Description
Product Overview
The Armstrong 174033MF-043 S-35AB is a versatile and compact circulator pump designed for reliable performance in residential and light commercial hydronic heating systems. With its efficient 1/6 HP motor and convenient 3-speed settings, this pump offers the flexibility to fine-tune performance for a wide range of applications, from zone heating and boiler circulation to radiant floor systems.
Featuring a durable cast iron construction and a corrosion-resistant stainless steel shaft, the S-35AB is built for long service life in closed-loop systems. Its compact, inline design allows for easy installation in space-constrained locations, while the multi-speed capability ensures optimal flow rates for various system requirements. The pump’s wet-rotor design provides quiet operation and eliminates the need for routine lubrication, making it an ideal choice for noise-sensitive environments like homes, apartments, and small commercial buildings.
For contractors and homeowners seeking a dependable, adjustable circulator that balances performance with ease of installation, the Armstrong S-35AB delivers proven reliability in a compact package.
📚 Hydronic System Resources
Technical Specifications
| Specification Category | Detail |
|---|---|
| Manufacturer Part Number | 174033MF-043 |
| Series | Armstrong S-Series |
| Model | S-35AB |
| Horsepower | 1/6 HP |
| Speed Settings | 3-Speed (Manual Selection) |
| Voltage | 120V, 1-Phase |
| Connection Size | 1″ Female NPT |
| Connection Type | Threaded |
| Maximum Working Pressure | 125 PSI / 8.6 Bar |
| Maximum Temperature | 230°F / 110°C |
| Housing Material | Cast Iron |
| Shaft Material | Stainless Steel |
| Motor Type | Wet Rotor |
| Mounting | Inline |
| Weight | Approximately 8 lbs (3.6 kg) |
What’s Included
| Included | Not Included / Required Separately |
|---|---|
| ✓ Complete Circulator Assembly | ✗ Isolation Valves |
| ✓ 1″ NPT Threaded Connections | ✗ Pipe Sealant/Teflon Tape |
| ✓ 3-Speed Control Switch | ✗ Power Cord |
| ✓ Installation Guide | �air System Flushing |
🛠️ Recommended Installation Accessories
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Isolation: Armstrong 1″ Union Isolation Valves
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Maintenance: Hydronic System Flush Kit
Comparison Table: S-35AB vs. Alternative Circulators
| Feature | Armstrong S-35AB | Single-Speed Circulator | ECM Smart Circulator |
|---|---|---|---|
| Speed Control | 3-Speed Manual | Fixed Speed | Variable Speed (Auto) |
| Energy Efficiency | Good | Fair | Excellent |
| Cost Effectiveness | Excellent Value | Budget-Friendly | Premium |
| Installation | Simple | Simple | Requires Programming |
| Flexibility | Good (3 settings) | Poor | Excellent |
| Ideal Application | Residential Heating, Zones | Basic Circulation | High-Efficiency Systems |
Frequently Asked Questions (FAQs)
Q1: What are the typical applications for this 1/6 HP circulator?
A: The S-35AB is ideal for:
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Residential boiler circulation
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Zone heating systems
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Radiant floor heating loops
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Small commercial heating applications
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Replacement for existing 1/6 HP circulators
Q2: How do I select the right speed setting?
A: Speed selection depends on your system requirements:
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Speed I (Low): For systems with low head pressure requirements
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Speed II (Medium): For average residential applications
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Speed III (High): For systems requiring higher flow rates
Start with medium speed and adjust based on system performance.
Q3: Is this pump self-lubricating?
A: Yes, the wet-rotor design uses the system fluid for lubrication and cooling, eliminating the need for routine lubrication maintenance.
Q4: Can this pump be used with potable water systems?
A: No, this circulator is designed for closed-loop hydronic heating systems only. The materials are not certified for potable water applications.
Q5: What maintenance does this circulator require?
A: Maintenance is minimal:
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Annual visual inspection for leaks
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Ensuring clean system fluid
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Checking for unusual noises
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Verifying proper operation at each speed setting
Internal Link: Learn proper installation techniques in our Residential Circulator Installation Guide.
Pros and Cons
| Pros | Cons |
|---|---|
| 3-Speed Flexibility: Adjustable performance for different system needs | Not for Potable Water: Limited to closed-loop heating systems |
| Compact Design: Fits in tight spaces common in residential installations | Manual Speed Selection: Requires physical adjustment at the pump |
| Quiet Operation: Wet-rotor design minimizes noise | Cast Iron Construction: Heavier than composite-bodied pumps |
| Easy Installation: Standard threaded connections simplify installation | Basic Technology: Lacks modern smart features |
| Proven Reliability: Armstrong quality with wide parts availability | Fixed Flow Rates: Limited to three predetermined settings |
Conclusion & Ideal Use Case
The Armstrong 174033MF-043 S-35AB circulator pump is an excellent choice for residential and light commercial hydronic systems where reliable performance, adjustable flow rates, and compact design are key considerations.
This pump is perfectly suited for:
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Residential forced hot water systems
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Hydronic zone control applications
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Small to medium-sized radiant floor heating systems
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Boiler replacement and retrofit projects
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Light commercial building heating systems
If you need a dependable, adjustable circulator that offers good value and straightforward operation for standard heating applications, the Armstrong S-35AB delivers consistent performance you can count on.
🔗 Official Technical Resource
For complete technical specifications and installation instructions, visit the Armstrong Pump Product Documentation for the most accurate and up-to-date information.
