FlexCore Symmetrical Firetube boilers bring hydronic heating products to unprecedented levels of operating efficiency.
Unlike other manufacturers; from start to finish the FlexCore was designed, developed and engineered by the experts at RBI.
Engineered for performance and longevity the FlexCore utilizes a perfectly temperature balanced heat exchanger that provides not only the highest efficiencies but also a durability beyond that of any competitive firetube boiler on the market.
features and benefits
- Up to 99% Maximum Efficiency
- 850 - 6,000 MBH
- AHRI Certified Efficiency 97.1%
- Stainless Steel Firetube Heat Exchanger
- Variable Volume Flow
- Full Modulation
- Patented "Turbo Pilot" Ignition
- HeatNet 3.0 Integrated Control Platform
- Touchscreen Programming & Diagnostics
- Low NOx & CO
- Modern Jacket Design
- Superior Durability
- Easy Installation & Maintenance
flexcore Dimensions and ratings
| Input | Boiler | Output | Unit | Depth | Unit | Width | Unit | Height | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | MBH | kW | MBH | kW | In. | mm | In. | mm | In. | mm |
| 850 | 850 | 249 | 812 | 238 | 70 | 1778 | 32 | 812.8 | 80 | 2031.9 |
| 1000 | 1000 | 293 | 955 | 280 | 70 | 1778 | 32 | 812.8 | 80 | 2031.9 |
| 1500 | 1500 | 440 | 1426 | 418 | 70 | 1778 | 32 | 812.8 | 80 | 2031.9 |
| 2000 | 1999 | 586 | 1901 | 557 | 72.4 | 1838.3 | 32 | 812.8 | 80 | 2031.9 |
| 2500 | 2500 | 733 | 2397 | 703 | 72.4 | 1838.3 | 32 | 812.8 | 80 | 2031.9 |
| 3000 | 3000 | 879 | 2904 | 851 | 72.4 | 1838.3 | 32 | 812.8 | 80 | 2031.9 |
| 3500 | 3499 | 1025 | 3327 | 975 | 109.4 | 2770.7 | 34 | 863.8 | 80 | 2031.9 |
| 4000 | 3998 | 1172 | 3802 | 1114 | 109.4 | 2770.7 | 34 | 863.8 | 80 | 2031.9 |
| 4500 | 4500 | 1319 | 4329 | 1269 | 109.4 | 2770.7 | 34 | 863.8 | 80 | 2031.9 |
| 5000 | 5000 | 1465 | 4795 | 1405 | 109.4 | 2770.7 | 34 | 863.8 | 80 | 2031.9 |
| 6000 | 6000 | 1758 | 5808 | 1702 | 109.4 | 2770.7 | 34 | 863.8 | 80 | 2031.9 |
| Cat IV Positive | Cat II | Air Intake | Connections | Shipping | Weight | ||
|---|---|---|---|---|---|---|---|
| Size | UL Listed SS** | Negative** | Gas Nat | Water | Lbs | Kg | |
| 850 | 5" | 8" | 6" | 1" | 3" | 1515 | 687 |
| 1000 | 5" | 8" | 6" | 1" | 3" | 1515 | 687 |
| 1500 | 6" | 8" | 8" | 1-1/2" | 3" | 1555 | 705 |
| 2000 | 6" | 10" | 8" | 1-1/2" | 3" | 1880 | 853 |
| 2500 | 8" | 12" | 8" | 1-1/2" | 3" | 1955 | 887 |
| 3000 | 8" | 12" | 8" | 1-1/2" | 3" | 2055 | 932 |
| 3500 | 10" | 12" | 10" | 2-1/2" | 4" | 3420 | 1551 |
| 4000 | 10" | 12" | 10" | 2-1/2" | 4" | 3745 | 1699 |
| 4500 | 10" | 14" | 10" | 2-1/2" | 4" | 3600 | 1633 |
| 5000 | 12" | 14" | 12" | 2-1/2" | 4" | 3920 | 1778 |
| 6000 | 12" | 14" | 12" | 2-1/2" | 4" | 4150 | 1882 |
**Diameters may vary based on system design
Literature