How to choose a boiler in spent oil for heating a private house

Selecting the ideal boiler for heating your home is an important choice that affects affordability, effectiveness, and comfort. A boiler that runs on spent oil is one option that is becoming more and more popular; it provides an affordable and sustainable heating solution. Used engine and machinery oil is recycled and converted to heat by spent oil boilers. You can choose a spent oil boiler for your house by following the advice in this article.

First, think about how big your house is and how much heat you need. The heating capacity of the boiler should be appropriate for the area and square footage of your home. A boiler that is too big can result in inefficiencies and increased fuel consumption, while a boiler that is too small might have trouble keeping your house warm. Accurately evaluate your heating requirements to choose the right boiler size for maximum efficiency.

Another important consideration is efficiency. Selecting a spent oil boiler with a high efficiency rating will optimize heat output while reducing emissions and fuel consumption. Efficiency ratings show how much of the energy in the fuel the boiler can turn into heat that is useful. Selecting a more energy-efficient model can lower environmental impact and result in long-term savings on heating expenses.

Think about the ease of servicing and maintenance requirements of a spent oil boiler before making your choice. Maintaining a boiler at regular intervals will keep it operating efficiently and extend its lifespan. Choose a model with easily accessible parts and easy-to-follow maintenance instructions for ease of upkeep and servicing. This will guarantee dependable and effective operation of your heating system over time.

Additionally, when selecting a spent oil boiler, give safety features top priority. When working with heating systems, especially those that burn oil, safety must always come first. Seek for boilers that have sophisticated safety features and controls, such as temperature sensors, pressure relief valves, and automated shut-off mechanisms. Throughout the heating season, these features help to ensure safe operation and prevent accidents.

Finally, take into account the total cost of operation and installation. Consider the boiler’s initial cost as well as installation and continuing fuel expenses. To strike a balance between your initial investment and long-term savings, compare various models and brands. Certain boilers could be eligible for rebates or incentives that would cover the installation costs, increasing their appeal from a financial standpoint.

In conclusion, there are a number of considerations to make when selecting a spent oil boiler for your home’s heating, including size, efficiency, upkeep requirements, safety features, and overall cost. You can have economical, eco-friendly, and efficient heating for your house by weighing these considerations and choosing a boiler that fits your needs.

Consider Your Heating Needs Assess the size of your house and the heating requirements to determine the boiler capacity needed.
Efficiency and Energy Savings Look for boilers with high efficiency ratings to save on fuel costs over time.
Choose the Right Type of Boiler Select between regular, combi, or system boilers based on your hot water needs and existing setup.
Check for Safety Features Ensure the boiler has safety features like overheat protection and pressure relief valves.
Consider Installation and Maintenance Factor in installation costs and ongoing maintenance requirements when making your decision.

Choosing the right waste oil boiler for heating your private house involves considering several key factors. Firstly, evaluate the heating requirements of your home, including the size of the space you need to heat and the climate in your area. This will help determine the heating capacity needed from the boiler. Next, assess the efficiency and environmental impact of different boiler models. Look for boilers that meet efficiency standards and have appropriate emissions controls to minimize pollution. Consider the type of waste oil the boiler can use and ensure a convenient and reliable source for this fuel. Additionally, think about maintenance requirements and the availability of support services for the chosen boiler. Finally, factor in the initial cost and long-term savings associated with each boiler option to make a well-informed decision that aligns with your heating needs and budget for your private house.

What are boilers in waste oil

What is it for and how they are used

The following are the primary justifications for selecting boilers with waste oil burners:

  • In the place of residence, there is temporarily absent or not foreseen a gas main;
  • financial benefit, t.To. The cost of working out is one of the lowest among fuel options;
  • free access to large volumes of development or the possibility of purchasing it for a symbolic price (the most distribution places – one hundred and car repair shops, agricultural enterprises, any type of fleet, factories, railway depot);
  • large heated area, from 600-800 m 2 .

This further streamlines the installation process because heating equipment installation is not necessary. Fuel can be stored both indoors (in the boiler room) and outdoors. For a typical house measuring 100–150 m³, 1.5–2.3 tons of fuel will suffice during the heating season.

