Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the U.S. Boiler Company ES2 ES25 and the U.S. Boiler Company ES2 ES26 belong to the U.S. Boiler Company ES2 line of non-condensing boilers. Published ratings: U.S. Boiler Company ES2 ES25 at 140 MBH input, 119 MBH heating capacity and 85% AFUE; U.S. Boiler Company ES2 ES26 at 175 MBH input, 149 MBH heating capacity and 85% AFUE. U.S. Boiler Company ES2 ES26 lists 35 MBH more input than U.S. Boiler Company ES2 ES25 (175 MBH against 140 MBH). Both list the same published AFUE of 85%. U.S. Boiler Company ES2 ES26 lists 52 lb more shipping weight than U.S. Boiler Company ES2 ES25 (405 lb against 353 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | U.S. Boiler Company ES2 ES25 | U.S. Boiler Company ES2 ES26 |
|---|---|---|
| Input | 140 MBH | 175 MBH |
| DOE heating capacity | 119 MBH | 149 MBH |
| Net AHRI water rating | 103 MBH | 130 MBH |
| Efficiency (AFUE) | 85 % | 85 % |
| 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 |
| Boiler water content | 4 gal | 5 gal |
| Approx. shipping weight | 353 lb | 405 lb |
| Dimensions (width × height × depth) | 18-1/2" × 41" × 33" | 21-1/2" × 41" × 33" |
| Venting | Chimney vented (natural draft) with integrated draft diverter | Chimney vented (natural draft) with integrated draft diverter |
| Supply/return connections | 1-1/4" supply and 1-1/4" return | 1-1/4" supply and 1-1/4" return |
| Gas valve connection | 1/2" | 1/2" |
| Control | Intelligent Hydronic Control with three-digit readout and IQ Option Panel | Intelligent Hydronic Control with three-digit readout and IQ Option Panel |
| Fuel | Natural gas or LP gas | Natural gas or LP gas |
| Vent size | 6" | 6" |
Published ratings: the U.S. Boiler Company ES2 ES25 is rated 140 MBH input, 119 MBH heating capacity and 85% AFUE; the U.S. Boiler Company ES2 ES26 is rated 175 MBH input, 149 MBH heating capacity and 85% AFUE. U.S. Boiler Company ES2 ES26 lists 35 MBH more input than U.S. Boiler Company ES2 ES25 (175 MBH against 140 MBH). Both list the same published AFUE of 85%.
U.S. Boiler Company ES2 ES26 lists 52 lb more shipping weight than U.S. Boiler Company ES2 ES25 (405 lb against 353 lb). The boiler water content differs: the U.S. Boiler Company ES2 ES25 lists 4 gal, while the U.S. Boiler Company ES2 ES26 lists 5 gal. The dimensions differs: the U.S. Boiler Company ES2 ES25 lists 18-1/2" × 41" × 33", while the U.S. Boiler Company ES2 ES26 lists 21-1/2" × 41" × 33".
Both records print the same AFUE (85%), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Chimney vented (natural draft) with integrated draft diverter) and water connections (1-1/4" supply and 1-1/4" return), per the cited sources.
U.S. Boiler Company
The U.S. Boiler Company ES2 ES25 is the mid-size ES2 with a 6-inch vent: 140 MBH input with 119 MBH DOE heating capacity and a 103 MBH net AHRI water rating at 85.0% AFUE, chimney vented in 6" on the IQ Control System.
U.S. Boiler Company
The U.S. Boiler Company ES2 ES26 is the fourth size, sharing the 6-inch vent with the ES25: 175 MBH input with 149 MBH DOE heating capacity and a 130 MBH net AHRI water rating at 85.0% AFUE, chimney vented in 6" on the IQ Control System.
The U.S. Boiler Company ES2 ES26 lists 175 MBH, against 140 MBH on the U.S. Boiler Company ES2 ES25, per the cited documentation.
Both list the same AFUE of 85%.
It ships at 405 lb against 353 lb for the U.S. Boiler Company ES2 ES25, 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.