The climatic conditions of the middle strip and the north of Eurasia require thermal insulation of houses, however, warming alone is not enough. Heat loss must be compensated for with a heating system. Water heating in a private house is a common and most effective way.
The quality of the heating circuit depends on the design features, the choice of heating device and the type of wiring. You will learn how to determine the equipment and the most suitable circuit by reading the article we have proposed. The information provided is based on the requirements of building codes.
We described in detail the principle of the device for a water heating system, and examined typical device options. To optimize the perception of a difficult topic, they applied schemes, photo selections and videos.
Structure and principle of operation
Heating structures with a liquid coolant have a similar set of constituent parts, these are:
- heating equipment - boiler (gas, liquid or solid fuel), stove, fireplace.
- Closed loop in the form of a pipelineproviding continuous circulation of the heated and cooled heat carrier (antifreeze).
- Heating appliances - metal finned, panel or smooth-tube radiators, convectors, pipelines for water floor heating.
- Stop valvesrequired to disconnect individual devices or system lines for repair and maintenance;
- devices for adjusting and monitoring the operation of the system (expansion tank, pressure gauge, relief valves, etc.).
- Circulation pumpsused to create a forced supply of coolant, sometimes to ensure a stable pressure in the system, a booster pump is installed.
If a centralized gas pipeline is nearby, the most economical solution is to install a gas boiler.
In the absence of central networks, an independent gas supply system will have to be installed. However, this option is applicable only in the case of arranging a manor of a sufficiently large area.
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Gas boiler with water heater
Condensing gas boiler
Wall mounted gas heating unit
Solid fuel boiler in home heating
Fragment of a heating system
Liquid fuel boilers
Electric equipment in autonomous heating
In cottages built on small plots in non-gasified areas, an autonomous operation of gas heating equipment will provide an ordinary cylinder. As an alternative, you can use liquid or solid fuel stoves, and only in extreme cases - expensive electrical devices.
The preference for water heating in country houses is given due to the simple principle of operation. Heated in the boiler to a certain temperature, water under pressure is supplied to the pipes leading to radiators or convectors.
An autonomous heating system is designed for independent production of thermal energy, transferring it to the consumer through heating devices, collecting and transporting cooled liquid back to the boiler
According to the type of coolant movement along the heating circuits, they are divided into:
- Natural (gravitational). The circulation of the coolant in them is stimulated by natural phenomena, according to which the heated water rushes up, and after the heat is transferred to the radiators and cooled, it returns down. There she again enters the boiler to resume cyclic movement.
- Artificial (they are also pumping or forced). The circulation pump is responsible for the circulation of the coolant in the forced circuits, which on one side of the circuit pumps the hot coolant, and on the other sucks in the chilled water.
Gravity scheme is the simplest and most affordable option for independent implementation. It consists of a minimum of equipment. These are return and supply lines, a boiler, an open expansion tank, radiators. Because the movement of the coolant does not require pump stimulation, the systems are absolutely non-volatile.
The simplest water heating system with natural coolant movement includes a minimum of equipment: boiler, piping, batteries and shutoff valves
The advantages of natural heating include minor construction costs compared to the pump counterpart. They do not need to be equipped with sophisticated technical devices that are not cheap. There are no electricity costs during operation.
The weighty minus of gravity systems is the extremely limited range. They can work at full strength with a horizontal length of up to 30 m. Such heating for a long time “accelerates” after a downtime. There is a risk of freezing of the coolant in an open tank during the frosty period.
Water heating with pump circulation is more difficult technically and technologically. For its construction, control and adjustment devices for the circuit (+) are required
Forced circulation is good because it freely handles multi-storey buildings with an extensive and extensive heating network. The scheme is more effective than the previous type, but more expensive and more complicated in construction. Before its construction, it is necessary to make competent calculations and develop a project.
Artificial circulation heating is equipped not only with pumps, but also with all kinds of technical devices for regulating heat transfer and monitoring the operation of the system. Among them are automatic and mechanical air ducts, temperature regulators, pressure gauges, safety valves for dumping excess coolant into the sewer, etc.
A variant of a combined heating system: in addition to a boiler or a brick furnace that performs the main function of heating the coolant, a solar collector mounted on the roof and working effectively in sunny weather is connected
Compulsory heating equipment must be selected based on calculations. For example, for the movement of the heat carrier along each 10 m of the heating circuit, 0.6 m of pressure created by the pump is necessary. In order to choose the necessary device, you need to know exactly the length of the pipeline and the hydraulic resistance in all areas.
