Espa Silen S2 pool filtration pump, main view on a white background
Bomba Espa Silen S2 (Antigua Silen 2) - Q-Tech ®
Bomba Espa Silen S2 (Antigua Silen 2) - Q-Tech ®

Espa Silen S2 ultra-quiet pool filtration pump, 0.75 to 3 HP

Model
Regular price€483,80
/
Tax included. Shipping calculated at checkout.

  • 3 in stock
  • Backordered, shipping soon

At Q-TECH, we apply the same clear rules for everyone: the law protects you, and when applied correctly, it protects us as well. By processing your purchase, you accept our General Terms and Conditions of Sale. If you are purchasing as a consumer (B2C), nothing stated herein limits the rights granted to you by mandatory law (RDL 1/2007, TRLGDCU): the 3-year legal warranty of conformity and the right of withdrawal under the terms and with the exceptions legally provided, which are detailed below. References to "B2B" apply only to businesses and professionals.

Your guarantees

  • Rights intact: 14 days of withdrawal from receipt for most products—subject to the legal exceptions you will see below, such as goods made to your specifications—and a 3-year legal warranty of conformity, under the terms of the TRLGDCU.
  • Conformity with the description: we guarantee that the equipment will correspond to the published technical description and what one could reasonably expect from it (arts. 115 et seq. TRLGDCU). Images and videos are for guidance only: the manufacturer may supply a more recent revision of the product or introduce minor aesthetic, packaging, or firmware changes, without this constituting a lack of conformity as long as the described characteristics and performance are maintained.
  • Traceability that also protects you: we document the condition, serial number, and seal of each piece of equipment upon shipment, and we video-record the opening of returns; this is your proof of the condition in which the goods were delivered.

Responsible use and your part

  • If you are thinking of returning it, keep it as you received it: without installing or activating it, with its seals, accessories, and packaging intact. This is how to ensure a full refund, without deductions.
  • Handling that exceeds inspection reduces value: handling the equipment beyond what is necessary to verify its nature and operation may result in a real, assessed, and case-by-case justified deduction (art. 108.2 TRLGDCU), never a fixed percentage. In particular: activating or registering the serial number, linking it to a manufacturer's account or app, circulating water through hydraulic equipment, unsealing probes, or installing software or consumables. Initial inspection of the product does not lead to a deduction.
  • The same item must be returned: withdrawal requires returning the supplied unit. Different equipment, or equipment with prior use, age, or wear prior to purchase, does not constitute a valid withdrawal.
  • Installation and cybersecurity, shared responsibility: this is technical hardware; you are responsible for correct installation, credentials, patches, and backups, while we deliver a compliant product. Q-TECH is not liable for damages resulting from poor installation, incorrect configuration, or omission of patches by the customer or third parties (in B2C, without prejudice to the legal warranty and liability for intent or negligence, arts. 86 and 130 TRLGDCU).
  • Delivery of bulky goods: delivery is made to the curb. B2C: transport risk is ours until physical delivery (art. 66 ter); we recommend noting visible damages on the delivery note and notifying us of breakages within 24-48 hours with photographs to activate the insurance. B2B: inspection and notation on the delivery note are mandatory; hidden damages must be reported within 24 hours (art. 366 CCom). Unjustified rejection or incorrect shipping information will entail the actual outbound and return costs (approx. €85-550 for heavy machinery).

Made to your measure (Advanced Pre-Assembly)

  • If your order includes equipment, racks, hydraulic assemblies, or technical rooms made or configured according to your specifications (permanent joints, custom cuts or wiring, parameterization, pressure testing), these are custom goods without the right of withdrawal from the conclusion of the contract (art. 103.c TRLGDCU; CJEU Case C-529/19), which is informed before purchasing and documented in the signed Order Note. A test you request without permanent modification retains your right of withdrawal, with only the actual loss of value caused by that test being deducted. Would you prefer to receive it tested, configured, and ready to connect, without assuming these risks? Contract our Advanced Pre-Assembly or the prior technical audit.

If you are purchasing as a business or professional (B2B)

  • The transaction is governed by the Commercial Code: firm sale, without the right of withdrawal; notification of defects within 4 days (apparent) / 30 days (hidden), arts. 336 and 342. Q-TECH acts as a distributor and excludes indirect damages, loss of profit, and data loss, limited to the price of the equipment, without prejudice to the manufacturer's commercial warranty.

Product warnings v1.0 · June 2026. Information summary; the complete and binding conditions are those published at q-tech.es.

You may also be interested in...

Ultra-quiet filtration pump for pools from 18 to 36 m³ per hour

The Espa Silen S2 is the self-priming pump with pre-filter that Q-Tech fits in its pool plant rooms when the equipment has to be as quiet as possible. The range covers five sizes, from 0.75 to 3 HP, in single-phase and three-phase versions, and it reaches site tested and configured inside the plant room.

Summary

TypeSingle-stage self-priming centrifugal pump with pre-filter
Brand and rangeEspa Silen S2, replaces the Silen 2
UseWater recirculation and filtration in domestic and public pools
Flow rate18 to 36 m³ per hour depending on the model
Maximum head13.2 to 21.5 m
Compatible withChlorinated and salt water up to 7 g per litre, up to 40 °C
Power supply230 V single-phase or 230 and 400 V three-phase
Q-Tech installationPre-assembled plant room or on-site day rate

What is the Silen S2?

