WILO circulation pumps: overview of the model range, installation and maintenance tips

The significance of a properly operating heating system for maintaining the warmth and energy efficiency of our homes cannot be emphasized. The circulation pump is one essential part of this kind of system, and it’s what keeps the entire house at a steady, comfortable temperature. This post will examine WILO circulation pumps in-depth, going over their model selection, installation procedure, and crucial upkeep advice to guarantee the longevity and best possible performance of your heating system.

In the field of plumbing and heating technology, WILO is a well-known brand, distinguished by its superior goods and creative solutions. Warmth is dispersed evenly throughout the house thanks to the effective hot water circulation provided by WILO circulation pumps. WILO has a variety of models that can be used for different heating system configurations, which makes them a popular option for both professionals and homeowners.

It’s critical to comprehend how WILO circulation pumps operate before beginning installation or maintenance. Fundamentally, a circulation pump keeps the hot water flowing continuously throughout the house by moving it from the boiler to the radiators and back. WILO pumps are dependable and efficient because they optimize this process with cutting-edge technology.

Although installing a WILO circulation pump is a reasonably simple procedure, careful attention to detail is necessary to guarantee optimal performance. Starting with your heating system’s specifications and size, choose the right model. After selecting the appropriate pump, the installation procedure entails attaching the pump to the heating system’s plumbing while making sure all connections are tight and properly aligned. To ensure a proper installation, it is crucial to closely adhere to the manufacturer’s instructions and, if needed, seek professional assistance.

Your WILO circulation pump’s longevity and effectiveness are largely dependent on maintenance. Frequent maintenance not only averts possible problems but also enhances the pump’s efficiency, leading to reduced energy consumption and a more cozy living space. Maintaining the functionality of a pump can be greatly aided by performing basic maintenance procedures like cleaning it and looking for wear and tear. Furthermore, monitoring the pump’s operation and acting quickly to fix any strange noises or vibrations can help avert more serious issues in the future.

To sum up, WILO circulation pumps are a dependable and effective way to keep your home’s heating system comfortable and energy-efficient. Through comprehension of the model range, adherence to the proper installation procedures, and maintenance tips, you can guarantee the best possible performance and longevity of your WILO circulation pump, ensuring years of warmth and comfort for you.

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Model Overview, Installation, Maintenance Tips
WILO Stratos PICO Compact, energy-efficient, easy installation, regular cleaning
WILO Stratos High-efficiency ECM technology, simple installation, periodic check-ups
WILO Top-S Silent operation, easy installation, regular lubrication

Briefly about WILO

The world’s top producer of pumping equipment for use in industrial, municipal, and residential settings is WILO Group. Founded in 1872, the company was started by Louis Applander, who started making hardware items.

At the moment, WILO is leading the way in digital innovation. Thanks to its highly efficient and energy-saving solutions, the company compares favorably with its competitors and is able to produce equipment that meets German standards for quality. Presently, this company has 60 businesses that are spread throughout the globe.

Founded in 1997, "WILO RUS" is a subdivision operating in the domestic market. It currently has thirty branches. The business established its own service facility in 2016 with a focus on WILO equipment repair.

Features of pumps brand WILO

The company’s primary goal is to produce equipment that will improve users’ quality of life. Because of this, the dependability of all manufactured devices is a given. Pumps come in a variety of designs, functions, and application areas. The primary benefit shared by all of the models is energy efficiency, which enables you to reduce your electricity costs.


Natural circulation is most frequently utilized in contemporary heating systems. However, there are instances in which the coolant must be forcibly moved. To realize this task, you need to know how to choose the right pumping equipment. Numerous factors influence the decision, but the power indicator—which depends on the water supply’s intensity—is the most crucial one.

The following operational benefits define WILO products:

  1. No heat loss.
  2. Corrosion-resistant materials are used for the manufacture of equipment components.
  3. The system is controlled by automation. As a rule, models have a built-in thermostat, and for displaying all functions there is an LCD display. Can be switched to manual override if desired, which is necessary to control the shaft speed.
  4. Even if a high-power model is chosen, it will work almost silently.
  5. Compact size. This makes it possible to install the pump in the desired location without much difficulty.
  6. It is connected by means of spring-loaded terminals, which does not take a lot of effort and time.
  7. The rotor and motor have a multi-stage protection system, which makes the unit immune to voltage surges.

Modern pumping systems have only one drawback: in order to function fully, they need electricity. As a result, it is not advised to buy them in locations where there are issues with the electricity supply.

Both room conditioning and heating systems can be used with these devices. There are numerous varieties in the model range, each with unique features and functionalities. As a result, selecting the appropriate model for a given application is simple.