Device and principle of operation

Only flooring single-circuit models of boilers with a water heating contour operating on waste oil are available. These days, two-circuit boiler units are just nonexistent. They also require energy, as the voltage produced by heating steel is insufficient to run the fuel pump, automation, and turbocharger.

Given that fuel must be heated to extremely high temperatures prior to burning, the working principle of boilers differs slightly from that of diesel or gas equivalents. Two cameras are installed in the boilers for this purpose: the first is for preliminary warming up, which is typically found beneath the burner’s outer section, giving it even more dimension; the second is the combustion chamber, which is a standard feature of all boilers and is where fuel is burned and heat is exchanged while the heat exchanger operates.

Examine the boiler’s working principle in phases while using spent oil.

  1. From an external tank for storing fuel using a fuel pump (depending on the model, it comes in the kit), the oil is supplied to the preliminary heating chamber, the float regulates its volume.
  2. The heating element (usually the heater) heats the oil to the required operating temperature (usually 70-110 ° C, depends on the boiler and burner model).
  3. Upon reaching the operating temperature, through the nozzle, the fuel is supplied to the combustion chamber, where it is mixed with primary air at the retaining washer. For more efficient burning and enhancing heat flow inside the combustion chamber, the supply of the mixture is additionally enhanced by the operation of turbocharges.
  4. The walls of the combustion chamber is a heat exchanger, inside which the coolant is located.
  5. Accordingly, the heat exchanger heats up during fuel burning and transfers heat to the coolant, which is natural or forced (using the circulation pump) in the way circulates the heating system.

Additionally, there are vertical drip models that operate on a slightly different principle and have a slightly different device, such as the domestic Ecoboil and slanting KDO:

  1. From an external tank for storing fuel, the oil is supplied to the hot bowl inside the combustion chamber.
  2. When it enters the bowl, it immediately evaporates.
  3. Air is pumped into the combustion chamber, the air-oil mixture burns without a trace.
  4. The walls of the combustion chamber are a water shirt that heats up and transfers heat to the coolant.

The air-oil mixture should burn at a temperature specified by the manufacturer (typically 600 °C). If this temperature is exceeded by even +-50 °C, the combustion process won’t be completed, which will increase the formation of hazardous materials and contaminate the combustion chamber and other boiler components. For this reason, it’s best to let a licensed expert handle the commissioning of a new boiler. Furthermore, if the boiler is delivered by a specialist to finish the commissioning work and there is no matching stamp in his passport, many manufacturers will not apply a guarantee for the boiler.

When choosing between standard and vertical models, we advise going with the first since it is generally more efficient and produces soot and pollution one order of magnitude more slowly. For models with a standard structure, cleaning should be done every 1.5–2 weeks on average. However, soot and other combustion products in vertical or homemade models need to be cleaned every day, which takes about 5 minutes to complete.

Fuel consumption

Fuel can be made from motor, hydraulic, or transmission oils. Except for certain models, using fuel oil, vegetable oils, or thermal or diathermic oils that are intended for use as coolants is not advised.

Depending on the manufacturer and composition quality, one liter of waste oil can have a specific heat of combustion of 11–11.3 kW. This indicates that 1 liter of fuel is needed to produce 11 kW of heat. However, even contemporary boilers are not flawless; their average efficiency ranges from 85 to 90%, i.e. Roughly 10–15% of the heat input is lost to the coolant.

In summary, figuring out how much fuel a boiler using waste oil uses is fairly easy: Boiler power in kW / 10.

For instance, a boiler that runs continuously at 30 kW will use 3 l/hour. Numerous manufacturers provide the equipment passport with the cost parameters. It is crucial to realize that these indicators are provided under the assumption of constant, high-power operation, which is extremely uncommon. Boilers normally operate for no more than one-third of the day, so you can safely reduce these calculations by two to three times.

In actuality, depending on the level of insulation in the house, the boilers used to heat a typical 100–120 m 2 home use 5–8 liters of oil every day. In 2020, waste oil will typically cost between 10 and 15 rubles per liter.