The Espa Silen S2 is a single-stage self-priming centrifugal pump for pool recirculation that lifts water from up to 4 metres below its shaft. The two-pole asynchronous motor runs in continuous duty. It is installed next to the filter, in a plant room or a ventilated housing.

What problem does it solve?

In a correctly sized pool the whole body of water passes through the filter several times a day, and the pump is the only thing you hear during those hours. A noisy pump a few metres from the terrace dictates when you can filter, and filtering too little shows up as cloudy water and extra chemicals.

Choosing the wrong size costs just as much. An undersized pump never overcomes the filter's pressure loss and the system never reaches its design flow; an oversized one pulls sand out of the filter, uses more power and punishes the mechanical seal. The head of the installation matters as much as the volume of the pool.

Technical data

Pump body, impeller and diffuserTechnopolymer
ShaftAISI 431 stainless steel
Mechanical sealAlumina and graphite
Motor casingAluminium
SealsNBR and EPDM
MotorAsynchronous, two poles, class F, continuous duty, automatic reset
ProtectionIPX5, with built-in thermal protection
Connections63 mm suction and discharge, solvent weld
Maximum suction lift4 m
Operating limitsWater up to 40 °C and 7 g per litre of salt
Dimensions624 by 272 by 219 mm
EquipmentUnions included; supplied without cable

Models and data by variant

ModelPowerMaximum flowMaximum headPower supplyPart numberEAN
Silen S2 75 18 M0.55 kW · 0.75 HP18 m³ per hour13.2 m230 V single-phase2031558421535149569
Silen S2 75 18 T0.55 kW · 0.75 HP18 m³ per hour13.2 m230 and 400 V three-phase2031608421535149613
Silen S2 100 24 M0.90 kW · 1.2 HP24 m³ per hour16.5 m230 V single-phase2031568421535149576
Silen S2 100 24 T0.90 kW · 1.2 HP24 m³ per hour16.5 m230 and 400 V three-phase2031618421535149620
Silen S2 150 29 M1.10 kW · 1.5 HP29 m³ per hour18.5 m230 V single-phase2031578421535149583
Silen S2 150 29 T1.10 kW · 1.5 HP29 m³ per hour18.5 m230 and 400 V three-phase2031628421535149637
Silen S2 200 31 M1.50 kW · 2 HP31 m³ per hour19.5 m230 V single-phase2031588421535149590
Silen S2 200 31 T1.50 kW · 2 HP31 m³ per hour19.5 m230 and 400 V three-phase2031638421535149644
Silen S2 300 36 M2.20 kW · 3 HP36 m³ per hour21.5 m230 V single-phase2031598421535149606
Silen S2 300 36 T2.20 kW · 3 HP36 m³ per hour21.5 m230 and 400 V three-phase2031648421535149651

Compatibility and limits

  • 63 mm solvent weld pipework on suction and discharge; the unions are included.
  • Suction up to 4 m below the pump shaft.
  • Chlorinated water or salt chlorination up to 7 g per litre. For seawater, the Noxsalt range.
  • Water temperature up to 40 °C.
  • Three-phase versions need thermal protection in the control panel; the pump is supplied without a cable.

When this product is not the right choice

AlternativeWhen to choose itFlow rateConnection
Espa Silen SSmall and medium pools12 to 22 m³ per hour63 mm with 50 mm reducer
Espa NoxPlusWhen you want to cut running costs with variable speedAdjustable50 mm
Espa NoxSaltSeawater or salinity above 7 g per litre15 to 22 m³ per hour50 mm

Frequently asked questions

Which model do I need?

The one that delivers your design flow against the real head of your installation, not the one with the most horsepower. The pool volume divided by the filtration hours gives the minimum flow, and the filter and pipework give the head.

Does it replace the Silen 2?

Yes. The Silen S2 is the current version of the Espa Silen 2, with new materials.

Does it work in a salt water pool?

Yes, up to 7 grams per litre, which is the normal range for salt chlorination. Above that figure, the Noxsalt range.

Does it come with a cable?

No. Espa supplies it without a cable: the electrical connection and its protection are made in the control panel.

What is the delivery time?

This item is in stock at our warehouse.

Can I install it myself?

The hydraulic side is straightforward if the pipework is 63 mm, but the electrical connection and the filtration timing are better left to a technician. Q-Tech does this on-site or delivers the pre-assembled plant room.

Q-Tech installation and support

Q-Tech fits the pump inside the pre-assembled plant room: it is wired, configured and tested at our workshop, and reaches site ready to connect, with fewer site visits and fewer incidents for the developer, the design team and the installer. The final connection is made by the site installer or by Q-Tech. If the pump goes into an existing installation, book the verification visit first; for one-off questions, the technical call.

Documentation

Espa Pool 2026 catalogue, with curves and dimensions for the Silen S2 range

Availability and lead times: this item is in stock at our warehouse. Occasionally, depending on the time of year, the stock update may contain an error. If no units are available when you place your order, we will order it urgently and inform you immediately of the updated delivery time.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.