HONEYWELL C317-2R Aquastat High Limit Relay Boiler Control L8148A L8124L C317-11R
( Brand: Honeywell ), ( Manufacturer Part Number: C317-2R ), ( Model: HONEYWELL L8148A C317-2R ), ( Part Type: Control Boiler ), ( Compatible Brand: For Honeywell ), ( Unit Type: Unit ), ( Power Source: Corded Electric ), ( Manufacturer Warranty: 1 Year ), ( Voltage: 120 V ), ( Material: Brass ), ( Compatible Product: Central Furnace ), ( Country Of Origin: United States ), ( Power Phase: 1 Phase )
Review HONEYWELL Aquastat High Limit Relay Boiler Control Read
The **Honeywell C317-2R L8124L C317-11R Aquastat High-Limit Relay Boiler Control** is a robust and precision-engineered boiler control system designed to ensure optimal performance, safety, and efficiency in residential and light commercial heating applications. This advanced unit combines the reliability of Honeywell s trusted Aquastat technology with a high-limit relay, providing dual-layer protection and control for hydronic heating systems, including boilers, radiant floor heating, and domestic hot water systems. The **C317-2R** serves as the primary Aquastat, offering precise temperature regulation by monitoring and maintaining the desired water temperature within the boiler, while the **C317-11R** functions as a high-limit safety relay, acting as a critical fail-safe mechanism to prevent overheating by shutting down the boiler if temperatures exceed safe thresholds. The **L8124L** component integrates seamlessly as a relay module, enabling the Aquastat to interface with the boiler s ignition system, pumps, and other control elements, ensuring smooth operation and responsive adjustments.
Engineered with durability in mind, this boiler control system is constructed from high-quality materials that withstand the demands of continuous operation, including corrosion-resistant components and a robust mounting bracket for secure installation. The **C317 series** Aquastats feature a clear, easy-to-read dial with a sliding pointer, allowing for quick and accurate temperature adjustments typically ranging from **120 F to 220 F** to accommodate various heating requirements, whether for space heating, domestic hot water, or a combination of both. The high-limit relay (**C317-11R**) is set to a default safety cutoff point, typically around **220 F**, but can be adjusted to match specific system needs, providing an additional layer of protection against boiler failure, pipe damage, or other thermal risks. The inclusion of the **L8124L relay module** enhances functionality by enabling the Aquastat to control external devices such as gas valves, pumps, or circulators, ensuring efficient energy use and extended equipment lifespan.
Ideal for use with **natural gas, propane, or oil-fired boilers**, this control system is compatible with a wide range of heating setups, including cast iron, steel, or condensing boilers, as well as hybrid systems that incorporate renewable energy sources. The **C317-2R** Aquastat s dual-wire design simplifies installation, requiring only two connections for temperature sensing and control, while the **C317-11R** high-limit relay adds an extra measure of safety without complicating the setup. Honeywell s reputation for precision and reliability ensures that this boiler control system delivers consistent performance, reducing the risk of overheating, scaling, or system malfunctions that could lead to costly repairs or downtime. Whether installed in a cozy residential home, a small commercial building, or a multi-family dwelling, this control unit provides the confidence of knowing that the heating system operates within safe and efficient parameters, all while maintaining comfort and energy savings.
For technicians and homeowners alike, the **Honeywell C317-2R L8124L C317-11R** represents a smart investment in heating system longevity and safety. Its straightforward design, combined with Honeywell s industry-leading quality, makes it a preferred choice for professionals seeking a dependable boiler control solution. With minimal maintenance requirements and a focus on performance, this system ensures that heating systems run smoothly, efficiently, and safely for years to come.
**Pros and Cons of buying a Honeywell C317-2R/L8124L/C317-11R Aquastat High-Limit Relay Boiler Control**
### **Pros**
1. **Compatibility and Reliability** This Honeywell Aquastat is designed specifically for residential and light commercial boiler systems, ensuring it integrates seamlessly with compatible boilers. Honeywell is a well-known brand in HVAC controls, offering proven reliability in temperature regulation and safety features.
2. **High-Limit Safety Function** The device includes a high-limit relay, which acts as a critical safety mechanism by shutting off the boiler if the water temperature exceeds a preset threshold. This prevents overheating, boiler damage, and potential hazards like pipe bursts or fires.
3. **Adjustable Temperature Settings** The Aquastat allows for precise temperature adjustments, enabling users to optimize boiler performance for efficiency and comfort. This flexibility is useful for different heating demands, such as seasonal changes or varying household needs.
4. **Durability and Longevity** Honeywell components are generally built to last, with robust construction that resists wear and tear over time. The relay mechanism is designed for frequent operation without failure, reducing the need for frequent replacements.
5. **Easy Installation and Replacement** The unit is designed for straightforward installation, often requiring minimal wiring adjustments. It can serve as a direct replacement for faulty or outdated Aquastats, saving time and labor costs compared to more complex control systems.
6. **Cost-Effective for Repairs** If your boiler s existing Aquastat is malfunctioning, replacing it with this model can be significantly cheaper than overhauling the entire boiler control system. It extends the life of the boiler while maintaining safety and efficiency.
