Pennco Boilers 16 Series 150,000 BTU Gas-Fired Steam Boiler - 16B-150

Pennco 16 Series 16B‑150 | 150,000 BTU Gas‑Fired Steam Boiler

Want reliable steam heat for cast‑iron radiators without the fuss? The Pennco 16 Series 16B‑150 is a gas‑fired, cast‑iron steam boiler designed for long service life and straightforward maintenance. With 82% AFUE, an integral vent damper, and generous 2‑1/2" steam tappings, it delivers dry, even steam and fits the bill for many small‑ to mid‑size homes.

• Brand: Pennco
• MPN: 16B‑150
• Type: Gas‑Fired Steam Boiler
• Fuel: Natural Gas (propane configuration available as 1605HSIDP)
• Input: 150,000 BTU/h
• DOE Heating Capacity: 122,000 BTU/h
• AFUE: 82.0%
• Net AHRI: 92,000 BTU/h
• Ignition: Electronic Intermittent (with factory vent damper)
• Steam Chest: 6" for ample steam generation
• Supply/Return Tappings: 2‑1/2" (left and right; plug unused)
• Flue Collar: 6" diameter (use lined masonry or listed metal chimney)
• Boiler Water Volume: ~5.0 gallons (max); ~3.7 gallons below LWCO
• Electrical: 120V, 60 Hz; individual 15A circuit recommended
• Standard Safety Controls: Probe‑type or float LWCO, pressure limit control, 15 psi safety valve

Proven Cast Iron Steam Design

The 16 Series uses heavy‑duty cast‑iron sections with cast‑iron push nipples and a 6" steam chest to generate dry steam quickly and consistently—ideal for classic one‑pipe or two‑pipe radiator systems.

Right‑Sized For Typical Homes

With 150,000 BTU/h input and a 92,000 BTU/h Net AHRI steam rating (about 383 sq. ft. EDR), the 16B‑150 is a strong fit for many small‑ to mid‑size homes when matched to installed radiator area.

Simple Chimney Venting

This Category I natural‑draft boiler connects to a properly sized, lined chimney using standard vent connectors. The factory vent damper helps cut standby losses compared with older standing‑pilot boilers.

Built‑In Safety & Controls

Standard protections include a low water cut‑off, pressure limit control, and 15 psi safety valve. Electronic ignition fires only when needed to help save fuel.

Installer‑Friendly Near‑Boiler Piping

Large 2‑1/2" supply and return tappings on both sides simplify header layout and equalizer connections for clean, code‑compliant piping and better steam quality.