New Yorker CGS-C CGS70C
The New Yorker CGS-C CGS70C is the first size with a 7-inch flue collar: 207 MBH input with 171 MBH DOE heating capacity and a 128 MBH AHRI net steam rating (533 sq ft) at 82.1% AFUE, chimney vented with a 7" flue collar.
Key figures
- Max input
- 207 MBH
- Max CSA output
- —
- AFUE
- 82.1 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
New Yorker CGS-C CGS70C in practice
The CGS-C CGS70C is a cast-iron gas-fired steam boiler rated at 207 MBH input. Its row in the CGS-C specification table prints 171 MBH DOE heating capacity, a 128 MBH AHRI net steam rating at a 1.333 piping and pickup allowance, 533 steam square feet and 82.1% AFUE, with a 7" flue collar and an approximate ship weight of 620 lb.
The boiler ships fully packaged with an insulated jacket, built-in draft diverter, pressure limit, 15 PSI safety valve, Honeywell gas valve, probe-type LWCO, steam pressure gauge, flame roll-out switch, blocked vent switch, vent damper and drain valve, and the optional near-boiler piping kit (P/N 850095U) is available for 3–6 section boilers. Ratings are for sea level to 2,000 feet and reduce 4% per 1,000 feet above that, and LP conversion kits are available only for installations up to 2,000 feet.
Boilers.ca documents this size at model level from the specification sheet and links the published I&O manual. Steam, gas and venting work belongs with a licensed contractor. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.
Best suited to
- 207 MBH residential steam loads
- Homes with an existing chimney
- Systems needing about 533 square feet of steam radiation
Applicability and support
- Model number
- CGS70C
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by New Yorker Boiler. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 207 MBH | Input per the CGS-C specification table (sea level to 2,000 ft; reduce 4% per 1,000 ft above that). |
| Output | ||
| DOE heating capacity | 171 MBH | DOE heating capacity per the CGS-C specification table. |
| AHRI net steam rating | 128 MBH | AHRI net steam rating per the CGS-C specification table, based on a piping and pickup allowance of 1.333. |
| Steam square feet | 533 sq ft | Steam square feet per the CGS-C specification table. |
| Efficiency | ||
| Efficiency (AFUE) | 82.1 % | AFUE per the CGS-C specification table; the page headline is 'Up to 82.2% AFUE'. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Flue collar diameter | 7" | Flue collar diameter per the CGS-C specification table; the boiler has a built-in draft diverter that fits in low spaces. |
| Venting | Chimney vented with built-in draft diverter | Built-in draft diverter fits in low spaces; vent damper and blocked vent switch standard. |
| Physical and connections | ||
| Approx. ship weight | 620 lb | Approximate ship weight per the CGS-C specification table. |
| Supply/return connections | 2" supply and 2" return | Steam connection sizes per the CGS-C specification sheet; probe-type LWCO and 15 PSI safety valve standard. |
| Operating limits and other | ||
| Control | Fully packaged with pressure limit, probe-type LWCO and vent damper | Standard features include pressure limit, 15 PSI safety valve, Honeywell gas valve, probe-type LWCO, steam pressure gauge, flame roll-out switch and drain valve. |
| Fuel | Natural gas or LP gas (conversion kit) | Gas-to-LP conversion kits are listed by model (P/N 105801-03 through 105801-08), available for installations up to 2,000 feet only. |
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the CGS-C CGS70C's ratings?
207 MBH input, 171 MBH DOE heating capacity, a 128 MBH AHRI net steam rating (533 sq ft) and 82.1% AFUE with a 7" flue collar per the CGS-C specification table.
Are steam boilers sold in water configurations?
No — the CGS-C is a steam series; New Yorker's water boilers are the CG-F (chimney vented) and PVCG-C (power vented) series.
Questions about the New Yorker CGS-C CGS70C?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- New Yorker Boiler — CGS-C Steam Series product page · accessed September 9, 2026
- CGS-C Steam Series Product Specifications (PDF) · accessed September 9, 2026
- CGS-C Installation and Operating Instructions (PDF) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.