ESPA Silenplus Pump Replacement Parts

For the most part, yes, but not all of them.

Compatible parts between SilenPlus, Silen S, and NOX 75/100/150:

• Pre-filter basket
• Pre-filter cover (models from 2007 onward)
• Pre-filter O-ring
• Pre-filter cover nut

Parts NOT compatible (specific to each model range and power rating):

• Impellers
• Mechanical seal
• Hydraulic housing

Always check the product data sheet for the list of declared compatibilities before ordering. If you have any questions, contact our technical support team.

The power rating and exact model are indicated on the pump's nameplate, which is usually located on the side of the motor.

Information you should note down before ordering turbine or mechanical seal replacement parts:

• Power: in CV or W (kilowatts)
• Frequency: 50 Hz (Europe) or 60 Hz (some markets)
• Type: single-phase (230 V) or three-phase (400 V)
• Exact model: SilenPlus 1M, 2M, or 3M

Quick conversion (1 CV = 0.736 kW):

• 0.55 kW ≈ 0.75 CV
• 0.80 kW ≈ 1.1 CV
• 1.10 kW ≈ 1.5 CV

With this information, the replacement part can be identified without error. Send it to us via the contact form if you need confirmation.

That is the area of the mechanical seal. The mechanical seal prevents water from passing from the hydraulic housing to the motor.

When it fails, water leaks out from the bottom of the volute, between the housing and the motor. This is the most common failure in pumps that have been in service for several years.

Replacement:

• Requires completely disassembling the pump: housing, diffuser, impeller
• Align the new seal correctly
• Reassemble without damaging the gaskets

Recommendation: If you have no prior experience with centrifugal pump mechanics, contact our technical support before attempting the repair. Incorrect assembly can damage the new seal within a few hours.

In a residential installation under typical use (8 hours a day, 6 months a year), the estimated service life is 5–8 years.

Factors that extend the valve’s service life:

• Keep the basket clean at all times (prevents cavitation)
• Pre-filter gaskets in good condition (prevents air from entering)
• Avoid prolonged downtime (continuous starting and stopping is not good for the unit)

Factors that shorten the lifespan:

• Running the machine dry, even for just a few seconds
• Cavitation due to a clogged basket
• Water pH significantly outside the range (7.2–7.6)
• Inlet of very hard, untreated water

Preventive replacement after 5–6 years in facilities where a breakdown during peak season results in high operating costs (vacation rentals, homeowners’ associations, etc.).

Yes, ESPA continues to manufacture most of the replacement parts for the SilenPlus line for two reasons:

• Compatibility with the Silen S and NOX 75/100/150 models means that many parts continue to be manufactured “de facto” for those current product lines
• The installed base of SilenPlus units in España remains extensive, and the brand is committed to providing long-term support

Specific exceptions:

• Some very old versions (prior to 2007) have slightly different covers and gaskets
• Always check the model year before ordering the pre-filter cover and O-ring

If your pump is from before 2007, contact our technical support to verify compatibility before purchasing.

Technically possible, but rarely worth the effort.

The motor and hydraulic unit of the SilenPlus are factory-matched in terms of shaft dimensions, power output, and alignment.

Situations where it IS worth it:

• A practically new motor with isolated housing damage (water hammer, ice)
• The specific housing is readily available

Situations where it is NOT worth it:

• Motor with several years of service: if you replace the housing, the motor may fail within 1–2 years, and you will have spent money on a hydraulic housing that you will no longer be able to use
• The total cost of the parts to be replaced exceeds 60–70% of the price of a new pump

In most cases involving motors with 6+ years of service, a complete replacement with a current Silen S Espa pump is more cost-effective than replacing major components.

The standard SilenPlus is compatible with residential salt chlorinator systems (4–6 g/l), but it is advisable to follow the same best practices as with any pool pump used in saltwater:

• Install a Pool Terre-type water grounding system (€109–139) to neutralize stray currents between submerged metal components
• Inspect seals at the start of each season
• Monitor fasteners and external metal components more closely (as they are prone to atmospheric corrosion in coastal areas)

For the complete catalog of compatible electrolysis systems, see the salt chlorinators from the 11 brands listed in the catalog at Quimipool.

It depends on the application. The SilenPlus is a fixed-speed pump: it always operates at the same speed (the speed provided by the motor at 50 Hz).

Switching to a variable-speed pump is worthwhile when:

• Pools with extended filtration: 10–14 hours per day with a salt chlorinator or intensive use
• Areas with high electricity costs
• Large pools where the savings pay for themselves in 2–3 seasons

It is NOT worth switching if:

• The SilenPlus is working well and only requires routine maintenance
• The pool is used 6 hours a day or less
• Electricity costs are under control

Best practice: Use the SilenPlus until the end of its service life with proper maintenance, and when it’s time to replace it, consider a variable-speed pump to reduce your electricity bill.

At Quimipool, you'll find the complete catalog of pool filter replacement parts, featuring the original ESPA part numbers for the SilenPlus:

• Pre-filter basket
• Pre-filter cover (models from 2007 onward)
• Pre-filter O-ring
• Pre-filter cover nut
• Connection O-ring
• Model-specific impellers (1M · 2M · 3M)
• Mechanical seal
• 50 mm connection fitting

Before ordering any parts:

• Note the exact model (SilenPlus 1M, 2M, or 3M)
• Check the power rating and frequency on the motor nameplate (for turbines and mechanical seal)
• Check the year of manufacture (important for the pre-filter cover)
• Contact our technical support team or use the contact form if you have any questions

Fast shipping to mainland Spain on orders over €150, with shipping included.