New Yorker CGS-C Steam Series 70,000 BTU Steam Boiler - CGS30CNI-H

Upgrade Your Home Comfort With The New Yorker CGS-C CGS30CNI-H 70,000 BTU Cast-Iron Steam Boiler

Want classic steam heat that’s simple and dependable? The New Yorker CGS‑C CGS30CNI‑H is a compact, chimney‑vented gas steam boiler that brings proven cast‑iron durability and easy service to smaller homes and apartments. With up to 81.9% AFUE, electronic ignition, and a factory vent damper, it’s designed to cut standby losses compared with older standing‑pilot units—while delivering dry, even steam to your radiators.

• Brand: New Yorker
• MPN: CGS30CNI‑H (CGS‑C Steam Series)
• Type: Gas‑Fired Steam Boiler, Cast Iron, Category I Natural Draft (Chimney Vent)
• Fuel: Natural Gas (LP conversion kit available)
• Input (NG): 69,000 BTU/h (70,000 BTU class)
• DOE Heating Capacity: 56,000 BTU/h
• Net IBR (Steam): 42,000 BTU/h (≈ 175 sq. ft. EDR)
• AFUE: Up to 81.9%
• Ignition: Electronic (intermittent) with factory vent damper
• Venting: Built‑in draft diverter; 4" flue to a lined masonry or listed metal chimney
• Steam Supply / Return Tappings: 2" NPT (each)
• Gas Inlet: 3/4" NPT
• Electrical: 120V, 60 Hz
• Safety & Controls: Probe‑type LWCO, pressure limit control, 15 psi safety valve, blocked‑vent & rollout switches
• Dimensions (W × D × H): ~12‑3/4" × 28" × 40‑7/16"
• Warranty: 10‑Year Limited heat exchanger (residential; see terms)

Proven Cast Iron Steam Performance

The CGS‑C’s cast‑iron heat exchanger, stainless steel burners, and metal section connectors deliver long service life and steady, dry steam—ideal for one‑pipe and two‑pipe radiator systems.

Right‑Sized For Smaller Homes

With a 42,000 BTU/h Net IBR rating (about 175 sq. ft. EDR), this model is a smart match for compact homes and apartments when sized to your connected radiation. That helps radiators heat evenly without short‑cycling.

Simple, Code‑Compliant Chimney Venting

A built‑in draft diverter keeps the jacket low for tight basements, and the boiler vents to a properly lined chimney with a standard 4‑inch flue for straightforward replacements.

Fuel‑Saving Ignition & Vent Damper

The boiler’s electronic ignition fires only on a call for heat, and the factory vent damper helps reduce standby losses—key efficiency upgrades versus older standing‑pilot steam boilers.

Installer‑Friendly Near‑Boiler Piping

Large 2‑inch supply and return tappings support clean headers and equalizers for better steam quality. Standard safety controls include a low water cut‑off, pressure limit, and 15 psi safety valve.