It often happens that for equipping artificial water heating of a country house, one pump is insufficient. Then an additional circulation analogue or booster pump is installed.
The main disadvantage of forced heating is dependent on continuous supply of electricity. In case of interruptions, it is recommended to stock up with a generator, which also does not differ in low price.
Water heating systems, built for two / three-story country houses, are arranged on the principle of primary-secondary rings. Within the first floor, a primary ring is constructed, covering the boiler and boiler. Secondary rings with radiators and underfloor heating are connected to the primary ring
Standards and requirements for autonomous heating
Before designing a heating structure, you need to look at SNiP 2.04.05-91, which sets out the basic requirements for pipes, heating devices and valves.
General norms are reduced to ensure that the house has a comfortable microclimate for the people living in it, to properly equip the heating system, having previously compiled and approved the project.
Many requirements are formulated in the form of recommendations in SNiP 31-02, which governs the rules for the construction of single-family houses and providing them with communications.
Separately stipulate provisions related to temperature:
- coolant parameters in pipes should not exceed + 90ºС;
- optimal indicators are within + 60-80ºС;
- the temperature of the outer surface of the heating appliances located in the direct access zone should not exceed 70ºС.
Heating system pipelines are recommended to be made of brass, copper, steel pipes. In the private sector, polymer and metal-plastic pipe products approved for use in construction are mainly used.
Pipelines of water heating circuits are most often laid in an open way. Concealed installation is allowed with the installation of “underfloor heating”
The method of laying a heating pipeline can be:
- Open. It involves laying on building structures with fastening with clips and clamps. Allowed with the device circuits of metal pipes. The use of polymer analogues is permitted if their damage from thermal or mechanical stress is excluded.
- Hidden. It involves laying pipelines in gates or channels selected in building structures, in skirting boards or behind protective and decorative screens. The montage of the circuit is allowed in buildings designed for a minimum of 20 years of operation and with a pipe service life of at least 40 years.
The priority is an open installation method, because the design of the pipeline route should provide free access to any element of the system for repair or replacement.
Pipes are hidden in rare cases, only when such a decision is dictated by technological, hygienic or structural necessity, for example, when installing “warm floors” in a concrete screed.
When laying the pipeline systems with a natural movement of the coolant, it is necessary to observe a slope of 0.002 - 0.003. Pipelines of pumping systems, inside which the coolant moves at a speed of at least 0.25 m / s, do not need to provide slopes
When the highway is openly laid, the sections crossing the unheated rooms must be provided with thermal insulation corresponding to the climatic data of the construction region.
Autonomous heating pipelines with a natural type of circulation must be installed in the direction of movement of the coolant so that the heated water reaches the batteries by gravity, and after cooling it moves along the return line to the boiler in the same way. Highways of pumping systems are built without a slope, because it is not necessary.
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The specifics of an open heating circuit
Pros and Cons of Open Systems
Closed circuit heating system
Closed system technical equipment
The use of various types of expansion tanks is discussed:
- open, used for systems with both pumping and natural coercion, should be installed above the main riser;
- closed membrane devices used exclusively in forced systems are installed on the return line in front of the boiler.
Expansion tanks are designed to compensate for the thermal expansion of the liquid during heating. They are needed to dump surpluses into the sewers or corny into the street, as is the case with the simplest open options. Closed capsules are more practical, because they do not require human involvement in regulating the pressure of the system, but more expensive.
An open expansion tank is installed at the highest point in the system. In addition to providing a reserve for expanding the liquid, it also has the task of air removal. Closed tanks are placed in front of the boiler, air vents and separators are used to remove air
When choosing stop valves, ball valves are preferred, when choosing a pump installation, equipment with a pressure of up to 30 kPa and a capacity of up to 3.0 m3 / h is preferred.
Budget opening varieties must be periodically replenished due to standard weathering of the fluid. Under their installation, it is necessary to significantly strengthen the attic floor and insulate the attic.
It is recommended that radiators and convectors be mounted under windows in convenient places for maintenance. The role of heating elements in bathrooms or bathrooms can be played by heated towel rails connected to heating utilities
Types of water heating systems
The type of heating system is determined by a combination of several factors. Among them, the circulation of the coolant, the method of assembly of the system, the lower or upper version of the laying of the supply pipe, etc.