The WILO circulation pump range’s prices

WILO circulation pumps

Types of circulation equipment "WILO"

The challenge of selecting equipment for efficient heating of a large space, up to several hundred square meters, confronts many owners of country homes. Because the pressure in a conventional heater system rarely rises above 0.6 MPa, the natural circulation produced by the heater is insufficient.

There are two methods to solve this task:

  1. A closed system of large-diameter pipes is constructed. Here you need to take into account that materials will cost a lot of money.
  2. A circulation pump is added to the system.

The second option is more cost-effective. It will enable you to improve the coolant circulation within the system, thereby raising the heating efficiency. There are two types of modern pumping units made by the WILO brand; their characteristics will be covered in more detail below.

Dry rotor

Long-distance heating systems employ these kinds of devices. The pump motor and rotor are connected by sealing rings that are intended to last for three years. The rotor does not make contact with the heating medium while it is operating. As a result, the gadget essentially doesn’t need servicing or maintenance and is consistently protected against corrosion. Dry rotor pumps have the benefit of having an efficiency level as high as 80%.

Given that these products are fairly noisy, a specially designed room is required for their installation. It’s critical that the fluid contains no foreign objects that could harm the sealing rings.

With wet rotor

These models are used to provide heating for country homes with short heating systems. One notable aspect is the inclusion of a rotor and impeller, which are required to quicken the coolant’s flow. The liquid, which also acts as a coolant for the mechanism, revolves around the rotor.

It is crucial to install these pumps with their shafts horizontally since only then will the casing remain full of water.

The benefits of wet rotor pumps are as follows:

  • They are almost silent during operation
  • have a built-in mechanism for switching the rotor speed;
  • are reliable;
  • are characterized by a long service life;
  • do not require additional maintenance;
  • easy to adjust and repair.

These units have an efficiency of no more than 50%.

Types of pumps by number of speeds

Every pump has a specific number of speeds in mind when it is designed. The equipment’s performance is determined by this parameter. WILO products can be customized to fit a particular system because they come in single and multi-speed versions.


The operating speed has no bearing on these models. When they are turned on, they will only run at full speed. These products are the most economically and technically straightforward because their designs do not include any extra regulators. When the pump needs to run at full capacity, this option is practical. Since these circumstances typically arise, these kinds of products are highly sought after.


The user can select the level of intensity of the pumping equipment operation because there are multiple speeds available. For instance, the device may not always need to run at maximum power, in which case a lower speed may be selected. As a result, less energy is used and the working mechanism experiences less wear and tear.

The user must select which of the three or four speeds that modern equipment can have for the pump to run in. There aren’t any more speeds found.

In the realm of house heating and insulation, WILO circulation pumps stand out as indispensable components. These pumps play a crucial role in maintaining an efficient and consistent flow of hot water throughout a house"s heating system. Offering a wide range of models, WILO circulation pumps are designed for various heating system sizes and configurations. Installation of these pumps is relatively straightforward, but correct installation is key to ensure optimal performance. Regular maintenance is also essential to keep the pump functioning efficiently. By providing an overview of the model range and offering installation and maintenance tips, homeowners can ensure their heating systems run smoothly and energy-efficiently, ultimately enhancing the comfort and sustainability of their homes.


Every manufactured equipment model has a special plate attached with all the required technical designations applied, in addition to the manual. It is evident from reading them what the pump is used for, how well it performs, and a lot more information.

There are now various WILO pump models available:

  • Star-RS (RSL, RSD) – heating systems, air conditioning, cooling;
  • Star-E – industrial models for heating with electronic control;
  • Star-AC – refrigeration and air conditioning;
  • Star-Z – hot water supply;
  • Star-ST – solar thermal systems.

Let’s examine an illustration to better understand it.

Star-XX WILO 25/1-5 YY:

  • Star – type of equipment;
  • eXX – for which systems it is suitable;
  • 25 – an indicator of the inner diameter of the spigot;
  • 1-5 – possible head, measured in meters;
  • YY – single- or three-phase electric motor.

The device name contains these fundamental specifications.

What else the marking makes clear:

  • brand logo;
  • commodity number and date of manufacture;
  • Model;
  • Class F – indicator of resistance to heating of the coolant;
  • IP – level of protection of the pump;
  • PN – permissible working pressure;
  • Tmax – maximum operating temperature level;
  • SV0 – software availability (if additional functionality is connected, this parameter plays an important role);
  • P1max, P1min – ranges of permissible temperature;
  • Imax, Imin – the current required for operation;
  • 1-230 V – voltage.

These are the most widely used designations, and you can already choose the appropriate equipment based just on them. The product passport contains specifications for every other feature.

How to choose a pump as a rule

Many users are unaware of the factors to consider when selecting equipment.

