DAB EVOTRON vs EVOSTA2 – which pump to choose

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DAB EVOTRON vs EVOSTA2 – which circulation pump to choose for your system?

When a customer comes into the store and says they need a circulation pump for the boiler room, the first question we ask is not "what power?" but "what kind of system do you have and what do you expect from the pump?". This distinction is key when comparing two of the most popular models in the portfolio of Italian manufacturer DAB – the EVOTRON range and the EVOSTA2 range. Both are so-called class A pumps, both have electronically adjustable motors with permanent magnets (EC motor), both are mounted on standard flanges, and both are energy efficient in accordance with the European ErP 2013/622/EU directive. Yet despite this, they differ in several essential aspects – and it is precisely these differences that determine which model is right for a specific application.

In this article, we will go through both ranges in detail: construction, control modes, suitable applications, installation, operating economy, and real-life scenarios from practice. If you are interested in a broader context of pump selection, see the article How to choose a DAB circulation pump for heating or What DAB pump power do I need for my house – both are available in this Knowledge Center.

Basic differences between EVOTRON and EVOSTA2 – summary table

Before we dive into the details, let's look at a brief comparison of both ranges in a table. The values are taken from the technical documentation of DAB and refer to the most commonly sold sizes (DN 40, construction length 130 or 180 mm).

Parameter	DAB EVOTRON	DAB EVOSTA2
Motor type	EC – permanent magnets	EC – permanent magnets
Energy class	A (ErP 2015)	A (ErP 2015)
Max. power (40/130)	~45 W	~45 W
Control modes	Prop. pressure, const. pressure, const. speed	Prop. pressure, const. pressure, const. speed + AutoAdapt
AutoAdapt (automatic adaptation)	No	Yes
Display / control	Button + LED indicator	LCD display + button
Consumption indication	Not directly	Yes (Wh on display)
Possibility of backup power supply	No (standard)	Yes (special set)
Typical price (DN40/180)	Lower	Slightly higher
Target application	Simple systems, renovations	Intelligent control, larger houses, heat pumps

Construction and motor – what they have in common

Both ranges are based on the same foundation: a wet-running EC motor with permanent magnets on the rotor and a frequency converter electronics directly in the pump head. This is a crucial point – it means that unlike old three-speed pumps with AC motors, the speed here is continuously adjustable from minimum to maximum, with the motor operating at 80–90% efficiency even under partial load. In practice, this means the pump consumes electricity in proportion to actual demand – not fixed like old types.

The hydraulic part is made of cast iron (body) and stainless steel or composites (impeller), which ensures resistance to standard heating water with corrosion inhibitors. The construction lengths are standard – 130 mm for smaller versions, 180 mm for larger ones. The connection is G 1½" or G 2" threaded, compatible with all common flanges on the market.

The rotor is wet – this means that the heating water directly lubricates and cools the bearings. No sealing packing, no oil, minimal noise (typically under 35 dB during normal operation), and long life without maintenance. Both models are certified for media temperature up to 110 °C and operating pressure up to 10 bar.

Control modes – here is where EVOTRON and EVOSTA2 really differ

This is the core of the entire comparison. Both models support three basic control modes that every experienced installer knows:

Constant speed (1/2/3) – the pump runs at a fixed speed. An outdated method of control, suitable only where you don't have thermostatic valves or want to manually set the flow without any automation.
Constant pressure (Δp-c) – the pump maintains a constant differential pressure regardless of flow. Suitable for systems with low pressure losses in the piping, for example, underfloor heating with short loops.
Proportional pressure (Δp-v) – the pump reduces the reference pressure linearly with decreasing flow. This is the recommended mode for most modern systems with radiators and thermostatic valves – when the valves close, the pump automatically "quiets down" and saves energy.

While EVOTRON handles these three modes reliably and simply, EVOSTA2 adds a fourth, key mode:

AutoAdapt – the intelligent brain of EVOSTA2

AutoAdapt is a patented algorithm that, during the first few days of operation, teaches the pump what differential pressure the system actually needs. The pump monitors flow, pressure, and energy consumption, evaluates the cycles of thermostatic valves, and gradually sets its own optimal operating curve – all without the need for a technician's intervention. As a result, in real-world conditions, EVOSTA2 can consume 10–25% less electricity than the same pump manually set to proportional pressure.