How to select a room thermostat to reduce monthly heating costs by up to 30%

Reviews of household boilers for working with a water circuit: advantages and disadvantages

Advantages Flaws
Accessibility and symbolic fuel cost High initial cost of boilers – almost all models cost more than 100 thousand. rub.
Simplicity and reliability – the term of the trouble -free service of boilers for working out is comparable to gas or diesel analogues, but, of course, depends on the manufacturer The need for a separate room for a boiler room
Environmental friendliness – with the proper operation of the boiler, fuel is completely burned, releasing only harmless nitrogen and carbon dioxide Need for high -quality ventilation
Ease of installation and connection – for installing the boiler it is not required to arrange permission, it is not necessary to organize large areas for storing fuel High noise of work, however, according to the reviews of the owners, the boiler is not heard even through the relatively thin walls of the boiler room
Autonomy – classic models do not require human intervention and can work for months (with the exception of the need for regular cleaning) The need for regular cleaning (every 24 hours) more budgetary vertical models
On average, lower (by 3-7%) efficiency than gas or diesel analogues (however, this is a barely noticeable drawback in view of the cheapness of fuel)
Lack of double -circuit and wall models
Automation of inexpensive models has quite limited functionality

How to choose a boiler in spent oil for heating a private house

The material of the heat exchanger

There are two kinds of proven oil heat exchangers used in boilers:

  • steel – The most common and inexpensive in production, but from the inside is very subject to corrosion. Even in spite of processing by various anti -corrosion compounds, it rarely serves more than 20 years. However, the steel heat exchanger is lighter, resistant to temperature drops and mechanical impacts.
  • cast iron – heavy and durable heat exchanger. Cast iron is practically unable to corrosion and serves at least 30 years. However, it is vulnerable to mechanical damage and temperature changes, and the cost of its production allows you to use cast -iron heat exchanger only on the most expensive boilers models.

Types of gas burners for flame regulation

Similar to their gas equivalents, the burner can be:

  • single -stage – working in the OL/Off mode, t.e. no power adjustment;
  • Two -stage – a burner operating at 50 or 100% of the power, which allows you to achieve greater efficiency, reduce the load and increase the service life;
  • Modulated – extremely rare phenomena when working with waste oil, but also the most effective. The power of the burner is adjustable in the range of 10-100% (the exact range depends on the model), which allows for continuous combustion at minimum power-the most optimal operating mode of the boiler.


The ratio of fuel consumed to the volume of thermal energy secreted and accumulated by the coolant is known as the utility coefficient, or efficiency; in other words, it represents the boiler’s efficiency. Depending on the model, boilers have an efficiency of 85–90% on average for working out.

In contrast to gas counterparts, where fuel costs are many times higher, consider the boiler unit’s efficiency when making decisions about the remaining listed criteria.

The minimum necessary power

The calculation of the minimum boiler power required for a typical, uninsulated home with two bricks in the masonry and 2.7-meter-high ceilings is as follows: one kW for each 10 m^2 of heated space. Additionally, we advise installing a 15-20% power supply.

For instance, the boiler’s minimum required power for a 200 m 2 home in the Moscow Region’s climate zone is 200/10 * 1 * 1.15 = 23 kW.

In over 95% of cases, this approach is sufficient. The corrective coefficients, which allow the power to vary by 10–50%, are taken into consideration if the home has high ceilings, a larger glazing area, or is situated in either the country’s extreme north or south.

How to precisely determine the boiler’s required power? Each calculation, formula, and corrective coefficients

Additional criteria

Once the primary selection criteria have been determined, it is advisable to consider additional indicators that impact the boiler’s operating comfort:

  • The presence of sound insulation – A layer of sound insulation is a rare occurrence on boilers that burn the development in view of and so quite noisy work and install them in separate rooms. However, some models are able to make noise up to 70 dB, and manufacturers do not always care about sound insulation.
  • Automation functionality – In addition to various operating modes and thin settings, simply necessary for a modern expensive heating boiler is the presence of a room thermostat that allows you to adjust the operation of the boiler depending on the temperature in the room, which is more correct and economical. In addition, even the simplest thermostats have many settings and the ability to program the boiler work for the next day or weeks, which can significantly save fuel, for example, programming for working hours (when no one is at home) a temperature reduction of up to 15 ° C.
  • safety – also important for the modern boiler and the safety of the heating system are the presence of protection against overheating, protection against stopping the circulation pump, and freezing prevention mode.

