If in conventional storage water heaters the water temperature rises due to the operation of heating elements, then in boilers heating is carried out during circulation in the coolant system. That is, the liquid is heated in the boiler and fed through pipes to a coil or other heat exchanger installed in the tank. At the same time, cold water enters the tank from the central line, which is subsequently heated due to heat transfer through the walls of the coil. Such a system will allow you to forget about the problems with the lack of hot water forever.
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1. Thermex Combi Inox IRP 150 V (37 650 руб.)
The Thermex Combi Inox series of boilers (in addition to this unit with a volume of 150 liters, but also models with a 200 and 280 liter tank) attracts the attention of buyers for several reasons. First of all, this is a combined heating method – the ability to work from an indirect heat exchanger (power 24 kW) and from a heating element (maximum electric power 6 kW). The inner tank and coil are made of stainless steel.
This model has a familiar cylindrical shape and a white case. Mounted on the floor, without the possibility of wall mounting. The water connection is on the side.
The maximum allowable working pressure is up to 7 atmospheres. It is also worth noting that the type of control for this device is mechanical, unlike many competitors. It differs from electronics in simplicity and reliability.
2. Drazice OKC 125 NTR (23 rubles)
Reliable and unpretentious, this representative of the Czech manufacturer is able to solve your problems with the lack of hot water, which, unfortunately, often occur in many cities. The tank capacity is 113 liters, which is more than enough for a family of 2-3 people.
This water heater is directly connected to the heating boiler circuit. And thanks to a special system of pipes through which the coolant circulates, it is possible to heat water to a temperature of 80 degrees in just 17 minutes.
3. Protherm FE 200/6 BM (38 rubles)
This spacious model with a 184 liter tank is compatible with many types of boilers. The titanium anode will reduce the formation of corrosive spots and scale inside the tank, and the lower location of the tubular heat exchanger will ensure rapid heating of the water. A capacious tank will provide hot water for a family of 4-5 people.
An additional protection system will eliminate the consequences of overheating, and a thermal insulation system using a polyurethane “fur coat” will keep the water warm for quite a long time.
4. Baxi Premier Plus-150 (41 rubles)
Despite the rather high cost, this device is one of the recognized leaders in the market. To a greater extent, this status was obtained due to the quality and reliability of components and assembly, which are guaranteed by the manufacturer.
The internal tank with a volume of 150 liters is made of stainless steel. An additional heat-insulating layer is made of foamed polyurethane, which allows you to minimize heat loss. And to ensure fast and smooth heating, the device has a coil-in-coil technology.
Also of the pluses can be noted the possibility of both wall and floor installation.
5. Gorenje GBK 150 ORLNB6 (22 rubles)
This device will delight you with its high efficiency and excellent quality, which are guaranteed by the popular Slovenian brand. In addition, the device stands out for its wide functionality.
Thus, two “dry” electric heaters of 1000 W each are used as additional sources of heating in the equipment. A large magnesium anode will help to cope with corrosion.
It is worth saying that the system is equipped with frost protection, so that the boiler can be installed even in an unheated room. At the same time, the heater is equipped with an electronic control system, thanks to which it is quite quick and convenient to set up.
The main advantage of this model is the innovative antibacterial system. In the absence of heating over 65 degrees for 120 minutes, the device will independently heat up the water to reduce the number of microorganisms in it.
6. Gorenje GBK-80 ORRNB6 (19 rubles)
Due to the tank volume of 80 liters, which is less than most analogues, the device is very compact. The capacity of the tank is enough to provide warm water to a small family of 2-3 people. At the same time, the device has two points of water intake, so it can be used simultaneously for the kitchen and for the bathroom.
The electronic control system will allow you to precisely set the required temperature to which the heating will go. In total, the temperature range is from 20 to 75 degrees. For an additional heating system, the design of the equipment provides for two heating elements of a “dry” location.
It is also worth noting that this model is very safe and is protected from corrosion, overheating and switching on without water. In addition, there is a reliable system of antibacterial protection and antifreeze, which allows you to install equipment in an unheated room, for example, in the country.
7. Hajdu AQ IND150FC (20 руб.)
This water heater is in demand among buyers due to its affordable price and fairly wide functionality. The device is equipped with several points of water intake. In addition, it is possible to install an electric heater with a power of 2 or 3 kW.
From the inside, the tank is covered with glass enamel, which permanently protects the steel from corrosion. The heat exchanger itself is made of ordinary steel with protective enamel. At the same time, thermal insulation made of polyurethane foam and a polymer paint layer on the outer surface allows the water to remain hot for a long time. Among the shortcomings, it can be noted that the device has a heating limit of up to 65 degrees and a small heat exchanger area – 0,81 sq.m.
How to choose an indirect heating boiler
What to look for when buying the best indirect heating boiler?
Power
As a rule, indirect heating boilers have a fairly capacious tank, which makes it possible to provide residents with a large amount of hot water. For example, for a family of 3-4 people, a device with a volume of 100 – 125 liters is enough.
In addition, do not forget that the rate of heating water depends on the power. The more powerful the machine, the longer it takes to heat up.
Management
Models with a mechanical type of control are simpler and more reliable in use, while devices with an electronic system allow you to adjust the device to the nearest degree. So you can rationally use the power of the heater, depending on your needs. As a rule, “electronic” models will be slightly more expensive.
Dimensions
It should be understood that indirect heating boilers have very large dimensions, like other storage-type water heaters. If you opted for the purchase of such equipment, then you need to decide in advance where the device will be installed.
It will not be superfluous to make sure that the selected model according to the type of installation will suit your room. For example, some boilers are universal and are installed both on the floor and on the wall. Others have only one mount.
Economy
Boilers allow you to save on heating water, because its temperature rises due to the central heating system. True, it must be remembered that the larger the tank volume of the selected device, the more energy will be required.
Additional features
When buying an indirect heating boiler, it will not be superfluous to clarify how the device is equipped with various security systems. If almost all models have protection against overheating or switching on without water, then some devices have a very convenient anti-freeze system. This makes it possible to use the equipment in the country, when the house is empty in winter, you can not worry about the device.
In addition, a rather pleasant addition will be the ability to install an additional heating element – this will allow you to use the device when the boiler is turned off.
Checklist when buying the best indirect heating boiler
1. Pay attention to the presence of an additional heating element – this will allow you to use the water heater even in case of force majeure with a heating boiler.
2. Boilers of indirect heating have floor and wall mounting types, some are combined. When choosing a location for the appliance, make sure that your model can be installed correctly.
3. Some water heaters are suitable for certain types of heating boilers. Be careful when buying so that the selected model fits your equipment.