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Combined heating system - the choice and price of a mixed system

Combined heating system
Different implementations
Easy system control
Integration into any interior
Comfortable temperature all year round

A combined heating system for a private house is implemented using several types of equipment. This approach is the most rational in the case when the main source of heat is not enough for house heating.

The cost of installing a heating system depends on many factors:

  1. selected heat source (electric, gas, solid fuel boiler or heat pump) and its manufacturer;
  2. the required area of ​​underfloor heating or the presence of warm walls;
  3. number of heating devices, such as radiators, fan coil units and in-floor convectors:
  4. residential heating area, etc.

It is impossible to determine the exact cost of the heating system. Therefore, Alter Air specialists will be able to make a competent project, select all heating devices, and, accordingly, make a commercial offer. Thereafter, the installers will be able to qualitatively install the heating system, adhering to the project.

Interior boiler Vertical radiator in the interior
Conditions for combined heating

Conditions for combined heating

To create a high-quality and efficient combined heating system for a private house, certain conditions must be observed:

  • the design of the building in all respects must meet the criteria for an energy-efficient home (availability of high-quality double-glazed windows, heat-insulating materials for walls and roofs);
  • installation of a ventilation system with heat recovery;
  • hydraulic system for low-temperature mode, which requires 100% underfloor heating surface (water or electric).
Recommended equipment
Heat pumps
Heat pumps

Air-air, air-water, water-water, ground-water

Heating boilers
Heating boilers

Condensation, electrical and gas

In-line convectors
In-line convectors

Electrical and water

Fan coils
Fan coils

Wall, ducted, floor

Heated floor
Heated floor

Water, electric

Convector heaters
Convector heaters

Intrafloor and wall/floor

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Heat source combination options

Heat source combination options

A combined home heating system is a combination of two or more heat sources to heat a home in winter.

The following combinations can be used for such a system:

  1. Heat pump and gas boiler.
  2. Heat pump and electric boiler.
  3. Solid fuel boiler and electric boiler.
  4. Solid fuel boiler and gas boiler.

Each type of heat source has its advantages and disadvantages. Therefore, we will consider options for a mixed heating system and equipment options.​

Heat pump and gas/electric boiler
Heat pump and gas/electric boiler

Gas and solid fuel boiler
Gas and solid fuel boiler

Electric and solid fuel boiler
Electric and solid fuel boiler

Gas, electricity and solid fuels
Gas, electricity and solid fuels

Hybrid heating system with solar collectors
Hybrid heating system with solar collectors

Special conditions of cooperation

We are happy to jointly conduct projects with organizations and self-employed specialists, recommend you to our clients and help with the outsourced engineering part. Additionally, we invite you to attend seminars of the "Engineering in Design" series, where we show by examples how to correctly implement engineering systems in the interiors of end customers.

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For interior designers
For architects
For foremen
For dealers

Heating devices combination

Combined home heating involves the use of various heat distributors:

  1. convectors;
  2. radiators;
  3. underfloor heating and warm walls.
In-line convector in the interior In-line convector: structure
In-line convector

Convectors

For combined heating, only in-floor convectors are used.

The principle of operation of the convector is natural and forced convection. This implies a constant circulation of warm and cold air masses in the room, as the warm air cools, becomes heavier and goes down.

The selection of the convector depends on the thermotechnical calculation. Since the wrong size of the device will lead to poor-quality heating of the room.

An important part when choosing a convector is its installation method. The installation of the unit takes place only under the window, since it is there that the largest amount of cold passes in winter.

Underfloor heating and warm walls + additional heat sources

Underfloor heating is the main element in the implementation of the heating system. Since underfloor heating is a low-temperature element of the heating system, it is necessary to comply with special requirements for the supply temperature of the heat carrier. The temperature of the floor surface should be in the range of + 24-26 °C, since an increase in floor temperature can lead to a decrease in human comfort.

When the floor temperature rises, the following problems may occur:

  1. high temperature of the floor surface, which will create discomfort for the foot;
  2. with constant temperature fluctuations, the floor will not be able to cool down quickly because the concrete tends to heat up slowly and cool down for a long time.

