Replacement evidence
BecSpec distinguishes explicit manufacturer succession from inferred similarity.
How matching works →Rainwater replacements · Onga / Pentair
What replaces an Onga WaterSwitch MkII?
Onga literature states that the iWaterSwitch is fully interchangeable with the MkII WaterSwitch. That is unusually strong manufacturer evidence for the controller relationship.
What “interchangeable” does and does not mean
It supports the controller succession relationship. It does not establish that every pump, plumbing arrangement, electrical connection or rainwater installation is suitable without checking the actual system.
Before replacement
Confirm the nameplate is WaterSwitch MkII, identify the connected pump/system configuration and verify the current installation requirements rather than relying on the controller name alone.
Known limits
This is not hydraulic sizing, fault diagnosis or installation approval.
Read the limitations →