United Spa Controls CR117S Review
The United Spa Controls CR117S is a remote-heater spa control system designed for hot tubs where the heater is plumbed separately from the control box. If your spa uses a remote heater configuration — or if a previous CB117P installation caused repeated flow errors — the CR117S is likely the correct replacement system.
This review covers CR117S specs, compatibility requirements, how it compares to the CB117P, and who should choose it.
What Is the United Spa Controls CR117S?
The United Spa Controls CR117S is part of the same product family as the C6 and CB117P, but it uses a fundamentally different heater configuration.
While the CB117P integrates the heater directly into the bottom of the control box, the CR117S is designed to work with a remote heater — a separate heater unit that is plumbed inline with the spa’s circulation loop, away from the control enclosure.
This distinction matters because using the wrong heater configuration is the most common cause of flow errors and heating failures after a spa control replacement.
United Spa Controls CR117S: Key Specs
- Heater configuration: Remote heater (separate externally plumbed unit)
- Voltage: 120V / 240V selectable
- Topside panel: T7 compatible (same interface as CB117P)
- Pump support: Single and multi-pump configurations
- Safety monitoring: Flow switch and thermal cutoff protection
- Application: Retrofit and new-build residential spa installations
The CR117S shares the same topside panel interface and voltage flexibility as the CB117P. The key difference is entirely in how the heater is connected.
CR117S vs CB117P: What Is the Difference?
The most common question when choosing between CR117S and CB117P is about the heater.
| Feature | CR117S | CB117P |
|---|---|---|
| Heater location | Remote (external, plumbed separately) | Bottom-mounted (integrated into control box) |
| Voltage | 120V / 240V selectable | 120V / 240V selectable |
| Topside panel | T7 compatible | T7 compatible |
| Plumbing requirement | Remote heater plumbing in place | Bottom-mount heater plumbing in place |
| Common install type | Older spa designs, larger equipment bays | Compact retrofit installations |
The rule: match the control system to the existing heater plumbing. If your spa has a heater located away from the control box with its own plumbing connections, the CR117S is the correct choice. Installing a CB117P into a remote heater configuration will result in flow errors because the system expects water to flow through the bottom-mounted heater — which is not present.
For a full side-by-side comparison of all three systems, see: United Spa Controls C6 vs CB117P: Which System Do You Need?
Who Should Choose the CR117S?
The CR117S is the right system if your spa matches any of the following:
Your spa has a remote heater already plumbed in. If the existing equipment bay shows a separate heater unit connected via plumbing unions to the circulation loop, the CR117S is designed to interface with that configuration.
A previous CB117P install produced flow errors. If a CB117P was installed and immediately triggered FLO or DR error codes, the likely cause is a heater configuration mismatch. The CR117S corrects this by routing heating through the remote heater circuit.
Your spa was manufactured before 2010. Older residential hot tubs more commonly used remote heater layouts. The CR117S is the standard replacement for these systems.
Your equipment bay requires a separate heater. In some larger spa cabinets, the heater is positioned remotely for plumbing or maintenance access reasons. The CR117S is built for this layout.
CR117S Compatibility: What to Check Before Ordering
Before ordering a CR117S, confirm the following:
Heater plumbing direction. Remote heaters have a specific flow direction. Verify inlet and outlet orientation before purchasing a replacement heater unit to pair with the CR117S.
Topside panel connector. The CR117S uses the T7 topside interface. If replacing an older system with a different panel type, a new T7 topside panel may also be required.
Voltage configuration. The CR117S supports both 120V and 240V. Confirm your spa’s electrical supply before configuring the replacement system.
Pump count. Verify the number of pumps your spa runs and confirm the CR117S supports your configuration before installation.
For detailed compatibility guidance across all United Spa Controls models, see the United Spa Controls Brand Overview.
Common CR117S Error Codes and What They Mean
Like all United Spa Controls systems, the CR117S communicates faults through the T7 topside panel. The most common error codes on a CR117S installation are flow-related:
FLO / FL / DR: Water flow is insufficient or not detected. On a CR117S, this is most often caused by a blocked filter, an air lock in the heater circuit, or a failed flow switch in the remote heater assembly.
OH: Overheat. The water temperature exceeded the safety threshold. Check for blocked flow through the remote heater, a stuck relay, or a failed high-limit sensor.
ICE: Freeze protection activated. Normal behavior in cold conditions — the system runs the pump to prevent freezing.
If error codes appear immediately after a CR117S installation, the most likely cause is incorrect plumbing direction at the remote heater or an air lock in the heater circuit.
Where to Buy the United Spa Controls CR117S
SpasRus stocks the United Spa Controls CR117S along with the C6, CB117P, and compatible replacement parts including remote heater assemblies, T7 topside panels, and flow switches.
👉 Browse United Spa Controls systems at SpasRus
If you are unsure whether your spa requires a CR117S or CB117P, contact us before ordering. Identifying the correct heater configuration before purchase is the single most important step in a successful spa control replacement.
SpasRus is a North American retailer specializing in United Spa Controls spa systems, heaters, topside panels, and compatible replacement parts.