Numerous elements influencing the heating system’s performance are considered, including:

  1. Required amount of heat. Many important conditions apply here: floor area, ceiling height, storey, number of windows and doors and their material of construction. The factor of basement and attic insulation is also taken into account.
  2. Climatic conditions of the area. The choice should be based on the minimum air temperature, the frequency of wind loads and other features.
  3. Design of the heated building. The thickness and material of construction of walls, floors and ceilings are taken into account. The presence of a ventilation system in the house is also important.

To put it briefly, there are a lot of factors to consider when choosing effective equipment. When abilities and knowledge are insufficient, consulting experts is required.

The quantity of batteries that need to be installed, the boiler’s capacity, and the specifics of the water distribution plan are also taken into consideration. A crucial additional indicator is the pressure head. It is calculated using the system’s total hydraulic resistance. This parameter is typically indicated during the house design phase.

The decision is simpler if the living space is small (less than 3000 m 2):

  • 200 m 2 – WILO Star RS 25 2;
  • 350 m 2 – Star RS 25 4;
  • 520 m 2 – Star RS 25 6 or RSD 30 6;
  • 700 m 2 – Star RS 25 7 or 30 7.

Almost all of the equipment produced requires no maintenance and is silent. Additionally, the automatics that are built in are what make control so easy.

A wide variety of pumping equipment for heating rural homes is produced under the WILO brand. Numerous factors, including power, pressure, coolant temperature, and other features, vary amongst the models.


This line of equipment is intended for domestic use and is a good choice for setting up a small home’s heating system.

Two series are present:

  1. StarRS. This includes 12 models labeled from 15-4 to 30-8. Heat-resistant cast iron is used to manufacture the casing. The parts that come into contact with the coolant during operation are made of stainless steel. Adjustment of Star RS is manual, and these pumps can create pressure up to 10 bar. The maximum flow rate is 6 m 3 per hour.
  2. StarRSD. These are more functional devices. They can be used to increase the pressure in the system. Appliances connected to such a pump are able to last longer. In addition, the module can be simultaneously connected to two circuits at once. The device is equipped with a special switch necessary to adjust the electric motors. The weight of the device is only 5 kg, but it is able to provide the necessary pressure for a house with an area of 750 m 2 .

It is worthwhile to draw attention to a different model 15 WILO Star Z Nova that is utilized for hot water system recirculation. Every model has a different head and capacity. These gadgets start at 3600 rubles in price.


Large cottages and apartment buildings’ heating systems use this type of pump. They can be connected to systems where the heating area does not exceed 1400 m 2 because of their excellent performance.

One notable attribute is the inclusion of thermal insulation, which qualifies the unit for outdoor installation. Ten bar is the maximum working pressure.

The models that follow are created:

  1. RLиS. These are the most productive devices with a wet rotor, which are equipped with one or two motors. Connected to a single- or three-phase network. The three-speed pump is equipped with a mechanical switch.
  2. Z. By purchasing this unit, you do not have to worry about the quality of the coolant. Often chosen model Z 15 TT 1, which is not afraid of calcium or magnesium precipitation. There are no strict requirements in terms of installation location.
  3. TOP. These are basic devices, the number of which is more than 50. They differ in flange size and capacity.

To put it briefly, if you’re looking for a device for a big house, you should focus on the Top series as they have a great selection of models. The cost of purchasing a circulation pump for WILO heating starts at 15150 rubles.


In the realm of pumping equipment, this is a relatively recent invention. The integrated LCD display, which is used to operate the device, is a crucial component. The information required to operate the device is shown on the screen. The range was designed assuming that large heating systems would be installing the pumps. One can connect to a boiler that has a minimum capacity of 25 kW.

  • power adjustment from 2 to 48 W;
  • Availability of night mode, during which minimum power is consumed;
  • automatic adjustment of operating parameters, for which the controller must be connected to a room thermostat.

There are two intriguing models on the list: one has a bronze body and a higher capacity (16 bar). When used in energy-saving systems, this range works best. The price is 10485 rubles at launch.


These models have anti-purge protection and an electronic control unit. Elimination of solid deposits from the liquid serves an additional purpose. mechanical mode switching. When achieving economy, the device automatically switches to automatic mode. The operating information, such as the system pressure and the amount of electricity used by the pump, is displayed on the indicator panel.

Since this series is among the most recent that the company has released, it has incorporated every advantageous aspect of its forerunners. These contemporary gadgets start at 8900 rubles in price.

Installation features

There are various techniques that can be used for installation.

Two schemes exist:

  1. Single-pipe. The coolant is constantly consumed, with low temperature variations.
  2. Two-pipe. With high differentials and variable flow rate.

Examine the product’s instruction manual thoroughly before beginning any installation work. Selecting the installation location is crucial as well; specifically, the gadget needs to be reachable for maintenance. This kind of equipment is typically installed prior to the boiler. Installation on the supply is irrelevant because it could cause a vacuum.