Regardless of the type of heating device, whether it is a traditional radiator, a plinth convector or a “underfloor heating coil”, heated water reaches them, and after cooling leaves the standard way for all systems.
Two-pipe and one-pipe designs
The final object of heat transfer are devices located in all heated areas of the house. In many respects, the heating efficiency depends on the installation scheme of the pipeline, so we will dwell on one- and two-pipe wiring in more detail.
The most common is a classification consisting of two points:
- Single tube version - serial connection of radiators. The bottom line is that the coolant entering the system sequentially flows from one device to another. On approaches to distant points, he manages to cool significantly.
- Two-pipe version - a system with parallel connection of the supply and return pipes. Its principle is based on the fact that the feed is carried out to all devices almost simultaneously. The cooled water does not flow into the next device, but is collected by the return line and transferred to the boiler.
Monotube schemes are available with both natural and forced water movement. Within their class are divided into two varieties: flowing and with bypass.
In flowing circuits, the coolant, upon reaching the extreme radiator, manages to cool down very much, therefore, in far rooms it is recommended to install devices with an increased number of sections.
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Single tube type specifics
Pros and Cons of a Single Pipe Scheme
The principle of a two-pipe heating circuit
Pros and cons of a two-pipe system
The introduction of a bypass into the system allows you to partially redirect the hot fluid to the following devices, so almost all batteries receive and give off almost equal amounts of heat. The movement of heated water is controlled either by two valves installed on the bypass and the supply pipe, or by one three-way valve.
The main difference between two-pipe structures is the use of two branches: feed and return. The first serves to supply hot coolant to the radiators, the second - to divert water back to the boiler.
One-pipe assembly involves rapid cooling of the coolant, therefore it is recommended to install this type of wiring in country cottages with a small area or in country houses (+)
The two-pipe wiring diagram is used in systems with both types of coolant movement. According to the number of processed contours, it is single- and double-circuit.
In the first case, the boiler is installed at the beginning of the pipeline, and the pipes are routed to the left and to the right of the unit around the perimeter of the heated object. In the second case, the boiler is installed in the center, and the heating circuits are positioned so that their rings are on both sides of the unit.
The 2-pipe system is more functional and reliable, it allows you to evenly distribute heat throughout all rooms. Thanks to additional taps and adjustment devices, it is possible to control the heat supply to each individual radiator. If one element fails, the performance of the remaining devices will not be affected.
The device of the two-pipe system will provide almost simultaneous supply of heated water to the devices. The outflow of cooled coolant is carried out through the return pipe (+)
Variations on connecting pipes and devices
All of the listed types of water heating for arranging a country cottage are divided into subspecies:
- By the location of the riserscombining heating appliances. They are divided into horizontal and vertical. It is clear that the former are used in single-story buildings, the latter in multi-story buildings. In single-tube systems with natural movement, there are only feed risers.
- By the location of the supply and return pipes. There are upper or lower wiring. The first provide for laying the feed at the highest points of the system, so that the coolant flows into the devices from above. According to the second situation, the return flow is laid below the radiators.
Gravity systems with a lower wiring are rarely used because of the difficulties with air exhaust in distant instruments. The lower wiring is better combined with pump circulation, each device of which is still equipped with an air vent.
Vertical heating systems are constructed with upper and lower wiring. According to the scheme, it is clear that they are used to equip houses with two or more floors.
Heating with top wiring is arranged in cottages without basements, but with an attic. Occasionally, in the absence of an attic, the supply is laid along the interface line between the ceiling and walls, which negatively affects the interior picture. The lower layout is suitable for houses with a flat roof without roofs, but with a basement.
In systems with horizontal wiring there is no at all or the minimum number of vertical risers
Pipeline assembly method
Classification by the method of pipeline construction divides heating systems into tee, collector and combined.
Tee schemes can be safely attributed to the classics of the genre. They involve assembling pipelines and connecting devices to them using tees used in nodes connecting pipes to risers, radiators to pipes, etc. Fundamentally, this is a sequential circuit.
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Perimeter version of the structure
Collector type heating assembly
Combined version of the device
Collector or otherwise beam design increases the possibility of water heating of the cottage. This is a kind of modified system with individual branches (rays) of the pipeline extended to each device and with a distribution element in the center.