Best famous manufacturers and models: characteristics and prices

Danvex B-30

One of the best boilers made in Finland for heating a private residence. Apart from the 35.6 kW version, there exist other variants with heat production ranging from 60 to 220 kW. It has a high degree of dependability and a thoughtfully designed system to make cleaning and maintenance easier (such as a larger diameter smoke pipe and firebox, a vertical chimney that allows soot to pour into the ash, and a door that opens with the burner so that access to the combustion chamber is accomplished by pressing a handle).

The boiler is renowned for its small size, functional automation that includes a GSM module connection capability, and 88% efficiency, which is among the highest for this kind of boiler. Fuel consumption at 3.3 liters per hour of maximum load. The model can be connected to both external temperature sensors and an indoor thermostat, and it has all the required protective modes and functions.

The only known drawbacks are that it weighs a lot (157 kg), is noisy when operating, lacks a fuel pump, and is extremely expensive. Finland is the producing nation.

Nortec B70 (WB 40)

Model from a Russian manufacturer, 40 kW in capacity. It is identical to the previously mentioned Finnish analogue in terms of design and operation, with the same heat exchanger composed of heat-resistant steel. However, it is larger in size and has less useful governing bodies. It is also less convenient to maintain.

Nevertheless, it also offers a number of noteworthy benefits, such as being significantly less expensive, coming with a complete fuel node (pump, filters, tank) that is integrated with the boiler, and having the ability to operate on a variety of fuel types (fuel oil, raw oil, stove fuel).


The 15 kW vertical capacity is made in Russia. The model stands out for its incredibly low cost, small size, dependability, and inclusion of an oil pump in the kit. It can burn kerosene in addition to exercising. Although the model has an automatic control unit, making it one of the best drip oil boilers available, the fuel spraying of standard models is still subpar.

The requirement for daily cleaning and the standard of domestic assembly are other well-known disadvantages. The installation procedure and owner reviews indicate that the model has consistently operated for over seven years.

36 800-39 900 rubles is the price.

Blood KDO-2

Another 28 kW domestic drip type. Although the boiler is more expensive and has less functional automation, it operates on the same design and principle as the Ecoboil. The benefit is a detachable pyrolysis bowl (where the oil evaporates), which makes cleaning easier and makes replacement simple in the event that it burns.

Cost: 44 500–50,000 rubles.

Prices: Final table

Model Price, rub.
Danvex B-30 250 000-275 000
Nortec B70 (WB 40) 146 000-175 000
Ecoboil-18 36 800-39 900
Blood KDO-2 44 500-50 000

Selecting the ideal boiler to use spent oil to heat your home requires careful consideration of a number of crucial factors. First and foremost, the size of your home and its heating needs are important considerations. As smaller homes have different needs than larger ones, it is critical to calculate your heating load.

Second, think about the boiler’s dependability and efficiency. Seek for a model that consistently produces heat while burning spent oil efficiently. A dependable boiler will guarantee trouble-free heating throughout the winter without requiring frequent repairs.

The impact on the environment is another important factor. Select a boiler that complies with environmental guidelines and standards. This promotes sustainable efforts by lowering emissions and guaranteeing the proper disposal of spent oil.

Evaluate the installation and maintenance needs as well. Select a boiler that will be simple to maintain and install. In the long run, this will save you money and time on professional services.

Finally, pay attention to safety features. To ensure smooth operation and prevent accidents, a good boiler should have safety features. For peace of mind, give priority to boilers with integrated safety features and controls.

In summary, choosing the best boiler for using spent oil to heat your home requires weighing a variety of considerations, including size, efficiency, impact on the environment, maintenance, and safety. You can guarantee effective, dependable, and environmentally friendly heating for your private home by carefully weighing these factors and selecting a boiler that fits your needs and values.

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