  1. The remaining liquid is drained from the system.
  2. The pipeline is cleaned.
  3. The pump itself and auxiliary fittings are installed.
  4. The system is filled with liquid, from which excess air is removed.

To ensure a successful installation, the bypass must be prepared. It will enable the device to function even in the event of a power outage. It is imperative that the bypass and main pipe have distinct diameters.

Following these guidelines will make the installation manageable even for a novice craftsman:

  1. To achieve maximum performance, the shaft of the unit should be in a horizontal plane.
  2. The terminal box is mounted on top.
  3. There should be a ball valve on each side of the pump, which is necessary for future maintenance.
  4. The system must have a filter that removes small particles from the coolant.
  5. A bleeder valve must be installed on top of the bypass line.
  6. The presence of shut-off valves is necessary to prevent water leakage.
  7. An expansion tank is required for an open heating system.
  8. To improve performance, the connection points of the device must be properly sealed.

The key to the effective operation of the pumping equipment is proper installation followed by strict adherence to all guidelines and recommendations.

Recommendations for operation and maintenance

Numerous issues may arise when the circulation pump is in operation. Because of their straightforward design, WILO products can be maintained by you without the assistance of a professional.

Frequently occurring issues and their fixes:

  1. The shaft has stopped turning. These pumps are so quiet that it is impossible to immediately determine the cause of failure. A special shaft rotation tester is used to detect malfunctions. If the scale shows no movement, the device should be disconnected from the power supply. This situation sometimes occurs when the pump is idle for a long time or when a foreign object gets inside the chamber. In either case, the pump will have to be disassembled and the shaft will have to be unscrewed, after which the foreign matter will be removed from it.
  2. Creaking. Most often it happens when the system is heated up. A squeaking sound is heard when the motor pulley starts to contact the starter plug. To eliminate this problem, it is sufficient to install a gasket on the plug. If this does not help, the part of the pulley that rubs on the bushing can be sawed off, but not more than 3 mm.
  3. Pump stalls. Usually, the cause lies in the formation of limescale, which should be cleaned with a brush. If the system has a coarse filter, such a problem almost never occurs.
  4. Pump vibration. This is an indication that the bearings need to be replaced. The appearance of vibration can also indicate a drop in pressure, which should be increased. Sometimes it helps to reduce the viscosity of the coolant.
  5. Low water pressure. The problem indicates that the device is not connected correctly. This can happen if the filter is dirty, if the water pipes are faulty or if there is a large amount of glycol in the coolant.

These crises are incredibly uncommon and are typically the result of incorrect equipment connections. Either way, they can be easily fixed without the need for specialized equipment.

How to recognize a fake

Since WILO is a widely used piece of equipment, counterfeit versions are frequently encountered these days. A warranty is in place if the product is original. Chinese WILO pumps fall into a different category; these pumps only last two to three years, compared to the original’s fifteen years.

How to spot a fake at a glance:

  1. The original packaging has a cubic shape with a quality glossy paint finish. Fakes are stacked in a rectangular box.
  2. The original device has a sticker attached, while counterfeits have the article, serial number and other data printed on it.
  3. The serial number is not stamped on the housing of a counterfeit unit.
  4. The arrow showing the direction of water movement is large on the original, while on Chinese products it is small.

It’s important to consider the internal construction in addition to the aesthetic aspects.

  1. The rotor and stator are labeled on their housings with the serial number and date of manufacture.
  2. In the original models, the upper part of the device is detached from the rotor, which makes the device repairable.
  3. The electronics must also be labeled.

These are the main characteristics that set the original apart from the Chinese knockoff.

WILO circulation pumps ensure dependable and efficient operation by providing a complete solution for heating systems. Every need can be met by one of the many models of pumps that are available. WILO offers options to suit different needs, whether you are installing a new system or upgrading an old one.

WILO circulation pump installation is simple, but for best results, it’s imperative to adhere to the manufacturer’s instructions. In addition to ensuring efficiency, proper installation increases the pump’s lifespan. WILO pumps are made to be easily installed, regardless of whether you’re a skilled installer or a do-it-yourself enthusiast.

Although WILO circulation pump maintenance is not too difficult, it is an essential part of keeping the system functional and long-lasting. Frequent maintenance tasks, like cleaning the pump and looking for wear indicators, can help stop problems before they start. Homeowners can make sure their heating systems keep performing at their best by adhering to WILO’s maintenance recommendations.

WILO circulation pumps are, in summary, a dependable and effective option for heating systems. WILO pumps offer a solution that satisfies the requirements of both professionals and homeowners thanks to their range of models, simplicity of installation, and low maintenance requirements. You are making an investment in the durability and effectiveness of your heating system when you choose WILO.

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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