From practice: in a family house with 8 radiators and Danfoss thermostatic valves, where we installed an EVOSTA2 40-70/180 three years ago, the pump settled on its own after two weeks to a working point around 2.2 m, and at full valve opening, it reached 3.8 m. Consumption stabilized at an average of 11–14 W depending on the season. A comparable old class C pump there consumed 68–90 W. The difference was dramatic.

DAB EVOTRON 40/130 – for whom is it intended?

The model DAB EVOTRON 40/130 is a typical "workhorse" device – reliable, simple, and cost-effective. Its strength lies in its simplicity: you have three control modes, set the right one, and forget about it. For the installer, it means a quick installation; for the customer, it means easy operation.

EVOTRON is suitable for:

Renovations of older systems – where there are old cast iron radiators without thermostatic valves and the system runs almost constantly at full capacity throughout the heating season.
Smaller houses and apartments up to 150 m² – where there is no need for sophisticated control and a simple proportional pressure with one-time settings is sufficient.
Secondary circuits in simple systems – for example, a circuit to a hot water storage tank, a direct circulation solar circuit, or air heating distribution.
Projects with a limited budget – when the investor wants energy class A but does not want to pay a premium for features that will not be used.
Systems with fixed flow rates – for example, underfloor heating behind a thermostatic mixer, where control is handled differently and the pump operates at a constant point.

The construction length of 130 mm is compatible with most modern boilers and manifolds, making it easier to install in more compact boiler rooms. Power consumption ranges from 5 to 45 W depending on the set curve and current load under normal conditions.

DAB EVOSTA2 – for whom is it intended?

EVOSTA2 is a premium model from the same family. The basic hydraulics and motor are practically the same, but the intelligence in the electronic head is a level higher. Three key improvements over EVOTRON are:

AutoAdapt – described above. Invaluable in systems where the load changes according to the number of open thermostatic valves.
LCD display with consumption indication – you can see directly how much the pump consumes in real time (in Wh/kWh). Customers appreciate this when verifying the investment's benefits; technicians appreciate it for diagnostics.
Compatibility with backup power – a special version of the set allows connecting a backup UPS power source (battery), which is relevant for heat pumps or in areas with an unstable grid.

To work with EVOSTA2, look at the products directly available in our online shop. The basic version is KIT with flanges DAB.EVOSTA2 40-70/180, which includes the pump with mounting flanges and ball valves – everything needed for standard installation. If you are working in a system with dirty water or an old system, we usually recommend the version KIT with flanges DAB.EVOSTA2 40-70/180 – FILTERBALL, which adds a ball valve with an integrated angled filter to capture coarse mechanical impurities before they enter the pump.

EVOSTA2 is suitable for:

Modern systems with thermostatic valves – where the flow changes significantly during the day and AutoAdapt can save real money.
Air-to-water heat pumps – where sensitivity to flow is higher and compatibility with backup power is practical due to protection against power outages.
Condensing boilers with modulation – where fine-tuning the pump's operating point directly affects the boiler's condensing performance and efficiency.
Houses over 150 m² or multi-storey buildings – where hydraulic imbalance is more common and intelligent adaptation brings visible results.
Projects where the customer monitors costs – the display with real-time consumption is an excellent argumentative tool even during service visits.

Installation and hydraulic position – what you need to know

Both models are installed in the same way – the shaft position must be horizontal. Never install a pump with electronics pointing downward – this can cause an air pocket around the rotor, bearing overheating, and premature failure. The electronic head can be rotated into 4 positions at 90° intervals, allowing you to adjust the cable direction according to the specific installation situation.

Always install the pump on the return line (cold side) – this is to protect the electronics from high temperatures and because the return line has lower vapor pressure and a lower risk of cavitation. Install ball valves on both sides of the pump – this allows for replacement without the need to drain the entire system. This is why sets with bypass valves, as mentioned above, are so popular.

Deaeration is also mandatory: before the first start-up, deaerate the system, as air in the hydraulics is the most common cause of pump noise in the first few days of operation. The EVOSTA2 has a function for automatic deaeration at start-up (several cycles of increased speed), while the EVOTRON does not have this function – deaeration must be done manually via the bleed valves on the radiators.

A detailed installation procedure can be found in the article Installing a circulation pump from DAB step by step in this Knowledge Center.

Energy efficiency – how much will you really save?

This is a topic that often surprises customers. Let's look at some real numbers.

