PRODUCT FEATURES
- Gas fired water boiler with cast aluminum heat exchanger
- Venturi mixing body mixes air and gas providing higher efficiency
- Designed to operate in low temperature condensing applications
- Outdoor reset and domestic hot water priority standard
- Negative regulated gas valve precisely delivers gas to the boiler
- U-Control gives you the power for easy set-up and maintenance
- Modulates with 5 to 1 turn-down ratio
- Variable speed motor matches combustion output to heating needs
- High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications
| Model |
A.G.A. Input (MBH) |
DOE Heating Capacity (MBH) |
Net I=B=R Ratings (MBH) |
Annual Fuel Utilization Efficiency (AFUE) |
Min. Vent Size |
| UG-80 |
80 |
71 |
62 |
93 |
2 in. PVC/ABS |
| UG-105 |
105 |
94 |
81 |
92 |
2 in. PVC/ABS |
| UG-155 |
155 |
139 |
123 |
93 |
3 in. PVC/ABS |
| UG-230 |
230 |
207 |
183 |
92.8 |
3 in. PVC/ABS |
| UG-310 |
310 |
289 |
252 |
93.3 |
4 in. PVC/ABS |
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CLICK HERE FOR ULTRA SERIES 3 BOILER MANUAL
CLICK HERE FOR ULTRA SERIES 3 USER'S MANUAL
