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Flow is what the site must deliver with the outlets you expect to run at the same time. Head is the lift, plus pipe friction, plus the pressure the outlet needs. Read both figures off the model tables and you land in one of the boosting levels used as a catalog filter: Level 1 covers up to 45 m head and up to 105 L/min, Level 2 reaches 46 to 60 m head for multi-storey villas, and Level 3 delivers up to 500 L/min for large properties with several outlet groups.

The water source changes the installation rather than the size. A booster fed from a rooftop tank or a cistern works on suction lift, so keep the suction pipe short, fit a strainer and a non-return valve, and use dry-run protection for the moments the tank runs low. A booster on a pressurised mains line works on inlet pressure. Both routes draw on the same model shortlists listed above.

The DC range is the separate pipeline boosting indicator. It covers pipe boosting duty rather than whole-house duty: hot water areas, taps and fixtures, and RV or caravan water lines, with automatic start and stop on a 24 V supply.