Distribution unit - the collector is equipped with many taps, so that you can control the heat transfer of each device individually, turn it off for repair. If desired and financial capabilities, each branch can be equipped with its own pumping device.
The main advantage of the collector is the ability to control and adjust heating processes in separate rooms of the entire building from one “control point”
Collector wiring suit mainly for horizontal circuits with a lower gasket of the supply pipe. When installing in 2- and 3-story houses, it is recommended to install a distribution manifold on each floor - this way you can adjust the air temperature in any corner of the building.
The adjustment unit for cottages on several floors consists of two interconnected nodes: a feed collector and an analog for return. The first is responsible for the delivery of hot coolant to the devices, the second stimulates the removal of cooled liquid.
To the collector - switchgear, you can connect not only the radiator design, but also the "warm floor", hot water supply, as well as the baseboard (panel) system (+)
Collector wiring is arranged on the basis of one- and two-pipe heating systems, used in combination with a perimeter (tee).
Features of baseboard heating
Radiators or batteries in the traditional sense are not the only heating devices to create a comfortable microclimate in individual rooms. Not so long ago, “warm skirting boards” appeared - heating elements resembling the same building analogues in their shape and location.
The design of the skirting heater is simple: inside there are elements resembling radiators with copper tubes, on the outside there is a solid deaf box made of metal that gives off heat well
The principle of operation of the device, located around the perimeter, helps to maintain the set temperature constantly. First, the tubes are heated inside the case, then - the box, warm air rises from it, increasing the temperature of the walls.
Thus, the air in the room is heated directly from the baseboards and from all the walls along which they are located.
A rational step is to use warm skirting boards in places that directly border cold air from the street: on terraces, verandas and balconies
Advantages of baseboard heating:
- creating a comfortable microclimate that excludes active air circulation;
- the possibility of warming risk zones at the joints of the floor and walls, where mold often appears;
- simple installation, which can be performed without the involvement of specialists;
- choice of modules by type (single and double row) and power (for example, 310 W and 510 W);
- diverse design that does not require camouflage;
- affordable price.
The disadvantages include special arrangement conditions: furniture items cannot be placed along horizontal elements, as this will harm the heat transfer process. Each circuit included in the system should not be longer than 15 meters, so for a large room installation of 2 or 3 circuits is required (as an option - combined heating).
For skirting boards, the same coolant is used as for radiators - water or antifreeze in an amount of about 330-350 g / m. Normal temperature - from + 45ºС to + 80ºС, in some versions heating up to + 110ºС is allowed
In addition to water skirting boards, electric ones are used, but their maintenance for a private house is too expensive.
The equipment of the "Warm floor" system
An effective and inexpensive design, called a warm floor, producing heating of the room from the floor, has long established itself only on the best side. It is actively used in urban apartments to create a comfortable atmosphere in bathrooms, bathrooms, in bedrooms, in kitchens and loggias.
Underfloor heating device diagram: a small-diameter flexible tube through which heated coolant circulates is part of an adjustable heating system
The pipeline must have high thermal conductivity, strength, elasticity, minimum resistance, therefore, metal plastic or sewn polyethylene is used for its manufacture. A protective and stabilizing coating is a cement screed.
Advantages of underfloor heating:
- effectiveness with any type of flooring (laminate, linoleum, carpet, ceramic tile);
- noticeable heat savings - from 30% to 50%;
- inexpensive cost and installation;
- DIY installation
- use in combined heating systems (along with radiators and convectors).
Autonomous water heating does not depend on the supply of electrical energy, as it is powered by a gas (or other) boiler.
Option of a combined heating system (underfloor heating + panel radiators) with an expanded temperature control and adjustment system using sensors and thermostats
The disadvantages of water heated floors include the imperfection of regulation and the inability to install in the city with central heating, but this does not apply to local suburban systems. In case of violation of the installation rules, an emergency and flooding is possible, therefore, you should carefully consider both the choice of equipment and installation.
Read more about the coolant and its properties
There is no perfect fluid for any heating system. Each of the options presented on the heat transfer market has specific characteristics, for example, a range of operating temperatures.
If you violate the boundaries of the specified range, the heating system will simply “stand up”, and with a worse outcome, pipes will burst and expensive equipment will fail.