7. **Compatibility with Modern Boilers** Many newer boilers, especially those manufactured in the last 15 20 years, are designed to work with Honeywell Aquastats. This ensures backward and forward compatibility with other Honeywell or third-party controls if needed.
8. **Minimal Maintenance Requirements** Once installed correctly, the Aquastat requires little to no maintenance. Regular checks of wiring and occasional cleaning of contacts are typically sufficient to keep it functioning properly.
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### **Cons**
1. **Limited Advanced Features** Unlike modern smart thermostats or programmable control systems, this Aquastat lacks advanced features such as Wi-Fi connectivity, remote monitoring, or automated scheduling. It operates on basic on/off temperature control.
2. **Manual Adjustments Required** Users must manually adjust the temperature settings, which may be inconvenient for those who prefer automated or app-controlled systems. This can be a drawback for tech-savvy users accustomed to smart home integration.
3. **Potential for User Error** Misalignment or incorrect wiring during installation can lead to malfunctioning. While the design is straightforward, improper handling (e.g., overtightening screws or misaligning contacts) can cause issues like intermittent operation or failure to engage.
4. **No Diagnostic Indicators** Unlike some modern controls, this Aquastat does not provide visual or audible feedback (e.g., error codes or beeps) to indicate specific malfunctions. Troubleshooting may require testing with a multimeter or consulting manuals.
5. **Dependence on Boiler Compatibility** While widely compatible, not all boilers may work perfectly with this model. Older or non-standard boilers might require additional modifications or adapters, which could complicate installation.
6. **Replacement Parts Availability** While Honeywell parts are generally available, older models may become harder to source over time. Always verify availability before purchasing, especially if replacing an older system.
7. **No Integration with Smart Home Ecosystems** If you re part of a smart home setup (e.g., Alexa, Google Home, or Z-Wave), this Aquastat cannot be controlled or monitored remotely. It operates independently of such systems.
8. **Potential for Relay Wear** Relays, while durable, can wear out over time with frequent cycling (e.g., in systems with rapid heating demands). This may eventually require replacement of the relay component within the Aquastat.
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### **Conclusion**
The Honeywell C317-2R/L8124L/C317-11R Aquastat is a **practical and reliable choice** for homeowners or technicians looking to replace a faulty high-limit control in a boiler system. Its strengths lie in **safety, simplicity, and compatibility**, making it ideal for basic heating applications where advanced automation is unnecessary. The device excels in **preventing overheating, offering adjustable temperature control, and being cost-effective for repairs**.
However, its **lack of smart features, manual operation, and limited diagnostic tools** may be drawbacks for users seeking modern convenience or those with complex heating needs. If your primary goal is **safety, longevity, and straightforward functionality**, this Aquastat is a solid investment. If you prioritize **smart home integration, remote control, or advanced diagnostics**, you may need to explore alternative solutions (e.g., smart thermostats with boiler compatibility).
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### **Recommendation**
**Buy this Honeywell Aquastat if:**- You need a **direct replacement for a failing high-limit control** in a compatible boiler.
- Your boiler lacks advanced controls, and you want a **simple, reliable safety switch**.
- You prefer **manual but precise temperature adjustments** without smart features.
- You re working on a **budget-friendly repair** and want to avoid replacing the entire boiler.
**Avoid or consider alternatives if:**- You want **smart home integration** (e.g., remote control via app).
- Your boiler requires **advanced diagnostics or programming** (e.g., for multi-stage heating).
- You re upgrading to a **newer boiler system** that supports modern thermostats.
- You frequently experience **relay or contact issues** in your current setup (may indicate a need for a different control type).
For most **residential applications where safety and basic functionality are priorities**, this Honeywell Aquastat is a **highly recommended purchase**. Always ensure compatibility with your boiler s wiring and specifications before installation.
Details:
Used - item is untested, On top it says C317-11R L8124L, Looks to be in good shape however the metal cover kind of warped and doesn't really fit over unit fully properly as should. Also not sure if the cover part is right one because it says L8148A on cover, which different than what unit itself. Please see pictures to this and understand that before offering / buying.
part #: c3172r prices
- $116.00-$1185.00
specifications hvaapa:
- brand: Honeywell
- mpn: C317-2r
- model: Honeywell L8148a C317-2r
- part type: Control Boiler
- compatible brand: For Honeywell
- unit type: Unit
- power source: Corded Electric
- manufacturer warranty: 1 Year
- voltage: 120 V
- material: Brass
- compatible product: Central Furnace
- country of origin: United States
- power phase: 1 Phase
returns hvaapa:
- time: 30 Days
- policy: Returns Accepted
- paid by: Seller
- method: Money back
shipping hvaapa:
- service: USPS Ground Advantage
- type: Calculated
- cost: $9.69
- carrier: USPS
- class: Standard
- transit: 4-10 Days
payments hvaapa:
- other
- credit card: Mastercard
- wallet: Apple-pay
seller hvaapa:
- city: Henniker, New Hampshire
- rating: 100.0%
- # reviews: 6284
offer hvaapa:
- quantity: 1
- sold: 0
- options: Ship-to-home
- started: May 16, 2026
- best offers: True
- availability: In Stock
general hvaapa:
- HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Controls Circuit Boards
- condition: Used
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