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New Recirculating Pump for Rinnai rl94i tankless water heater

Can anyone suggest a good recirculating pump for a Rinnai rl94i tankless water heater? The previous homeowner put a Grundfos UP15-10SU7P TLC, Comfort Hot Water Recirculation Pump, 3/4" NPT, 115 V on there but the plumber who looked at it said that it is not the correct pump. Any suggestions?