Based on this, to prevent these problems and create an optimal microclimate at any time of the year, it is necessary to install additional heat sources, such as:

  1. fan coil units - devices that can provide a comfortable and uniform supply of warm or cooled air, regardless of the season;
  2. radiators - used only for space heating;
  3. in-floor convectors - devices that provide heat, but with the installation of Kampmann HK – you can also get housing cooling in the summer.

For the efficient operation of the heating system, a prerequisite is the availability of pumping groups that can carry out the supply of a higher temperature to convectors and radiators, and lower for a warm floor to prevent overheating of the floor surface.


Warm walls can also be used in the implementation of the heating system. It should be noted that the installation of warm walls should be carried out in the range of 1.5 meters from the floor level. When installing the system, it is forbidden to hang any equipment and place furniture where the pipelines for the warm wall system are laid.

Equipment for mixed heating system

Components of the system

​The combined heating system includes various heat sources and heating devices that are used to implement the system.

Heat pump

Heat pump is considered the most efficient and cost-effective equipment that can perform three functions: space heating / cooling and hot water heating at any time of the year. Therefore, a heat pump with underfloor heating and additional devices such as fan coil units, radiators, in-floor convectors will provide residents with an optimal microclimate in a house or apartment, and will also reduce the cost of maintaining a house.

The heat pump has several advantages:

  1. energy-efficient equipment due to high heat conversion efficiency. Accordingly, when buying 1 kW of electricity, an air source heat pump can deliver 3 kW of heat, and a ground source heat pump – up to 6 kW of heat energy. Therefore, by installing a heat pump, you will significantly reduce the cost of maintaining a house;
  2. an advantageous device, as it can work not only for heating housing in the winter, but also for cooling it in the summer, as well as for heating water for hot water supply;
  3. high environmental friendliness, since the device does not emit combustion products into the environment;
  4. minimum costs for heating, cooling the house, as well as hot water when using special tariffs for electricity.

Our engineers recommend paying attention to the following brands of heat pumps:

Electric boiler

An electric boiler is a device designed to heat a home thanks to electricity.

Advantages of an electric boiler:

  1. cost-effective device when using special tariffs for electricity;
  2. no release of harmful and dangerous combustion products into the environment, so the device is considered environmentally friendly;
  3. the availability of weather-dependent and time modulation, which will provide an opportunity to regulate the temperature in the room, taking into account the indicator of the sensor, which is located on the street. In addition, you can program the temperature of the air supply over time. This automation will provide residents with a rational use of electricity.

Despite the obvious advantages of the device, the electric boiler has numerous disadvantages:

  • low efficiency. An electric boiler with 1 kW is capable of delivering 0.9 kW of thermal energy, since heat is lost when converting electrical energy into thermal energy. But, if we compare an air heat pump and ground source heat pump with an electric boiler, then an electric boiler has a lower efficiency;
  • possible power outages and fluctuating mains voltage may cause the device to shut down;
  • availability of high input power consumption for the house. This must be considered before installing the electric boiler, as each dwelling has a limited kW supply.

Alter Air experts recommend using the following brands of electric boilers, which are in high demand among customers:

Solid fuel boiler

Solid fuel boiler – a device designed for heating houses using the process of burning solid fuels. Various types of solid raw materials can be used as fuel: firewood, coal, pellets, and briquettes.

Today, the installation of a solid fuel boiler is not a rational solution, since for the high-quality operation of the boiler, many fuel requirements must be met, and raw materials are considered quite expensive.

Fuel requirements are as follows:

  • raw materials for solid fuel boilers must have a high density. In the case when firewood has low kilocalories, this will provoke poor heat transfer – which will have a bad effect on the efficiency of the boiler and on your finances, since you will have to spend many times more raw materials to ensure the optimum air temperature in the rooms.
  • humidity of raw materials should not exceed 30%. Therefore, raw materials must be stored in a dedicated area to prevent moisture from accumulating.

Gas boiler

A gas boiler is a device that creates thermal energy by burning gaseous fuel. Before installing a gas boiler, it is necessary to consider whether there is a gas supply to the house.