An average Slovak boiler operates for 6,000 to 7,500 hours per year (approximately 250 days × 24 hours = 6,000 h for year-round operation including DHW heating). An old pump of class C may have a power consumption of 80–120 W. At 80 W and 6,500 h/year: 80 W × 6,500 h = 520 kWh/year. At a cost of 0.20 €/kWh, this amounts to 104 € per year just for the pump operation.

The EVOTRON in proportional mode in the same system consumes an average of 15–25 W. At 20 W: 20 W × 6,500 h = 130 kWh/year → 26 €/year. Savings compared to the old pump: 78 €/year.

The EVOSTA2 in AutoAdapt mode in the same system consumes an average of 10–18 W. At 14 W: 14 W × 6,500 h = 91 kWh/year → 18.2 €/year. Savings compared to the EVOTRON: 7.8 €/year. The price difference between the EVOTRON and the EVOSTA2 is typically 20–50 €, which, given this difference in consumption, is returned in 3–7 years.

From a purely economic perspective, the difference between the EVOTRON and the EVOSTA2 in terms of consumption is relatively small – both are orders of magnitude better than old pumps of class C or D. The real value of the EVOSTA2 is not primarily in lower consumption, but in comfort, automation, and additional features (backup power supply, display, AutoAdapt for more complex systems).

For more information on energy class A and its practical impact, read the article Energy class A DAB pumps – what it means and why it's worth it.

Backup power supply for EVOSTA2 – a special situation for heat pumps

One topic that is increasingly appearing in practice, especially with the growing number of heat pumps, is the backup power supply for the circulation pump. With a heat pump, simple physics applies: if the pump stops circulating water during a power outage, the heat pump can freeze the heat exchanger or damage the compressor. Compressor failure is the most expensive possible repair for the entire unit.

A special set KIT with bypass DAB.EVOSTA2 40-70/180 + backup power supply is available for the EVOSTA2, which includes a battery backup power supply capable of powering the pump during a power outage for several hours. The backup power supply automatically switches without user intervention – the pump simply continues to operate. For more information on when and why to use a backup power supply, you can read the article Backup power supply for DAB pump – when and why to use it.

The EVOTRON does not have a backup power supply in its standard offering – this feature is exclusive to the EVOSTA2 series. If you are designing a system with a heat pump, solar collector, or any device where a circulation pump failure could cause damage to more expensive technology, the EVOSTA2 with a backup power supply is the clear choice.

Filterball set – why it's worth it for renovations

The Filterball version of the EVOSTA2 set deserves special mention. In practice, it often happens that we install a new pump into an old system from the 80s or 90s – steel pipes, old cast iron radiators, rust and sediment in the system. Such water can quickly damage the ball bearings of the pump or block the rotor.

The version KIT with bypass DAB.EVOSTA2 40-70/180 – FILTERBALL solves this situation by integrating an angled mesh filter directly into the body of the bypass on the pump's inlet side. The filter captures mechanical impurities larger than 0.5 mm, can be cleaned without disassembling the pump, and extends the life of the entire unit. We always recommend this version for renovations – the additional cost compared to the standard set is minimal, but the protection is real. For more information on cleaning and filtration in the system, read the article DAB pump with filter or without – is the Filterball set worth it or Cleaning and maintenance of DAB pump – how to extend its lifespan.

Noise and comfort – real-life experience

In modern low-energy houses, boiler rooms are often integrated directly into the living space or in a technical room with thin walls. Pump noise is not a marginal issue here – it is a factor of living comfort. Both models are very quiet in normal operation: at 10–20 W power consumption and in proportional or AutoAdapt mode, you can practically only hear the gentle flow of water in the pipes.

The most common source of noise is not the pump itself, but air in the system (gurgling) or cavitation due to insufficient inlet pressure. The EVOSTA2 slightly better handles the limitation of cavitation conditions – its electronics detect abnormal vibrations and automatically adjust the operating point. The EVOTRON will continue to operate in the set curve without intervention in such a situation.

In systems with thermostatic valves, so-called valve whistling can occur – it appears at excessively high differential pressure when most of the valves are closed. Here, proportional pressure or AutoAdapt regulation is key: the pump must reduce pressure, not maintain it. The EVOSTA2 with AutoAdapt does this automatically, the EVOTRON can also do it – if you have the proportional curve (Δp-v) correctly set. For details on faults and their solutions, see the article Common faults of DAB circulation pumps and their solutions.

