ESPA Pumps ESPA I Silen, Nox and Noxsalt model catalog

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ESPA is one of the leading brands in pool pumps and hydraulics in general, known for the reliability of its motors, the durability of its materials and its compatibility with salt chlorination systems.

Its great advantage over other brands is that it designs and manufactures all the components of its pumps at its plant in Banyoles (Spain), which guarantees exhaustive quality control and superior performance even after years of intensive use.

In Pool Comet you will find the best ESPA Pumps catalog, from compact models for small pools to high power equipment for medium and community installations.

Included are the Silen I, Silen S, Silen S2, Nox and NoxSalt series, with clear explanations to help you choose the model that best suits your pool.

ESPA Silen pump catalog Silen

The ESPA Silen pump series is one of the most recognized pumps in Europe thanks to its durability and low maintenance.

They are self-priming pumps , self-priming, quiet operation and salt chlorination compatible. In addition, they share dimensions with many older ESPA pumps, allowing them to be replaced without modifying the installation.

ESPA Silen I Pumps ESPA Silen I

The ESPA Silen I series of pumps is ideal for pool owners looking for a reliable, economical model that is compatible with older ESPA Iris and AstralPool Sena models. It is perfect for small and medium-sized pools, with good hydraulics and a reinforced motor.

Its models are:

SILEN I 33 8 M – 0,33HP

Compact model ideal for small pools or spas. Compatible with Iris 500M. Very low energy saving and easy maintenance.

SILEN I 50 12 M – 0,5CV

Good choice for small/medium pools with short return and low pressure drop. Replaces Iris 750M and installs without adjustments.

SILEN I 100 15 M – 1CV

Robust model for pools up to 80 m³ with standard circulation. Compatible with older Iris 1000M and Silen I.

ESPA Silen S Pumps

The Silen S pump series is the natural evolution of the historical Silen range. They share dimensions with the older Silen 75M, 100M and 150M models, but incorporate improvements in efficiency, materials and performance.

This range is ideal for medium to large pools with more demanding filtration systems. The list of models is as follows:

ESPA Silen S 60 12M

Compact version for small pools, compatible with ESPA Silen 50.

ESPA Silen S 75 15M

Balanced power for medium-sized pools. Ideal as a direct replacement for Silen 75M.

ESPA Silen S 100 18M

Excellent performance for 60-80 m³ pools. Replaces Silen 100M while maintaining dimensions.

ESPA Silen S 150 22M

Powerful model for large pools or pools with a long circuit. Replaces Silen 150M without modifying piping.

ESPA Silen S2 ESPA Silen Pumps

The Silen S2 is ESPA’s most advanced pump, standing out for:

Huge high capacity prefilter.
Optimized hydraulics.
Reinforced components.
Quiet operation.
Resistance to 12 bar in test bench.

It is the ideal choice for those seeking maximum performance and durability, even in demanding installations.

Its list of single-phase 230V models is as follows:

SILEN S2 75 18M 230 50 014694/STD
SILEN S2 100 24M 230 50 014694/STD
SILEN S2 150 29M 230 50 014694/STD
SILEN S2 200 31M 230 50 014694/STD
SILEN S2 300 36M 230 50 014694/STD

Its list of three-phase 230/400V models:

SILEN S2 75 18 230/400 50 014694/STD
SILEN S2 100 24 230/400 50 014694/STD
SILEN S2 150 29 230/400 50 014694/STD
SILEN S2 200 31 230/400 50 014694/STD
SILEN S2 300 36 230/400 50 014694/STD

ESPA Nox Pump Catalogue

The ESPA Nox pump series is the modern and economical evolution of the older Silen and Iris models.

They stand out for their silent motor, AISI 316 stainless steel shaft and total compatibility with salt chlorination.

These pumps are ideal for pools up to 80 m³, with easy installation and reduced maintenance.

The list of models includes:

Nox 50

For small to medium size pools, direct replacement for Iris 750 and Silen I 50.

Nox 75

Perfect for medium size pools. Replaces Silen 75M without modifying the installation.

Nox 100

Grana performance for 60-80 m³ pools. Modern alternative to Silen 100M.

Nox 150

For large pools or demanding installations. Replaces Silen 150M.

ESPA Noxsalt Pumps Catalog

The ESPA NoxSalt range of pumps is specifically designed for seawater up to 40 g/l, ideal in coastal areas or in pools that are filled with seawater.

Included are reinforced anti-corrosion materials, duplex shaft, high salinity resistant o-rings and special motor seals. Its models are:

NoxSalt 75

For small/medium pools with sea water or high salinity.