There are several types of gas boilers:

  • ​a turbocharged boiler is a device with a closed combustion chamber, the gas discharge of which occurs through the turbine to the street. It should be noted that the turbocharged boiler is not popular among buyers, since the device does not have a sufficiently high efficiency. Therefore, when a gas is burned, a certain amount of heat is lost.
  • atmospheric boiler is an open-type equipment, for which installation in a special boiler room is a prerequisite. The atmospheric boiler also does not have great demand among consumers. Its disadvantage is that the device, having a sufficiently large heat exchanger power, will not be able to provide the desired modulation.
  • condensing boiler is a device that has higher cost-efficiency and capacity compared to other types of boilers. The condensing boiler has a unique function because the combustion products are not emitted into the atmosphere, but are stored and used in the system in the form of water vapor. Based on this, the condensing type boiler has a high efficiency, which is more than 100%, as well as good technical characteristics.

Therefore, the purchase of a gas condensing boiler is the best option, in comparison with atmospheric and turbocharged boilers.

Since manufacturers of well-known brands Vaillant and Protherm produce not only high-quality electric boilers, but also gas boilers, Alter Air engineers recommend products from these brands.

Solar collectors

​A solar collector is an alternative source of energy, the principle of which is to heat the coolant using the thermal energy of the sun. The equipment is used for hot water supply, household and other needs.

Our projects

A complex of engineering systems in an apartment, Lipskaya street, Kyiv

  • Living room
  • Bathroom
  • Mini-boiler room - 1
  • Mini-boiler room - 2
TROX double slot inline diffuser

Double-slot diffusers from the TROX brand are designed for high-quality air distribution throughout the room. They combine visual aesthetics and high technical potential. Air currents are given in different directions, evenly scattering and avoiding any drafts. Outwardly, only laconic lines on the ceiling remain visible.

Duct air conditioner Daikin FDXM 35F

A low-pressure internal duct unit Daikin FDXM 35F is installed in the ceiling space of the bathroom - it works to cool the bedroom. It is accessed through hatches. The capacity of the air conditioner is enough to service rooms up to 35 m2, which is optimal for a given room. The lowering of the ceiling in a technical room was 300 mm.

Indirect heating boiler Drazice

Vertical indirect heating boiler Drazice OKSE 200 l is designed to provide apartment residents with hot water. The inner surface of the tank is covered with high-quality enamel without nickel, which ensures a long operation of the water heater, and there is also an anti-corrosion coating. The temperature inside can be kept between 7 and 77 ℃. The water heating indicator always shows the current temperature on the front of the tank. There is a fast heating function. This is an excellent solution for an apartment, allowing you not to depend on seasonal blackouts and other inconveniences.

Electric boiler Vaillant Ecoblock

Electric boiler Vaillant Ecoblock An electric boiler Vaillant Ecoblock with a capacity of 6 kW and efficiency of up to 99% works for heating and hot water supply of the entire apartment. It has a wide range of temperature settings for both heating and hot water supply. There are frost protection and 2-level overheating protection. Equipped with eBus data transmission technology. With the help of a capillary thermostat, residents can smoothly regulate the heating temperature in the range from 25 to 85 ℃

Expansion tank Zilmet

The Zilmet expansion tank is designed to compensate extra pressure in the heating system. Works in conjunction with the Vaillant electric boiler above. The special inner lining of the tank prevents the growth of any bacteria, that is, the water does not acquire a metallic taste, does not stagnate or change its properties.

Refiner Ecowater - water softening and filtration system

A modern system for filtering and softening water: cleans water from all kinds of impurities and odors, neutralizes iron, making it soft, pleasant and safe for household appliances, water pipes and human use. The purified water is also suitable for drinking directly from the tap. The refiner does not require changing the carbon filters, and is controlled via WiFi - maximum automation and comfort!

A complex of engineering systems in an apartment, Lipskaya street, Kyiv

COMPLEX OF ENGINEERING SYSTEMS IN A THREE-STOREY BUILDING (380 m2) KG RIVIERA VILLAS

  • BEDROOM
  • Utility room
Duct air conditioner Daikin FBA 60

Кондиционеры Daikin FBA 60 – мощные сплит-системы канального типа, предназначенные для скрытого монтажа практически любого помещения.

HVU with heat recovery JABLOTRON FUTURA L

Highly efficient air handling unit for general ventilation in houses and apartments. Reuses the heat and moisture that are present in the room. Has a "native" VAV-system (variable air supply).

