Indirect heating boilers work by interacting with external heat carriers - for example, a heating boiler or solar panel. This allows users to receive hot water, saving electrical energy. One of the popular options for choosing from such models is the Drazice boiler. This company specializes in indirect devices, but also produces units of a combined type, capable of working according to the indicated scheme and heating water with electricity through the built-in heating element.
Pros and cons of Drazice boilers
In order to purchase a boiler of Dražice, you need to choose the most suitable version for a particular heating system. They differ in the principle of operation and the method of installation in the room: there are models designed for installation on the floor and for mounting on the wall.
The advantages of these devices are worth noting:
- the availability of the main options required at a budget price;
- choice of models: single and double-circuit, equipped with a heating element and without it, suspended and floor;
- lack of need for additional power sources;
- profitability - the use of an indirect apparatus will reduce the amount of utility bills;
- the possibility of separate use of two sources of heat carrier;
- option to combine two circuits;
- a tank that allows you to quickly provide heated water to the whole family, as well as have supplies;
- smoothness of switching;
- application of anode protection;
- simultaneous receipt of fluid from several points without temperature differences;
- accuracy of temperature indicator regulation (up to +80 degrees);
- very small heat loss;
- long term of operation subject to the recommendations of the instructions for a specific model (it is included in the set of attached documents)
As disadvantages, it is worth noting that indirect units without a heating element heat the water for a long time. Combined models when working with the built-in heater cope with this quickly. If the device is connected to the heating system, in the summer due to its shutdown, there will be problems with the coolant. In this case, you can connect it to the solar battery or, in the presence of a heating element, switch to power by electricity.
For efficient operation, the device should be located as close as possible to the source of coolant, and with large dimensions of the housing to organize this problematic. If the boiler is connected to the boiler, they must be installed next door in a specially designated room.
Specifications
When connecting the indirect Drazhitsa boiler to the boiler unit, the required temperature is created by the circulating coolant. The devices themselves have an enamelled steel case. Its function is to protect external and internal surfaces and seams from damage associated with high temperatures. The magnesium anode prevents the formation of scale deposits and also provides softness to the heated water. The outer parts of the body are also coated with a coloring compound. It is applied by hot drying. The same model can be produced in different colors.
The characteristics of a specific boiler are determined by its belonging to a particular line (they differ among themselves in the internal structure), as well as the volume. You can find models with a capacity of 80 to 200 liters of water. A coil-type heat exchanger is mounted in the tank (some devices have two).
The boiler is able to work in conjunction with boilers that use gas and solid fuel. Combining it with a solar heating system is also practiced.
Popular models
The names of the boilers carry certain information about their characteristics and design features. OKS - general marking of heaters of this company. Various letter designations are attributed to it. NTR is a simple single-circuit boiler with basic functionality, mounted on the floor. Additional letter R (NTRR) indicates the presence of a second circuit. Such a model can be connected to a solar system and a heat pump. The letters Z and V indicate installation on the wall: in the first case - with vertical placement, in the second - with longitudinal. The letter E indicates the presence of a heater. Also in the marking there is a two- or three-digit number - this is the volume of the tank in liters.
OKC NTR 200
The model of the boiler Drazice OKC 200 NTR is designed for installation on the floor. A capacious tank of 200 liters will allow residents to always have a large supply of water for hygiene and household needs. However, such dimensions require enough space to accommodate. Well, if for the boiler it turns out to allocate a separate room where it can be put next to the boiler. Models with the NTRR marking instead of the NTR are also on sale - they have two tubular heat exchangers, which makes it possible to connect to two coolants at the same time (for example, a boiler and solar system).
The height of the device is 140 cm, weight - 93 kg. The model is equipped with a safety valve and a thermostat with an external control unit. The maximum possible water temperature is 90 degrees. The boiler is connected to a single-phase voltage of 230 V at a frequency of 50 Hz. The device is able to heat the liquid from 10 to 60 degrees in 23 minutes. When working with two coolants, heating occurs about 1.5 times faster. The rated power of the device is 32 kilowatts. The tank is designed for a maximum pressure of 6 bar. Despite the presence of a 50% supply, it should not be kept in such a state for a long time.
OKC NTR 100
Like the previous model, this boiler is placed on the floor. In general, it has a similar device, but differs in size and power. The mass of the device is 53 kg, height - 90 cm. The tank holds 87 l of water. Boiler power - 24 kilowatts; in 13 minutes, it heats the water from 10 degrees to 60. Unlike the NTR 200 model, this unit is not produced in the version with two coils.
Other
For operation in conditions of frequent interruptions in the supply of coolant, it is advisable to purchase a model of a combined type. Some of them have a horizontal tank location and are designed for mounting on a wall in a longitudinal position. Like other lines, these boilers are available in different versions by capacity (maximum - 200 l). The temperature mode is supported by the built-in thermostatic device.
Indirect models are also available without a heater with a vertical tank, designed for wall mounting. They take up less space, convenient to connect in the immediate vicinity of the heat source.
Ways to connect a boiler
First you need to determine in which room the unit will be located. The best option is a specially equipped boiler room, but in practice the boiler is often installed in the bathroom, utility room or in the corridor. Cold liquid enters the nozzles of the device located below, and heated comes out of the upper ones. When you turn the lamb, the water goes to the faucet. Combined models also have the option of heating through an electric heater.
Floor
Installation of floor boilers Drazice involves placement on a level surface. Sometimes an elevation is made under the unit.The operation manual provides a wiring diagram suitable for the specific model of the unit, as well as recommendations for installing the water circuit. The latter can be connected with sharpening under hot water (then a valve with three strokes is set), or with a pair of pumps that regulate the fluid flow, focusing on the required temperature.
During installation, it is forbidden to place shutoff valves between the boiler itself and the safety valve. Although the use of fittings through which air is discharged prevents incidents of impacts by water flows of system elements, it can be implemented only in those models for which it is permitted by the manufacturer (the corresponding instructions are in the instructions), and in no case should it be placed in the designated interval. The pressure at which the safety valve is activated must be set identical to the maximum permitted value for the boiler. It should also be at least 1.2 times higher than the highest value for water supply, otherwise a pressure reducing valve is introduced into the installation.
Mounted
Suspended models are supposed to be attached by means of anchor parts and brackets. After studying the installation recommendations in the instructions, you can determine the required number of elements of different types. Wall-mounted models are advantageous in that they are most likely to be located higher above the floor surface than the boiler - this position helps to accelerate the heating of water. The mounting location is selected according to the type of tank (horizontal or vertical).
Boiler operation manual
In the process of using the boiler, a number of safety requirements must be observed. Before filling it with water for the first time, it is necessary to tighten the nuts of the flange connection of the container. In no case should you stop using the thermal fuse, as well as carry out any operations with the thermostat (except for adjusting the temperature by means of a switch). You also need to monitor the condition of the magnesium anode. When a need arises, it is replaced. All exit points of the heated liquid are supplied with mixers.
Installing an indirect boiler will allow you to optimize energy costs and always have on hand a supply of hot water for various household purposes. When purchasing a device, you need to carefully study the requirements for connection and installation.
