Editorial standards

• Accuracy first: every specification comes from the maker's or seller's published information.
• Flow and head figures are the maker's own; calculator results show their assumptions (pipe size, fittings, friction).
• No electrical or code advice beyond what the maker's instructions say; installation that needs a licensed plumber or electrician is labelled as such.
• Backup runtimes are quoted as the maker states them, with the battery size they assume.
• Discontinued products are removed or clearly labelled, never recommended.
• Commissions never decide which products we cover or how we rank them.

Corrections

If you spot an error, email [email protected]. We correct the source record, then every page that uses it.

Updated October 2026.