COMPLEX OF ENGINEERING SYSTEMS IN A THREE-STOREY BUILDING (380 m2) KG RIVIERA VILLAS

Ventilation and air conditioning systems in a 3-room apartment, Kyiv, Honchara street

  • Ventilation
  • Air supply
  • Conditioning
Ventilation unit Jablotron Futura L

The Jablotron Futura L ventilation unit with heat and moisture recovery ensures high-quality air exchange at the apartment, and also reduces the load on the heating system in the cold season. Thanks to the Alfa wall controller and the MyJablotron mobile app it is easy to operate the unit.

Airflex flexible insulated duct

Flexible air ducts Airflex have a high degree of plasticity, which allows air to be supplied even to hard-to-reach areas. Moreover, they are covered with a layer of thermal insulation, which prevents heat loss and absorbs noise characteristics during the operation of the ventilation unit.

Galvanized steel duct with thermal insulation

Thanks to galvanized steel, the duct does not suffer corrosion and other damaging influences. Thus, the long-term operation of the climate systems is ensured.

Duct air conditioner Daikin FBA50A9 (indoor unit)

The Daikin duct air conditioner provides efficient room cooling. The FBA series has a rather thin body, which makes it easy to place in a ceiling space. The self-diagnosis function ensures a safe operation of the device and indicates problems if any occur.

Ventilation and air conditioning systems in a 3-room apartment, Kyiv, Honchara street

Engineering systems in the Alter Air office

  • MEETING ROOM
  • SHOWROOM
VENTILATION UNIT ЈАВLOTRON FUTURA L WITH COOL BREEZE MODULE

Jablotron Futura L is an innovative air handling unit that provides ventilation in a house, apartment or office. Provides fresh filtered air to the premises and removes exhaust air. It is autonomous and intelligent, integrates with the smart home system and is controlled by a mobile application. She herself notifies the owners of the need to replace filters or problems that have arisen. The Jablotron CoolBreeze module (white block on top of the unit) works in conjunction with the Jablotron Futura, cooling or heating the air depending on the season or personal preferences of the owners.

AIR-WATER HEAT PUMP VIESSMANN VITOCAL 100S

Viessmann Vitocal 100-S AWB-M 230V 101.A04 "air-to-water" heat pump is designed to provide heating and hot water supply. Consists of 2 separate blocks - internal (which is located in our office) and external (located on the outer wall of the building) .They are connected to each other by means of freon pipes. Through them the refrigerant (R410A) with a high temperature moves to the indoor unit, giving off heat to the system.

UPONOR DISTRIBUTION COMBO

UPONOR distributor manifolds are a Scandinavian approach to heating. They are an element of underfloor heating and contribute to high-quality and efficient heating of a house or apartment. They are produced for hot and cold water, can be interconnected and completely eliminate the risk of pipe breakage.

PUMP GROUP MEIBES

The Meibes pumping group is used to maintain the temperature and supply water in the heating system. Allows you to accurately control the coolant and adjust its parameters. It is distinguished by high reliability and stability of work, with its help it is easy to control the temperature of the coolant. It integrates into almost any modern heating system, is especially widely used in the "Warm floor" circuit.

PUMP GRUNDFOS UPS 25/6

The circulating pump Grundfos UPS 25/6 is small-sized and practically silent, it is distinguished by economical consumption of electricity. It is used for water circulation in heating systems, including floor heating systems, and hot water supply. The Grundfos UPS 25/6 pump is easy to connect and manually adjust.

UPONOR DISTRIBUTION COMBO

UPONOR distributor manifolds are a Scandinavian approach to heating. They are an element of underfloor heating and contribute to high-quality and efficient heating of a house or apartment. They are produced for hot and cold water, can be interconnected and completely eliminate the risk of pipe breakage.

VAV VALVES ABLOTRON VARIOBREEZE

The Jablotron VarioBreeze is a variable air VAV valve, one of the components of the VAV system. It is a control damper that adjusts the air flow in a particular room - from full air flow to shutting off the air flow. That is, it allows for zone ventilation with variable fresh air supply.

PUMP GROUP MEIBES

The Meibes pumping group is used to maintain the temperature and supply water in the heating system. Allows you to accurately control the coolant and adjust its parameters. It is distinguished by high reliability and stability of work, with its help it is easy to control the temperature of the coolant. It integrates into almost any modern heating system, is especially widely used in the "Warm floor" circuit.

