Constant-pressure systems
Variable-speed systems that hold steady water pressure instead of cycling between a cut-in and cut-out. Rows are complete systems or drive-and-pump combinations, as each maker sells them.
Data last checked: · What changed
Price rule: Price = lowest in-stock price for a new unit of that exact model seen on a public US retailer or manufacturer-store listing (seller named and linked), checked on the date shown. No affiliate links. If no live price was found, a $ band is shown as an editorial estimate. Editorial estimate (no live price seen): $ under $250 · $$ $250–$600 · $$$ $600–$1,200 · $$$$ $1,200–$2,500 · $$$$$ over $2,500. Blank cells show “—” (not published / not found). Curve and data-sheet links go to the maker’s official page; curves are not reproduced here.
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How to read this chart
- Tick Compare on up to 4 rows (across any catalog), then open Compare to see them side by side.
- Click a column heading to sort; rows with no value for that column always sort last.
- Not sure what size you need? Start with sizing basics.
Sources and limits
Facts come from official manufacturer pages and catalog PDFs, plus public retailer listings. Each row links its sources. Notes are written in our own words. Nothing is guessed: a missing number means it was not published or not found. Data last checked Nov 15, 2026.
Independence
No ads, no affiliate links, no tracking parameters. Every link goes straight to the manufacturer or retailer page it names.