 days a year). The left vertical axis has the power required to heat the building. The line characterizes the power consumption of a house of about 150 m2 (12 kW at -21? C). The middle vertical axis is the product of these two: the energy that the house needs at different outdoor temperatures. The graph with a thick line shows that the greatest heat demand is in the range of -5 … + 5? C. The same curve applies to the money paid – the highest cost falls in this temperature range.

Air-to-water (including air-to-air) heat pumps still work calmly at -15 ° C, but their capacity at that time is about 60% of nominal. It follows that there is no point in choosing an air-to-water heat pump according to the peak load, but at low temperatures it must be assisted by additional heating. Gas consumers can use gas, as they would have to burn more than 750 m3 of gas a year to stay in an even lower price group. Any other hearth can be an additional source. The temperature at which the heating system requires assistance depends on the size of each specific house and the type of heating solution.
It is important that the heating system of the house satisfies the above-mentioned maximum consumption in the temperature range
(-5 … + 5? C) with low temperatures up to + 40? C. This is necessary because heat pumps achieve the best heat coefficient (COP) in a low-temperature heating system, such as underfloor heating. For the same reason, we do not try to produce domestic water with an air-to-water heat pump or, as discussed above, to heat in very cold weather if the heat pump’s capacity and COP fall.
Now let’s calculate a bit. Suppose that in a 150 m2 house, gas boilers can burn 3000 m3 of gas per year. It would cost 3000 x 7.59 = 22770 kroons. If half of this energy is taken from the outside air by means of a heat pump, then at COP = 3 you consume 4750 kWh of electricity from the energy required (14250 kWh). This would cost the most expensive tariff
(1.61 kroons) in case of 7647 kroons. With such a high electricity consumption, the electricity package would of course have to be redesigned, then the use of a heat pump would allow saving 3700 … 7000 kroons a year. Do what you want with it.
Therefore. By connecting an air-to-water heat pump to your existing heating system, you can choose between two types of energy and choose the cheapest one. By partially covering your heating needs with energy from an air-to-water heat pump, you save nature and money. By adding this option to gas heating, you save foreign gas and use the energy of the environment instead.

We offer you a low capacity air-to-water heat pump AMITIME, 3.8 kW or AMITIME 6.7 kW

In order to install it, you need to invite the project manager to evaluate the matter and …

  1. … make sure your heating system, or part of it, is low temperature, e.g. underfloor heating.
  2. … find a place on the outside of the heat pump. Preferably near the boiler room
  3. … find a place on the inside of the heat pump. If possible, 4 … 5 m from the outside and preferably in or near the boiler room.
  4. … secure the heat pump with electricity. One phase (AC 230 V) is required through the 16 A fuse.

Simmo Paomets
Gaspre technical manager

To simplify your choice

JUNKERS solar collectors

According to scientists, the sun has been shining for 5 billion years and will hopefully shine for another. Solar energy has made possible the development of life on Earth and stored fossil fuel energy in the earth’s crust, which is being depleted due to human activity. This, in turn, has given impetus to the development of solar panels, as this energy costs nothing. Developments are taking place both in the field of solar panels producing electricity and solar collectors providing thermal energy. The Junkers catalog contains solar thermal collectors that must be adapted to work with heating systems that produce main energy.

According to the literature, it is possible to get 300-450 kWh of heat energy per year with 1 m2 of solar collectors in Estonia, which is very unevenly distributed over the months. May-June-July 60 … 70 kWh, November-December-January 3 … 6 kWh. One sure thing, raising the temperature of 200 liters of water by 50 ° C always requires 11.6 kWh of energy. This shows that the need to store energy must be taken into account when using solar collectors, in order to prevent the system from shutting down due to boiling in the production of domestic water and to keep energy in the dark. By using solar collectors to produce domestic hot water, savings of 50-60% of the energy used for domestic water are likely. However, if you use a heat accumulator and accumulate the remaining energy for use in the heating system in spring and autumn, the savings will be 25-30% of the total energy consumption. Of course, the payback period of the system depends on the price of the main heating energy carrier. In the case of liquid-heated buildings, this is 10-15 years, the users of the ground source heat pump have to agree to 3 times longer.

The Junkers catalog contains 2 types of 4 different flat plate collectors from the FKT Top and FKC Comfort series. Each series has one model for vertical and one model for horizontal installation. The absorbent surface of all of them is 2.23 m2. FKC models have a slightly higher reflectivity, poorer efficiency, but also a lower price.
1. FKT-1S and FKC-1S – Vertical Manifolds.
2. FKT-1W and FKC-1W – Horizontally mounted manifolds.

In addition to the collectors, the catalog includes fasteners, a pump assembly, control automation and also the Tyfocor L heat carrier, which can withstand high and low temperatures. The solar heating system must have a domestic hot water tank with two heating coils, which can also be found in the catalog:
1. SK300-1 Solar
2. SK400-1 Solar
3. SK500-1 Solar

Gas heating condensing unit CerasmartModul ZBS 30 / 170-2 Solar allows the solar collector to be connected directly to the heating unit without the use of additional units, as they are built into the unit. In this case, the solar collector supports the production of domestic water.

Simmo Paomets
Gaspre technical manager