COPPER PIPES OF THE HEATING SYSTEM

When organizing engineering systems, we make all piping of boiler rooms on copper. This material is not afraid of temperature changes, does not lend itself to the negative effects of ultraviolet rays and has a service life of 50 years, which is comparable to the service life of residential buildings. Copper pipes ensure the reliability and durability of the entire system.

EXPANSION TANK ZILMET CAL-PRO 35L

The Zimet CAL-PRO 35L expansion tank is designed to compensate for changes in the volume of water in the heating system. It prevents pressure drops and helps reduce energy consumption. Used in conjunction with boilers and pumps. Tanks of the Zilmet brand are distinguished by their high strength, wear resistance and anti-corrosion properties.

ACCUMULATING TANK DRAZICE UKV 102

Accumulating tank Drazice UKV 102 is designed to accumulate excess heat from the heat generator of the heating system (in our case, a heat pump). It is made of steel, the inner surface remains untreated. Covered with non-removable polyurethane insulation. we give preference to the Drazlce brand for the implementation of systems with heating elements.

SILENCER FOR AIR DUCTS

Silencers for ducts are necessary in order to reduce the noise level. This requirement is especially important in office premises. Silencers are installed in the ducts directly behind the ventilation unit and significantly reduce the noise level in the ventilation ducts. In our projects we use the highest quality sound attenuators of well-known brands, for example, Systemair.

Engineering systems in the Alter Air office

System implementation steps

  • Concept Development
  • System Design
  • Equipment selection
  • System installation
  • Commissioning
  • System service maintenance
01
Concept Development

Concept Development

This is the fundamental and first stage, in which all the wishes of the client, the characteristics of the object and the budget are discussed. This information helps you to get a general idea of ​​what your climate system will look like.

02
System Design

System Design

The design of engineering systems in the house includes accurate calculations, the development of drawings and diagrams, planning and location of the heating system, as well as tasks for installers and builders.

03
Equipment selection

Equipment selection

Alter Air will provide several equipment options that will suit the buyer in the best way, with full consideration of the corresponding quality and price.

04
System installation

System installation

Installation of a boiler room and a heat distribution system is not only a matter of comfort, but also of safety. The final start-up of the heating system takes place in the presence of the chief engineer and the client, in order to make sure that all components are functioning correctly.

05
Commissioning

Commissioning

Commissioning is an important stage before the first start of the equipment. It is necessary to check the installation and all settings of the systems in full accordance with the project.

06
System service maintenance

System service maintenance

In a heating system, both the heat source and the heat distribution equipment need regular maintenance to ensure long and efficient operation. We do not recommend neglecting this stage to avoid unpleasant, and sometimes even dangerous consequences.

Video reviews

Implementation of heating and water supply systems in a private house 240 m2, Riviera Village
Implementation of heating and water supply systems in a private house 240 m2, Riviera Village
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Complex of engineering systems integrated in the apartment, residential complex "Novopecherskie Lipki"

FAQ

Which combined heating system is best for a private house?

The best solution for a private house is the installation of a heat pump.

Heat pump is a highly efficient equipment that can work for heating, cooling and hot water supply. Therefore, a heat pump paired with underfloor heating and additional heat sources is able to provide an optimal indoor climate at any time of the year.

In the case when the outside temperatures are low and the heat pump is not able to fully provide the housing with the necessary heat, it is rational to install a hybrid heating of a heat pump with an  electric boiler.

Which combination of heat sources is more cost-effective in Ukraine?

The profitability of combined heating of a private house depends on the availability of resources on the site.

For example, if you have a low-power input to the house, but there are gas pipelines on the site, then installing a gas condensing boiler would be a rational solution. In the case when you do not have a gas supply to the house, but at the same time you have a sufficient amount of kW, it is advantageous to install a heat pump.

Which combined heating system is easier to maintain?

To date, a heat pump is considered the most profitable and easiest device to maintain. The reason for their popularity is the reduction of home maintenance cost. An air heat pump can convert 1 kW of electricity into 3 kW of heat, and a ground source pump – up to 6 kW of heat energy.

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Testimonials and questions
  • 5 / 5

    Валерий Игоревич

    Все понятно и доступно, спасибо за помощь. Поставили котел, а он совсем еле работает. Уже расстроились, что выкинули на ветер немалые деньги. Но оказывается все проблемы решаемы. Оставили вам заявочку на консультацию.