1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your AB SP-210K+Brackets Solar Pool Heat Exchanger. Please read these instructions thoroughly before proceeding with installation or use. Retain this manual for future reference.
Safety Information: Always follow local codes and regulations for plumbing and electrical installations. Professional installation is recommended.
2. Product Overview
The AB SP-210K+Brackets Solar Pool Heat Exchanger is designed for efficient heat transfer in various applications, particularly for swimming pools, spas, and hot tubs. Constructed from high-grade corrosion-inhibited Stainless Steel 316L, it features a unique spiral twist bellows design to maximize energy conversion efficiency.
Key Features:
- Efficient Heat Transfer: Unique spiral twist bellows design for optimized energy conversion.
- Durable Construction: Made from Stainless Steel 316L, suitable for chemically treated water.
- Versatile Application: Ideal for freshwater applications, pool/spa/hot tub heating, outdoor wood furnaces, hydronic heating, radiant floor heating, and solar water heaters.
- Compact Design: Space-saving footprint allows for flexible vertical or horizontal installation.
- Easy Installation: Features standard 1 1/2" FPT port connections for pool water and hot water, with included mounting brackets.
Product Visuals:

Figure 2.1: Front view of the AB SP-210K+Brackets Solar Pool Heat Exchanger.

Figure 2.2: Cross-section view illustrating the internal spiral-twisted corrugated tubes and welded shell construction.

Figure 2.3: Detail of the spiral-twisted corrugated tube design, which enhances heat transfer efficiency.
Product Video:
Video 2.1: An overview of the AB Shell and Tube Heat Exchanger, highlighting its features and benefits. This video is provided by the seller, ALFA HEATING SUPPLY.
3. Specifications
The following tables provide detailed specifications for the AB Solar Pool Heat Exchanger series, including the SP-210K+Brackets model.
General Product Specifications:
| Attribute | Value |
|---|---|
| Size | SP-210K+Brackets |
| Color | Silver |
| Material | Stainless Steel 316L |
| Brand | AB |
| Product Dimensions | 22.44"L x 2.99"W |
| Style | 210K+Brackets |
| Special Feature | Spiral corrugated heat exchanging tubing and TIG welding |
| Shape | Round |
| Pattern | Solid |
| Installation Type | Hardware installation |
| Item Weight | 7.3 pounds |
| Manufacturer | AB |
| Item Model Number | SP-210KMB |
Performance Data (SP-210K model highlighted):
| Model No. | Normal Capacity Kbtu/hr | Pool Capacity (gallons @1°F) | Hot Water Flow USGPM | Hot Water Pressure drop psig | Cold Water Flow USGPM | Cold Water Pressure drop psig | Heat Transfer Area Ft² | Shell (pool) side | Tube (hot) side | Vol. USGAL |
|---|---|---|---|---|---|---|---|---|---|---|
| SP - 55K | 55 | 4700 | 7.49 | 0.85 | 48.84 | 1.03 | 1.636 | 1 1/2" | 1" | 4000 |
| SP - 85K | 85 | 7300 | 8.27 | 1.02 | 56.22 | 1.28 | 2.702 | 1 1/2" | 1" | 8000 |
| SP - 155K | 155 | 13300 | 8.46 | 1.10 | 62.66 | 1.58 | 3.552 | 1 1/2" | 1" | 12000 |
| SP - 210K | 210 | 18000 | 9.13 | 0.38 | 63.94 | 1.06 | 4.769 | 1 1/2" | 1 1/2" | 18000 |
| SP - 300K | 300 | 25800 | 11.16 | 0.56 | 86.11 | 1.63 | 6.889 | 2" | 1 1/2" | 24000 |
| SP - 360K | 360 | 31500 | 12.63 | 0.85 | 94.70 | 2.40 | 9.128 | 2" | 1 1/2" | 32000 |
| SP - 600K | 600 | 52500 | 17.44 | 1.22 | 114.16 | 3.07 | 16.695 | 2 1/2" | 2" | 53000 |
| SP - 1200K | 1200 | 105600 | 30.19 | 2.21 | 224.06 | 4.05 | 21.582 | 2 1/2" | 2" | 106000 |
| SP - 2400K | 2400 | 211200 | 70.65 | 2.87 | 448.13 | 5.30 | 45.963 | 4" | 2 1/2" | 265000 |
| SP - 3000K | 3000 | 264000 | 90.58 | 3 | 560.16 | 5.90 | 54.575 | 4" | 2 1/2" | 318000 |
| SP - 3600K | 3600 | 316800 | 98.13 | 3.2 | 672.19 | 5.70 | 69.107 | 4" | 2 1/2" | 318000 |
| SP - 4500K | 4500 | 396000 | 135.87 | 3.1 | 840.24 | 5.90 | 90.635 | 4" | 2 1/2" | 397500 |
| SP - 6000K | 6000 | 526800 | 180 | 4.32 | 1120.80 | 6.2 | 114.575 | 4" | 2 1/2" | 475500 |
Note 1: Nominal values are based on 140°F temperature difference between incoming heating and heated water.
Note 2: All capacities are based on Stainless Steel 316L, 304, or Titanium heat exchanger tube bundles.
Dimensional Specifications (SP-210K model highlighted):

