Two quotes land on your desk: a pump at €400 and a comparable unit at €700. Choosing the cheaper feels like saving €300. It usually saves nothing, and the arithmetic takes a minute to check.
The three costs nobody prints on the box
Energy. A pump running a few hours a day consumes its own price in electricity every year or two. An efficiency gap of a few percentage points, invisible at purchase, quietly exceeds the price difference before the second summer.
Failure. A premature failure costs a call-out, a replacement, and the downtime in between. In a farm or a hotel the downtime is the most expensive part, and it is the cost the cheap pump is statistically most likely to deliver.
Replacement. If the cheap unit lasts five years and the better one lasts fifteen, you did not save €300; you bought the same pump twice and paid for the second installation.
The honest comparison
Add purchase price, expected energy over the service life, and one realistic failure-and-replacement on the budget option. In nearly every worked example we do with customers, the numbers cross inside three to five years. Beyond that point the "expensive" pump is the cheaper one, and keeps getting cheaper every season it runs.
Buy on the invoice and you pay twice. Buy on the decade and you pay once.