Cheaper, costs less to run

Disadvantages

Needs valves to connect to pipe work, must be protected from elements, not designed for the job

It is a fact that koi pond owners do use these, but they change the actual pump housing to a purpose made plastic version, so that is more cost.

As the pump is steel they will rust over time, which is why koi keepers change it. In its normal use that of central heating, the water is in a continuous loop, so it can be almost anywhere on the system.

But a water feature is NOT a closed system (air gets in at the feature) so in order for this to work you must have the pump lower than the sump, and as the sump is in the ground the circulator will need protection from the elements

So yes you can use one but for a water feature it is going to cost you more than a submersible pump will.

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