Figure 3.1: Visual comparison of different AB heat exchanger models by size.
| Model | Area(ft²) | A | B | C | D | E | F |
|---|---|---|---|---|---|---|---|
| 55k | 1.64 | 10.23 | 2.36 | 14.17 | 3/4" | 1" | 1.89 |
| 55k | 1.64 | 10.23 | 2.36 | 14.17 | 1" | 1 1/2" | 1.89 |
| 85k | 2.70 | 16.53 | 2.36 | 20.47 | 3/4" | 1" | 1.89 |
| 85k | 2.70 | 16.53 | 2.36 | 20.47 | 1" | 1 1/2" | 1.89 |
| 155k | 3.55 | 13.78 | 2.99 | 17.72 | 1" | 1 1/2" | 1.89 |
| 210k | 4.77 | 18.50 | 2.99 | 22.44 | 1 1/2" | 1 1/2" | 1.89 |
| 300k | 6.90 | 26.77 | 2.99 | 30.71 | 1 1/2" | 2" | 1.89 |
| 360k | 9.13 | 28.74 | 3.50 | 32.68 | 1 1/2" | 2" | 1.89 |
| 600k | 16.69 | 29.92 | 4.49 | 35.43 | 2" | 2 1/2" | 1.89 |
| 1200k | 21.58 | 29.92 | 5.24 | 35.43 | 2" | 2 1/2" | 1.89 |
| 2400k | 48.11 | 31.50 | 6.61 | 37.40 | 2" | 4" | 3.94 |
Note: Dimensions A, B, C, D, E, F refer to specific measurements as depicted in the product's technical drawings.
4. Setup and Installation
Proper installation is crucial for the optimal performance and longevity of your heat exchanger. The unit can be installed either vertically or horizontally, depending on your system's layout and space availability. Mounting brackets are included for convenience.
Connection Ports:
- Pool Water Connection: 1 1/2" FPT
- Hot Water Connection: 1 1/2" FPT
Typical Pool Heat Exchange System Diagram:

Figure 4.1: Schematic of a pool heating system integrating the heat exchanger with a pump, filter, and boiler/solar system.
Flow Direction in Pool Heat Exchanger:

Figure 4.2: Illustration of water flow paths within the heat exchanger for optimal heat transfer. Heated water flows to the pool, and incoming water from the pool enters the shell side. Incoming solar water heater water enters the tube side.
Ensure all connections are secure and leak-free. Consult a qualified professional for complex installations or if you are unsure about any step.
5. Operation
The heat exchanger operates on the principle of transferring heat from a primary hot water source (e.g., boiler, solar panels) to the pool water without direct mixing. The hot water flows through the internal tubes, while the cooler pool water flows through the shell side, absorbing heat as it passes over the heated tubes.
Heat Exchange Process:

Figure 5.1: Visual representation of the heat exchange process, showing cold water entering and warm water exiting, facilitated by a heat source.
For optimal performance, ensure consistent flow rates for both the hot water and pool water circuits as specified in the performance data table (Section 3). A temperature controller can be integrated into your system to maintain desired pool water temperatures.
6. Maintenance
The AB Solar Pool Heat Exchanger is designed for low maintenance. Regular inspection and cleaning can extend its service life.
Recommended Maintenance:
- Periodic Inspection: Regularly check all connections for leaks and ensure the unit is securely mounted.
- Cleaning: The simple structure allows for easy maintenance and cleaning. Depending on water quality, periodic flushing of both the shell and tube sides may be necessary to prevent scale buildup and maintain heat transfer efficiency. Consult a plumbing professional for detailed cleaning procedures if needed.
- Winterization: In colder climates, ensure the unit is properly drained and protected from freezing temperatures if the pool system is shut down for the winter.
7. Troubleshooting
If you encounter issues with your AB Solar Pool Heat Exchanger, consider the following common points:
- Insufficient Heating: Verify that the hot water source is operating correctly and providing adequate temperature and flow. Check for proper flow rates on both the hot water and pool water sides. Ensure there are no blockages in the piping or within the heat exchanger.
- Leaks: Inspect all plumbing connections for signs of leakage. Tighten connections as necessary. If a leak is detected within the unit itself, discontinue use and contact customer support.
- Reduced Flow: Check pumps and filters in both circuits to ensure they are functioning correctly and not obstructed.
For persistent issues or concerns, please refer to the Warranty & Support section for contact information.
8. Warranty & Support
AB is committed to providing dependable and professional products. While specific warranty details are not provided in this manual, AB offers dedicated technical and service support in the USA.
For technical assistance, warranty inquiries, or to report any issues with your AB Solar Pool Heat Exchanger, please contact AB customer support through the official channels provided at the point of purchase or on the manufacturer's website.
When contacting support, please have your product model number (SP-210K+Brackets or SP-210KMB) and purchase date available.