ESPA Silen pump spare parts

Replacement Parts for the Silen Espa: Complete Parts List for Models 50M, 75M, and 100M

The SilenEspa is the classic filtration pump from ESPA (Electrobombas Sumergibles Pardo, Banyoles, Girona), installed in tens of thousands of residential swimming pools in Spain for over two decades. It was primarily marketed in the single-phase versions Silen 50M (0.5 CV), Silen 75M (0.75 CV), and Silen 100M (1 CV), with higher-capacity versions such as the 150M (1.5 CV) for larger pools. The model designation is easy to understand: the number indicates the power in hundredths of a CV, and the “M” indicates that the motor is single-phase (230 V).

Although the classic Silen was succeeded by the Silen S and Silen S2 series, the installed base remains enormous, and all wear-and-tear replacement parts are still available: from pre-filter consumables (basket, lid, gaskets) to motor parts (capacitor, starter, fan), including the mechanical seal and the impeller. An important detail for older pumps: several pre-filter parts come in both an older and a newer version (the design change occurred in 2007), so be sure to identify your pump’s year of manufacture before ordering.

On this page, you’ll find the complete exploded view of the Silen “ Espa,” organized by pump section: pre-filter, hydraulic housing, motor electrical components, and connections. See also the general section on pump replacement parts at Espa, the catalog of current pumps at Espa, or contact our technical support if you need to identify a part based on your pump’s nameplate.

Related categories: Espa pump replacement parts · Swimming pool pump replacement parts · Espa pumps · Espa SilenPlus replacement parts · Pre-filters for pumps · Swimming pool filtration systems

Espa Silen: Pump Specifications and Models

Espa Breakdown: Silen Spare Parts by Section

The parts list is organized into four sections based on the pump’s physical structure. Each part links to its product page with the current price.

Zone 1 — Prefilter: High-Turnover Consumables

Zone 2 — Hydraulic Assembly: Impeller, Diffuser, and Mechanical Seal

Zone 3 — Motor and Electrical Components: Capacitor, Buzzer, and Ventilation

This section is what sets this parts breakdown apart from other pumps: the classic Silen has accessible electrical parts that resolve the most common startup issues for very little money.

Zone 4 — Connections and Base

Older Silen Pumps: Pre- and Post-2007 Versions

If your Silen is quite old, this is the detail that most often leads to ordering errors. In 2007, ESPA changed the design of the prefilter for the series, and since then, two versions of two key parts have coexisted:

• Prefilter cover: the old version (pumps manufactured before 2007) and the new version (since 2007) are not interchangeable
• Pre-filter O-ring: Same issue— the old and new versions have different diameters

How to know which one you need if you don’t know the exact year of your pump: compare the shape of your current cover with the photos on both product pages, or send a photo of the cover and the nameplate via the contact form, and we’ll confirm the version for you with no obligation. The rest of the parts (impeller, mechanical seal from 2007 onward, capacitors, horn) are standard or identified by power rating, not by year.

Troubleshooting the Silen " Espa "

Preventive maintenance for the Silen Espa

• Cleaning the basket: Empty and clean the pre-filter basket every 1–2 weeks during the season. A clogged basket causes cavitation and shortens the life of the turbine and mechanical seal
• Seal inspection at the start of the season: Inspect the pre-filter seals before the first startup. A flattened seal causes priming loss from day one
• Seal lubrication: Apply a specific silicone lubricant when installing O-rings. Never use petroleum-based oils
• Winterization: Drain the water by opening the drain plug at the end of the season. Ice breaks hydraulic components every winter
• Never run the pump dry: the mechanical seal is lubricated by the water itself and will be destroyed in seconds if run dry
• Monitor motor ventilation: In enclosed sheds and during hot summers, a broken fan or a blocked cover will trigger the overheat alarm

Compatibility: Silen, Silen S, NOX, and SilenPlus

The classic Silen line shares some parts with other ESPA families, ensuring long-term availability:

• Parts shared with Silen S and NOX: pre-filter elements, pump base, Silenblocks, and mounting bracket. The catalog itself reflects this: several product sheets apply to both ranges
• Power-specific parts: the impeller, diffuser, and condenser are selected based on your model’s CV (50M, 75M, or 100M), not the product line
• SilenPlus: This is a separate product family (1M, 2M, and 3M versions) with its own parts list. If your pump is a SilenPlus, check the spare parts at Espa SilenPlus

If you’re considering a complete replacement due to motor failure, the current line of Espa pumps (Silen S and Silen S2) is the direct successor with equivalent dimensions and connections. For other brands in the catalog, check out pool pumps or consider a variable-speed pump if your pool runs its filter for many hours a day.

Can’t find the replacement part for your Espa Silen? Our technical team can identify the exact part based on the official ESPA exploded view diagram or the symptoms you describe. Call us at 91 128 55 90 or contact us via the contact form by sending a photo of the nameplate (and of the pre-filter cover if your pump is an older model, to distinguish between versions before and after 2007): With these two pieces of information, we can confirm the correct part number right away. See also spare parts for Espa pumps, pool pump spare parts, Espa pumps, and Espa SilenPlus spare parts.