NoxSalt 100

For medium pools with high salinity. Replaces Silen S 100M.

NoxSalt 150

For large pools or systems exposed to seawater. Compatible with Silen 150M.

Frequently Asked Questions about ESPA pumps

Do you have questions you need to answer before buying a pool pump? Here are the most important ones:

How do I know which pump I need for my pool?

To choose the right pump you should mainly consider the volume of the pool (m³), the required power (HP), the pressure gauge head and the pressure losses of the circuit.

As a general rule, the pump should be able to filter the entire volume of water in a maximum of 6 hours. Models such as ESPA Silen S, Silen I or Nox are available in power ratings ranging from small pools to installations of more than 100 m³.

If you are unsure, use our Variable speed pool pump calculator.

How much does an ESPA pool pump consume?

It depends on the model and power, but, in general, the consumptions are:

0.5 HP: between 450 and 550 W
0.75 HP: about 550-750 W
1 HP: between 850-1,000 W
1.5 HP: between 1,200-1,500 W

Modern ranges such as Silen S2 or Nox are more efficient and consume less energy due to optimized hydraulics and high performance motors. To know the actual monthly cost, multiply the consumption in kW by the hours of operation per day (usually 6-8 h).

What are the most common problems with an ESPA pool pump?

The most common are:

The pump does not suck (there is usually air in the circuit).
Pump starts and stops (thermal overheat protection).
Pump leaks water (prefilter o-ring or motor seal).
Excessive noise (worn bearing or clogged turbine).
Pump does not start (condenser or internal blockage).

These problems are common in very old or poorly maintained pumps. If faults recur or the motor “runs out of power”, it is time to consider replacement.

When should I replace an ESPA pump with a new one?

We recommend replacing the pump when:

It is more than 8-10 years old and its performance has declined.
Recurrent failures (leaks, blockages, overheating).
It consumes a lot of electricity compared to current models.
It does not meet the required liters/hour for your pool.
You switch to a more demanding filtration system (such as a larger filter).

In these cases, modern models such as ESPA Silen S2, ESPA Nox or NoxSalt (if you use salt or sea water) offer superior performance with lower consumption.

How to install an ESPA pool pump?

The installation is simple and follows this scheme: Skimmer – Pump – Filter – Return

The pump must be placed:

At or below water level (preferred)
As close as possible to the filter
With a stable base and adequate ventilation

It is essential:

Correctly connect inlet and outlet with fittings or unions.
Ensure the sealing of the prefilter.
Verify the electrical connection according to the voltage of the model (230V single-phase or 230/400V three-phase).

How to maintain an ESPA pool pump in good condition?

Basic maintenance includes:

Clean the prefilter basket regularly.
Check that there are no leaks in the cover or joints.
Maintain balanced pH and salinity (if using salt chlorination).
Prevent the pump from running without water (cavitation).
Clean turbine and prefilter if flow rate drops.
Check the motor ventilation to avoid overheating.

The modern ESPA ranges(Silen S, S2, Nox) require very little maintenance thanks to their anti-corrosion materials and protected motors.

What are the differences between ESPA Silen I, Silen S and Silen S2?

Silen I. Compact and economical. Perfect to replace old Iris and Silen without modifying the installation.
Silen S. More powerful, Quiet operation and efficient. Ideal for medium size pools.
Silen S2. High performance premium range, high capacity prefilter and reinforced materials. Designed for demanding installations.

What is the difference between ESPA Nox and ESPA NoxSalt?

Nox. Modern, efficient, quiet operation and salt chlorination compatible.
NoxSalt. Reinforced version for seawater and high salt concentrations (up to 40 g/l). Included shaft and special anti-corrosion motor seals.

Which ESPA pump is best for small pools (up to 30-40 m³)?

The most recommended pumps are compact, quiet operation and energy saving:

Which ESPA pump to choose for medium-sized pools (40-80 m³)?

The best options, since they have a higher flow rate and better performance in head losses, are:

Which ESPA pump is ideal for large pools or demanding installation?

We recommend, as they are high performance pumps, perfect for long circuits, large filters and community pools:

Are ESPA pumps compatible with salt chlorinators?

Yes. All ESPA Silen, Silen S, Silen S2 and Nox ranges are designed to work with salt chlorination systems. If you have seawater, you should choose ESPA NoxSalt.

Are ESPA pumps Quiet operation?

Yes. The ESPA Silen, Silen S and, especially, Silen S2 models are among the quietest pumps on the market thanks to their optimized hydraulic design and advanced ventilated motor.