| AFUE Rating | : | 87 % |
| GPH | : | 1.2 gph |
| Material | : | Iron |
| Model | : | UO-4 |
| Net BTU Rating | : | 127 mbh |
| Series | : | 3 Series |
| Vent Size | : | 8 x 8 in |
| Vent Type | : | Direct |
Weil-McLain® Water Boiler, 3 Series, Model: UO-4, 87 % AFUE Rating, 127 mbh Net BTU Rating, Direct Vent, GPH: 1.2 gph, 8 x 8 in Vent, Iron
- Dedicated water only oil boiler
- Flexible direct or chimney venting - no power assisted fan needed
- Reversible swing away burner door
- Three-pass cast iron heat exchanger with captured elastomer seals
- Commercial-grade three-pass cast iron heat exchanger for long service life
- Sleek, innovatively styled jacket with rear piping and wiring openings and concealed controls for an appliance like appearance
- Adaptable door design and interchangeable side panels that can accommodate most installation conditions
- The snap-on front jacket panel allows easy entry to the full access burner door
- The left and right side panels are interchangeable
- All piping, wiring and venting connections are located in the rear of the boiler for a cleaner look
- The entire housing and top control tray can be easily removed for hand trucking
- Removable door lessens the overall weight when trucking
- The symmetrical design enhances strength and durability
- Bolts on both sides create a uniform consistent seal
- A quick-disconnect plug cuts burner power when the door is open
- Strategically designed flueway fins increase the heat transfer surface area, which extracts more heat and increases efficiency without penalizing boiler back pressure
- The wider flueways decrease the negative impact of fouling
- An added benefit of the three-pass design is the horizontal configuration, which makes virtually all of the combustion chamber, turnaround and flueways visible from the front of the boiler for easy cleaning and maintenance
- Silicone-coated fiberglass rope insures a positive seal
- Revolutionary rear section design directs the flue gas flow into the flueways without sacrificing pressure drop through the inner and the outer flueways which eliminates rear refractory