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Booster Pump Sizing Tool

An undersized pump is the most common reason a "new" booster pump still doesn't fix weak pressure. Get a general sizing estimate based on your property, before you buy anything.

Select your property details and click the button to see your estimate

This is a general estimate based on floors and fixture count alone. Actual sizing also depends on pipe diameter, supply pressure at the tank, and real simultaneous-use patterns, which is why we confirm with an on-site assessment before any installation.

Why Sizing Is the Part Most People Get Wrong

An undersized booster pump is the single most common cause of a "new pump that still doesn't fix the problem" complaint. It's an easy mistake to make, because the symptom, weak pressure at the top floor or when two fixtures run at once, looks identical to a genuine repair issue. The difference matters: repairing a pump that was never sized correctly for the property just restores it to being correctly-functioning and still undersized.

The real calculation behind a proper installation weighs head height (how far the pump has to push water vertically), realistic simultaneous demand (not how many fixtures exist, but how many could plausibly run at once), and the actual flow rate needed. This tool gives a general starting tier based on floors and bathroom count, the two easiest inputs to estimate from home, but an on-site assessment is what confirms the real number before anything gets installed.

Common Questions

How accurate is this estimate really?

It gives you the right tier for a typical property matching your floors and bathroom count, based on the same sizing table we use for actual installations. Real sizing also depends on pipe diameter and supply pressure, which is why an on-site assessment confirms the exact HP before any purchase.

Why can't apartment buildings just use the villa calculator?

A shared building supply has to serve many units drawing simultaneously, an entirely different demand profile from a single villa. It needs a proper engineered multi-pump system sized to the whole building, not a residential unit sized for one household.

What if I'm right at the boundary between two tiers?

That's exactly the situation where a real site visit earns its keep, borderline cases are where sizing mistakes most often happen, and the cost of getting it wrong (weak pressure on one end, an oversized pump wearing out faster on the other) is higher than the cost of a proper assessment.

Does this replace an actual site assessment?

No, and it's not meant to. It's a starting point so you know roughly what tier to expect and can budget accordingly before anyone visits, not a substitute for measuring your actual property.

My current pump matches this size, but I still have weak pressure. What's going on?

If sizing isn't the issue, the fault is more likely a specific failed component, a pressure switch, a worn impeller, or a waterlogged pressure tank, not a sizing problem at all. Our booster pump repair page covers real diagnosis for exactly this situation.

Want a Real Assessment, Not Just an Estimate?

We measure head height, supply pressure, and actual demand on-site before recommending a specific pump.

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