AP3 Series

• WETBACK for low maintenance, long life and maximum efficiency
• Liberal dimensions; durable, proven three-pass firetube arrangement
• Flexible firing rate and output
• Undesirable, throw-away, non-repairable construction is avoided (as seen on some watertube and exotic boiler designs)
• “Off the shelf” components resulting in lower parts cost
• Minimal Service costs
• Heavy-duty, first-class materials
• Renowned for a long life, up to 30 years or more
• Equipped with premium, packaged FORCED DRAFT burners; factory test-fired
• Extra handholes are provided, in a superior location, in the front tube sheet below the furnace

• Thoughtfully engineered; enhanced by our extensive design experience
• Excellent overall plant efficiency (83% plus combustion efficiency on natural gas, 85% plus on No. 2 oil)
• Skillfully crafted to high standards
• Ample steam space/release surface
• Doors open without removal of burner components or fuel and power lines
• Large 5/8″ BOLTS are used on all doors; fewer are required; opening/closing is faster; easily damaged studs are avoided
• Heavy door gaskets are intended for repeated use and are easily replaced
• Outstanding inspection accessibility

• Safety valve(s)
• Waterglass set
• Pressure gauge
• Gauge cock
• Trycocks
• Pressure control – high limit (manual reset)
• Pressure control – operating
• Pressure control – high fire or proportional firing (full modulation)
• McDonnell & Miller 157S low water cutoff and pump control

• Water column blowdown valve
• Manual reset, probe type auxiliary low water cutoff control
• Stainless steel feed water check valve
• Feed water shutoff valve
• Ball type, quick opening, bottom blowoff valve (Optional quick opening valve types are available)
• Slow opening Y-pattern globe, bottom blowoff valve
• Surface blowdown skimmer pipe, ball valve and throttling valve
• Drain valve
• Stack thermometer

• Relief valve(s)
• Pressure guage with gauge cock
• Water temperature indicator
• Manual reset, probe type low water cutoff
• Operating temperature control

• Manual rest high limit temperature control
• High fire temperature control or proportional firing rate (modulationg) control
• Drain valve
• Stack thermometer

The furnaces of APEX Series boilers are of large diameter and ample length. This, along with the full water-cooled rear chamber, ensures that the furnace absorbs much more heat, maximizing efficiency and minimizing pollutants, while allowing tubesheets to have a cooler, longer life.

We specialize in customizing your boiler. The APEX can be equipped to suit a wide variety of installations and specifications. We will help direct you to the most cost-effective models and features.