An indirect heating boiler is an aggregate for accumulating and heating a certain amount of water in a boiler house of a private house or in any other place. Its design includes a heat exchanger, as well as a coolant circulation system for hot water supply. For the operation of this heat exchanger, a heating system pipe can be used, as well as other possible sources.
Indirect heating boiler with recirculation - this is
- boiler operating principle
- Indirect heating boiler installation:
- device connection diagram Expansion tank for indirect heating boiler: how to choose the
- Steps for connecting an indirect heating boiler( video)
FGP boiler: operating principle of the
The indirect heating boiler is almost always operatedIt is common with a single-circuit boiler. In view of this, the unit takes up more space than a dual-circuit boiler. However, the use of the indirect heating method allows you to have hot water for home use all the time.
If hot water heated by a direct method is used by several cranes at once, then its pressure drops and the operation mode of the solid fuel boiler changes. When flowing from different spouts, the water temperature decreases simultaneously. If you use cold water in parallel from another tap, the amount of water flowing through the direct heat exchanger will decrease and the water temperature rises.
From the very name of the device it becomes clear that there is no direct heat generator in it. Heating of water occurs by heat exchange from a heated liquid. Hot water circulates through the coil, which is in the tank, or gets between the walls of the shell. With its help, the liquid is heated in the tank. Before installing an indirect heating boiler in your home, commensurate the principle of its operation and the need for it.
For this you need to know the following:
- The boiler is connected to several water intake points, providing stable water flow parameters;
- The liquid flow rate is limited only by the capacity of the unit;
- FGP boiler is suitable for permanent interruptions with hot water and electricity;
- After opening the faucet, the water is already hot, without prior draining.
If your boiler has an indirect heating, you need to take into account that the hot water in it will only be in the heating season. The disadvantage of this unit is also the fact that it takes considerable time to heat a large-capacity water tank.
Indirect heating cylinder wrapping with recirculation - this is
The piping of the boiler is a set of actions connected with the connection of the unit and ensuring the operability of the device at the proper level. This connection can be performed in accordance with various schemes. If necessary, you can additionally provide the system with recirculation, which will save water consumption.
Many of those who have a conventional boiler, know that the water from the spout is hot not immediately. It must first be drained, and then you can use it. But during this period a fairly large amount of water flows, which of course affects its costs.
Therefore, it is better to use the recirculation system when a looped line is obtained. In this case, hot water constantly flows and is heated, which means that it does not have time to cool down. Due to the instantaneous flow of hot water from the spout, the use of the boiler becomes more economical and efficient. However, to make such a system, you need to install an additional circulating pump. Some owners at the same time make the connection and the heated towel heater, which participates in this closed system. The scheme of tying with such hydraulics is a multi-circuit system. It includes the connection of a water heater, warm floors, heating and other. In this system, it is possible to use also distribution radiators, balancing fans and other suitable equipment.
The two-circuit and more devices are characterized by the following features:
- When installing the boiler, a special three-way valve must be installed into the DHW system;
- Two circulating circulation pumps are installed in the system: one of which relates to the circuit for the heating boiler, the other provides the hot water flow in the heating circuit system,
- Priority is given to the boiler circuit;
- Temperature control is carried out by a special thermostat or thermostat, which gives a signal when the temperature is lowered, after which the heating is switched on;
- When the thermostat trips, hot water enters the boiler;
- An additional switch must always be fitted to the boiler pump. It is used in the summer, when the general heating system is switched off.
This system is best suited when a house needs to connect not one boiler, but two. One of them can be completely directed to the maintenance of the heating system, and the second one can only be used to produce hot water.
Installation of an indirect heating boiler: connection diagram of the
The boiler connection solves the problem of correct operation of all device circuits. Several variants of the binding schemes are used for its installation. In this case, despite their difference, the supply of cold water to the indirect heating tank, and to the hot water pipe is the same.
The flow of cold water flows to the device from the bottom, and already the flow of hot water is supplied from the upper part of it. Heating in the tank takes place by supplying the coolant to the coil from above, and the liquid that gives its heat is taken from below. This connection of the device is guaranteed to ensure sufficient amount of hot water for use.
This scheme of water heating is very simple. The hot stream is directed to the consumer, and the cold liquid comes from below by the principle of the piston. When heated inside the coolant, the water moves to the top of the tank. In addition, an indirect heating boiler will give you many benefits.
- Has a large capacity;
- It is possible to install an outdoor or suspended structure;
- Can be vertical and horizontal;
- Differs by high values of temperature, power and heat exchanger;
- He needs a minimum time before heating the water to maximum;
In addition, this model has compact dimensions and will perfectly fit into the interior of your room.
Expansion tank for indirect heating boiler: how to choose the
design In order to correctly install an indirect heating boiler in your home, the most important thing is to determine its volume correctly. It depends on the estimated use of hot water, the number of people who will use this water supply and the type of premises.
To calculate the volume of the boiler you need, you need to know the principle of its operation and the intensity of the production of the tan inserted into the device. If you make a wrong calculation, the heating coil will not cope with the work, the efficiency will be small, and the unit will not be able to heat the water quantity assigned to it, or vice versa, the water in the device will be very hot.
Try to correctly calculate the amount of water consumed at a time. This will tell you how much liquid will go to your needs. Then multiply this indicator by the number of cases of using hot water per day. You will get the desired result.
Approximate water consumption for domestic use at a time can be represented as follows:
- Hand washing 3-4 liters;
- Shower intake - 30-50 liters;
- Sink in the bathroom - 10-15 liters;
- Bathing bath - 130-150 liters;
- Washing dishes - 16-25 liters.
To the result you obtained, be sure to add 15 - 20% of the volume received, in order that the boiler is not empty. When buying a FGP boiler, it is also important to choose the right material for the tank. The best option for this is a stainless steel tank. For performance, you can also use an enamel tank. It has high durability and low reactivity.
Steps for connecting an indirect heating boiler( video)
When a large family lives in an autonomous heating house, there is usually a problem with providing hot water. To avoid this and to be able to constantly enjoy the benefits, install indirect heating boilers. Today they are an excellent alternative for a single-circuit gas heating appliance.