The hidden cost of outdated systems: when a working electropump stops being cost-effective

In the water supply sector, there is an invisible trap that weighs more than one might think on the balance sheets of companies and end users: the apparent peace of mind of an outdated, yet still functioning system.
An electropump that, despite being obsolete, continues to do its job, hides a major structural inefficiency problem. Even if the machine works, it absorbs significantly more energy than necessary, turning presumed reliability into a hidden cost that erodes margins month after month.

Capex and TCO: how to understand if an electropump is sustainable

The most common strategic mistake made by owners of outdated systems is thinking solely about Capex, i.e., the investment required for an efficiency upgrade with a new electropump.
In operational reality, it is the least significant item.

The core parameter for assessing system sustainability is the Total Cost of Ownership (TCO), which combines:

• purchase cost of the electropump;
• electricity consumption over time (Opex);
• routine and extraordinary maintenance costs;
• indirect cost of downtime.

For installations subject to intensive work cycles, the electricity bill quickly becomes the dominant expense item. A unit kept in operation beyond its maximum efficiency cycle ends up costing much more than an immediate technological upgrade.

How to calculate the return on investment of an electropump

To understand when it is convenient to decommission a still-functioning electropump, it is necessary to move from an rough estimate to an analytical calculation. Three metrics are enough:

• Annual energy cost = [Actual power absorbed] × [Operating hours] × [Unit energy cost]
• Potential annual savings = [Current energy cost] - [Estimated energy cost of the new unit]
• Payback Period (Return on investment) = [Replacement cost] / [Annual savings]

Applying this formula to actual plant data, the payback period for purchasing a new high-efficiency electropump is often very short, entirely covered by electricity bill savings.

Efficiency is a system matter, not just a motor one

Evaluating efficiency by looking only at motor data is misleading. An oversized or undersized unit, or one operating far from its best efficiency point, wastes energy to guarantee suboptimal performance. In these cases, the system is not just pumping water; it is wasting economic resources.

The impact of materials on consumption: the advantage of precision cast stainless steel

There is also a technical detail that makes a difference on energy bills: the material engineering of the hydraulic part. Efficiency is closely linked to minimizing internal friction.

It is on this front that FB developed the FBSX series, whose hydraulic parts are made entirely of precision cast stainless steel (in AISI 304, AISI 316, and AISI 904L variants). From a hydrodynamic standpoint, investment casting guarantees internal surfaces with minimal roughness.
Compared to traditional cast iron casting, the smoothness of investment cast steel facilitates flow, reducing head losses. Thus, for the same flow rate and head, hydraulic resistance drops dramatically, bringing a clear reduction in electrical power consumption.

Changing logistical paradigm

Replacing an electropump is not a pure replacement expense, but an industrial efficiency investment. The key question for professionals is not "How much does the new electropump cost?", but rather "How much does it cost to keep the current one running?".

In this perspective, FB acts as a technological partner to support water sector professionals in this efficiency transition. To analyze data and size the most suitable solution, the Pump Selector on fbpompe.com allows cross-referencing application variables and technical parameters, identifying the best asset to optimize well operating costs.