In addition to temperature parameters, the fluid for the pipeline has properties such as viscosity, anticorrosion, and the ability to release toxic substances. An analysis of the necessary qualities showed that the best liquid coolants are purified water and a special chemical solution - antifreeze.
The table shows the main advantage of antifreeze based on ethylene glycol - the maximum freezing point is -40ºС, while water turns into ice even at 0ºС
Antifreeze pouring is necessary in homes that are not a permanent residence. Usually leaving the building in the cold season, the owners drain the water to avoid an accident and equipment breakdown. The antifreeze does not need to be removed - upon returning, you can immediately turn on the boiler without fear of leakage or rupture.
At extreme temperatures, the chemical coolant, having changed its structure, retains its previous dimensions. Simply put, it turns into a gel that retains its properties without change. When the temperature reaches a comfortable mark, the gel-like structure again becomes liquid, completely retaining its original volume.
Some more useful information about antifreeze:
- serves at least 5 years, one filling is able to withstand 10 heating seasons;
- the fluidity is 2 times higher than that of water, therefore, it is required to monitor the tightness of the joints;
- increased viscosity requires insertion of a more powerful circulation pump;
- the expansion ability during heating entails the installation of a volumetric expansion tank.
And you must always remember that a chemical solution is toxic and dangerous to human health.
Antifreeze for pouring into home heating systems is sold in plastic cans from 10 l to 60 l. The average cost is from 750 to 1100 rubles. for 10 l
Despite the outstanding characteristics of antifreeze, water as a coolant is more popular. It has the highest possible heat capacity, which is approximately 1 kcal. This means that a coolant heated to 75 ° C when cooling in a radiator to 60 ° C will give the room about 15 kcal of heat.
Water is available. If you equip the water supply system with reliable filters, you can use the free option - water from your own well. It does not contain hazardous chemicals and will not cause poisoning in an accident.
The negative side of water is the content of some mineral salts that cause corrosion. The problem is solved by simple boiling or using rain (or melt) instead of well water.
There are complex systems for purifying and preparing water for a private house: in addition to universal purification, water goes through several stages to become potable or suitable for pouring into the heating circuit (+)
Water is not recommended for use in homes for periodic residence.
Pipe selection for routing
The final result depends on the quality of each system part, which consists in preserving and saving heat, therefore, the most extended elements - pipes - must also be given some attention.
From a technological point of view, pipes and fittings should have the following qualities:
- strength;
- ease;
- suitability for repair;
- tightness;
- low noise.
Low cost is also an important component when choosing, because a large number of products for various purposes are required for heating system equipment.
Polypropylene pipes are the best option for self-assembly of the heating system. You can learn how to use a soldering apparatus for stitching pipes in 10 minutes
Now hardly anyone will undertake the installation of wiring from metal pipes. Steel, copper and galvanized products are a thing of the past, giving way to cheaper and more functional counterparts.
The best alternative is polymer products. which can be divided into three groups:
- polypropylene;
- metal-plastic.
Advantages of polypropylene pipes - low cost, ease of welding, long service life. Minus - lack of elasticity. When replacing the pipe, you will have to change the whole fragment from connection to connection.
On a long section of the trunk, polypropylene pipes sag, as they have an extension of 6 mm / 5 m. Strong fixation is provided with brackets or clips mounted on the wall at intervals of 1-1.1 m
Durable metal-plastic pipes are resistant to sudden changes in temperature. Able to serve without major repairs up to 30 years. The weak point is the connecting elements - fittings with an unreasonably narrowed bore. If the coolant freezes, a breakthrough is likely.
When choosing pipes, focus on the main technical parameters of the equipment and the type of coolant.
Interesting videos provide useful information about schemes, components, installation of liquid heating systems, as well as personal experience in installation.
Video # 1. Features of a one-pipe heating system:
Video # 2. An overview of the schemes of a two-pipe heating system:
Video # 3. The practical application of the radiation scheme:
Video # 4. Detailed installation instructions for the heating system:
Advice to anyone who wants to independently equip a complex heating system in a country house: when designing a project, be sure to consult a specialist so that after installation you do not encounter unforeseen circumstances. Plumbers will help you choose reliable equipment, tell you a more efficient wiring diagram, make accurate calculations, and the result will be comfort and warmth in the house.
Do you have any questions about our proposed information? Do you want to share useful information or your own experience in the design of the heating circuit? Please write comments in the block below.