Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The CG20F and CG30F are the two smallest CG-F cast-iron gas boilers, both 84.0% AFUE in the same 14-inch-wide cabinet with a 4-inch vent. The CG30F adds 32 MBH of input and about 52 lb, and unlike the CG20F it is not restricted to installations at or below 2,000 feet.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | New Yorker CG-F CG20F | New Yorker CG-F CG30F |
|---|---|---|
| Input | 38 MBH | 70 MBH |
| DOE heating capacity | 32 MBH | 59 MBH |
| Net AHRI water rating | 28 MBH | 51 MBH |
| Efficiency (AFUE) | 84 % | 84 % |
| Vent diameter | 4" | 4" |
| Approx. shipping weight | 202 lb | 254 lb |
| Dimensions (width × height × depth) | 14" × 40" × 32" | 14" × 40" × 32" |
| 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 |
Both are chimney-vented cast-iron water boilers with the integrated boiler control, thermal purge, integral LWCO and pump relay. Their rows both print 84.0% AFUE and a 4-inch vent: the CG20F at 38 MBH input with 32 MBH DOE heating capacity and 28 MBH net AHRI, the CG30F at 70/59/51 MBH.
The altitude note separates them in practice: the specification table states the CG20F is not for use above 2,000 feet, while the other rows are certified to 2,000 feet with a 2.5% rating decrease per 1,000 feet above that and altitude kits required above 5,400 feet.
Both share the 14-inch-wide, 40-inch-high, 32-inch-deep cabinet and 1-1/4-inch water connections; the CG30F's shipping weight is about 254 lb against the CG20F's 202 lb.
New Yorker Boiler
The New Yorker CG-F CG20F is the smallest CG-F size, not for use above 2,000 feet: 38 MBH input with 32 MBH DOE heating capacity and a 28 MBH net AHRI water rating at 84.0% AFUE, chimney vented in 4".
New Yorker Boiler
The New Yorker CG-F CG30F is the second size sharing the 14-inch cabinet and 4-inch vent: 70 MBH input with 59 MBH DOE heating capacity and a 51 MBH net AHRI water rating at 84.0% AFUE, chimney vented in 4".
The CG-F specification table states the CG20F is not for use above 2,000 feet; the larger rows are certified to 2,000 feet with a 2.5% decrease per 1,000 feet above that, and altitude kits are required above 5,400 feet.
Yes — both list a 4-inch vent diameter in the CG-F specification table.
That depends on the calculated heat loss and the connected radiation. The CG20F covers the smallest loads; the CG30F exists for loads above what the 20 delivers.
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.