Comparison of versions and when to choose which model – summary for practice

Based on dozens of customer cases we have handled from simple apartment renovations to large new builds with heat pumps, we can summarise the decision-making as follows:

Choose EVOTRON if:

you have a simple system without thermostatic valves (or only with manual valves)
you are working with a limited budget and the customer does not want to pay for extra features
it is a secondary circuit where AutoAdapt will not provide a measurable benefit
the system has a long, hydraulically balanced circuit with predictable flow
you do not need a backup power source or consumption indication

Choose EVOSTA2 if:

the system has thermostatic valves (which is the case in most new builds today)
you are working with a heat pump, where protection in the event of a power outage is important
the customer wants to monitor consumption and have an overview of the system's operation
it is a condensing boiler, where the correct pump operating point directly affects the efficiency of condensation
it is a renovation of an old system, where you want maximum flexibility without the need for manual tuning
the building has more than one floor or irregular hydraulic circuits

Most frequently asked questions (FAQ)

Can I replace the EVOTRON with the EVOSTA2 directly without other changes to the system?

Yes, both models have the same mounting dimensions (construction length 130 or 180 mm, DN 40 with G 1½" thread). If you have installed compatible flanges, the replacement is mechanically straightforward. The difference appears in the setting: after installation, the EVOSTA2 needs to be started in AutoAdapt mode and allowed to run for a few days so the system can automatically optimize the settings.

Is there a difference in noise between the EVOTRON and the EVOSTA2?

Not in the mechanics and hydraulics themselves – both are almost silent with proper installation and deaeration. The difference may arise in that the EVOSTA2 in AutoAdapt mode operates systematically at lower speeds and lower pressure – which indirectly reduces the noise generated by water flow in the pipes. In practice, this is a marginal difference; much more important is proper installation and system deaeration.

Does AutoAdapt work with underfloor heating?

AutoAdapt is primarily designed for systems where hydraulic resistance changes (i.e., thermostatic valves, radiators). In underfloor heating behind a thermostatic mixing valve, the circuit is relatively constant – AutoAdapt will work, but its benefit will be smaller than in a radiator system. For underfloor heating behind a mixing valve, the EVOTRON set to constant pressure or constant speed is more than sufficient.

What if I don't have standard flanges – can the DAB pump be connected to old threads?

The DAB EVOTRON and EVOSTA2 are standardly equipped with flanged connections G 1½". Using reducing flanges or adapters (commonly available in installation supplies), they can also be connected to G 2" or other sizes. Sets with flanges, as available in our online shop, already include ready-made mounting assemblies including ball valves with a bleed valve, which significantly speeds up installation.

What is the difference between the DAB VA35/130 and the EVOTRON/EVOSTA2 series?

The model DAB VA35/130 is a three-speed pump from an older generation – i.e., without a frequency inverter and without an EC motor. It operates on the principle of three fixed speeds, with a lower energy efficiency class (class B/C according to ErP). It is the most affordable option, suitable for very simple systems without thermostatic valves or for customers with minimal regulation requirements. Compared to the EVOTRON and EVOSTA2, it has significantly higher annual electricity consumption.

Is it worth buying the EVOSTA2 just for the display with consumption?

The display itself is not a sufficient reason to pay a premium if the system does not otherwise use the other features of the EVOSTA2. However, if the system has thermostatic valves, a condensing boiler, or a heat pump, AutoAdapt and the backup power supply are real benefits with practical impact. In such a case, the display with consumption is a pleasant bonus, not the primary reason for purchase. If you are unsure, consult your choice in the context of your specific system – we are happy to advise you.

Conclusion – practical verdict

In the end, neither pump is bad – both are reliable, both are class A, and both represent the current standard of circulation pumps for heating. The decision between the EVOTRON and the EVOSTA2 depends on the specific system, not on personal preferences or marketing slogans.

For a simple apartment with pipe radiators without thermostatic valves, where the customer wants reliability and long life at a reasonable price, the EVOTRON is ideal. For a modern family home with a condensing boiler, thermostatic valves on each radiator, and the goal of maximum energy efficiency – or for a system with a heat pump – the EVOSTA2 is the right choice, whose premium is genuinely returned in comfort, safety, and consumption.

If you are unsure which model is right for you, also see other articles in this Knowledge Centre – especially How to choose a DAB circulation pump for heating and Common questions about DAB pumps. Answers to most typical situations are discussed in detail there.

Do you have a question about this topic?

Can't decide or are you dealing with a specific situation in your home? Write to us – we are happy to advise you.