Give Your Radiators Reliable Steam With The Pennco Silver 1603HSID 75,000 BTU Cast‑Iron Natural Gas Steam Boiler

Looking for dependable residential steam heat in a compact footprint? The Pennco Silver 1603HSID is a gas‑fired, cast‑iron steam boiler built for long service life and straightforward maintenance. With up to 82.7% AFUE, an integral draft diverter for low overall height, and large 2‑1/2" steam supply tappings, it’s an easy upgrade for classic one‑pipe or two‑pipe radiator systems.

• Brand: Pennco
• MPN: 1603HSID (16 Series, Electronic Ignition)
• Type: Gas‑Fired, Cast‑Iron Residential Steam Boiler (Category I, Chimney Vent)
• Fuel: Natural Gas (LP conversion kit available)
• Input: 75,000 BTU/h
• DOE Heating Capacity: 62,000 BTU/h
• Net IBR (Steam): 47,000 BTU/h (≈ 196 sq. ft. EDR)
• AFUE: Up to 82.7%
• Venting: Built‑in draft diverter; 5" flue to a lined masonry or listed metal chimney
• Steam Supply / Return Tappings: (2) 2‑1/2" NPT each
• Safety & Controls: Electronic low water cut‑off, pressure limit control (pressuretrol), 15 psi ASME pop safety valve, glass water level gauge, steam pressure gauge
• Included: Factory motorized vent damper; square‑head plugs for unused tappings
• Electrical: 120V, 60 Hz (15A circuit typical)
• Notes: Add ~5‑1/2" to height for vent damper; reduce ratings 4% per 1,000 ft above 2,000 ft elevation

Built For Dry, Even Steam

A generous 6" steam chest helps separate water from steam so radiators heat quietly and evenly. Combined with the 2‑1/2" supply tappings, it’s easier to pipe a proper header and equalizer for clean, dry steam distribution.

Fuel‑Saving Ignition & Vent Damper

The 1603HSID’s intermittent electronic ignition fires only on a call for heat, and the factory motorized vent damper helps reduce standby losses up the chimney—an efficiency advantage over older standing‑pilot steam boilers.

Low‑Profile Draft Diverter

A built‑in draft diverter keeps the overall jacket height low—ideal for low‑ceiling basements and replacement installs where clearances are tight.

Rugged Cast‑Iron Reliability

Heavy‑duty cast‑iron sections with push‑nipples, stainless burners, and proven controls are designed for long, dependable service in residential steam systems.

Weight	297.0 lb
Height	36.38 in.
Horse Power	1/3
Length	26.50 in.
Width	30.75 in.
Inventory Number	PEN1603HSID
MPN	1603HSID