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Comparison
Verdict in brief
Both the New Yorker CGS-C CGS30C and the New Yorker CGS-C CGS40C belong to the New Yorker Boiler CGS-C line of non-condensing boilers. Published ratings: New Yorker CGS-C CGS30C at 69 MBH input, 57 MBH heating capacity and 82% AFUE; New Yorker CGS-C CGS40C at 103 MBH input, 84 MBH heating capacity and 82% AFUE. New Yorker CGS-C CGS40C lists 34 MBH more input than New Yorker CGS-C CGS30C (103 MBH against 69 MBH). Both list the same published AFUE of 82%. New Yorker CGS-C CGS40C lists 70 lb more shipping weight than New Yorker CGS-C CGS30C (420 lb against 350 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | New Yorker CGS-C CGS30C | New Yorker CGS-C CGS40C |
|---|---|---|
| Input | 69 MBH | 103 MBH |
| DOE heating capacity | 57 MBH | 84 MBH |
| Efficiency (AFUE) | 82 % | 82 % |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
| Approx. ship weight | 350 lb | 420 lb |
| Venting | Chimney vented with built-in draft diverter | Chimney vented with built-in draft diverter |
| Supply/return connections | 2" supply and 2" return | 2" supply and 2" return |
| Control | Fully packaged with pressure limit, probe-type LWCO and vent damper | Fully packaged with pressure limit, probe-type LWCO and vent damper |
| Fuel | Natural gas or LP gas (conversion kit) | Natural gas or LP gas (conversion kit) |
| AHRI net steam rating | 43 MBH | 63 MBH |
| Steam square feet | 179 sq ft | 263 sq ft |
| Flue collar diameter | 4" | 5" |
Published ratings: the New Yorker CGS-C CGS30C is rated 69 MBH input, 57 MBH heating capacity and 82% AFUE; the New Yorker CGS-C CGS40C is rated 103 MBH input, 84 MBH heating capacity and 82% AFUE. New Yorker CGS-C CGS40C lists 34 MBH more input than New Yorker CGS-C CGS30C (103 MBH against 69 MBH). Both list the same published AFUE of 82%.
New Yorker CGS-C CGS40C lists 70 lb more shipping weight than New Yorker CGS-C CGS30C (420 lb against 350 lb). The flue collar diameter differs: the New Yorker CGS-C CGS30C lists 4", while the New Yorker CGS-C CGS40C lists 5".
Both records print the same AFUE (82%), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Chimney vented with built-in draft diverter) and water connections (2" supply and 2" return), per the cited sources.
New Yorker Boiler
The New Yorker CGS-C CGS30C is the smallest CGS-C steam size: 69 MBH input with 57 MBH DOE heating capacity and a 43 MBH AHRI net steam rating (179 sq ft) at 82% AFUE, chimney vented with a 4" flue collar.
New Yorker Boiler
The New Yorker CGS-C CGS40C is the second steam size with a 5-inch flue collar: 103 MBH input with 84 MBH DOE heating capacity and a 63 MBH AHRI net steam rating (263 sq ft) at 82% AFUE, chimney vented with a 5" flue collar.
The New Yorker CGS-C CGS40C lists 103 MBH, against 69 MBH on the New Yorker CGS-C CGS30C, per the cited documentation.
Both list the same AFUE of 82%.
It ships at 420 lb against 350 lb for the New Yorker CGS-C CGS30C, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.