HVACopediaRinnai · Tankless water heater · Pump/purge
Smart-Circ recirculation
What happens, in order
- Smart-Circ is the factory default recirculation mode on pump models
- First 24 hours unit learns when hot water is used; pump runs per setting 17 (17A = off, 17b = runs several times that day)
- On following days the pump runs ahead of the learned usage times to shorten the wait for hot water
- If a timer controller (MC-195T-US) or RWM200 wireless module is installed, Smart-Circ is disabled and the fixed schedule is used
- With a BLE push button (RPB200) installed: setting 18A disables Smart-Circ, 18b lets both work together
- Pump speed is set by parameter 16 (A is max and gives the shortest recirc time; b, C, d are quieter)
Timings and thresholds
| Item | Value |
|---|---|
| Learning period | first 24 h |
| Setting 17 default | per setting table |
| BLE buttons supported | up to 5 |
Codes you may see during this
Applies to: Rinnai RXP pump models
Models
More Rinnai tankless water heater sequences
- Circ-Logic external recirculation pump · Pump/purge
- Built-in freeze protection and power loss · Freeze protection
Related
Rinnai error codes · Rinnai tips · Rinnai parts · All Rinnai sequences
Take it to the job
Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Rinnai SENSEI RX Installation and Operation Manual (100000839), recirculation and parameter sections. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.