Burnham ES2 ES26
The Burnham ES2 ES26 fires a fixed 175 MBH input for 149 MBH DOE heating capacity and a 130 MBH net AHRI rating at 85% AFUE, sharing the 6" draft hood with the ES25 in the non-condensing Category I ES2 line.
Key figures
- Max input
- 175 MBH
- Max CSA output
- —
- AFUE
- 85 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham ES2 ES26 in practice
The ES26 sits at the 175 MBH fixed-input mark of the ES2 series, printing 149 MBH DOE heating capacity and a 130 MBH net AHRI water rating at 85% AFUE (ES2 I&O ratings table, Doc 103780-11). It is a NON-condensing cast-iron boiler with a 6" natural-draft draft hood (shared with the ES25), vented Category I into an existing lined chimney.
The ES26 ships at 405 lb (332 lb empty), uses 1-1/4" NPT supply/return and 1/2" NPT gas, and runs the IQ Boiler Control System on natural or LP gas with optional outdoor-reset and LWCO IQ cards. Rated 50 psi MAWP with a 30 psi shipped relief valve, it operates at 130–220°F supply with a 110°F minimum return. Above 2,000 ft elevation the manual's Appendix G governs; sizing follows a heat-loss calculation and installation is licensed-contractor work.
Best suited to
- Larger homes whose chimney-vented load requires a fixed 175 MBH input
- Replacements matching an existing 6" chimney connector and draft hood
- Non-condensing cast-iron projects that want simple IQ-control diagnostics
Applicability and support
- Model number
- ES26
- 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 Burnham. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 175 MBH | Fixed input (no modulation) per the ES2 ratings table (Doc 103780-11); ratings apply to elevations up to 2,000 ft. |
| Output | ||
| DOE heating capacity | 149 MBH | Per the ES2 ratings table. |
| Net AHRI water rating | 130 MBH | Net AHRI water rating based on a piping and pickup allowance of 1.15, per the ES2 ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 85 % | 85% AFUE — a NON-condensing rating; the ES2 is a natural-draft cast-iron boiler, not a condensing design. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Venting | Category I natural draft — draft hood into an existing lined chimney (Type B/L gas vent); 6" draft hood | Non-condensing, natural-draft design: NOT a direct-vent or condensing boiler. Draft hood sizes per the ES2 I&O manual specifications. |
| Physical and connections | ||
| Shipping weight | 405 lb | Shipping weight 405 lb; empty (uncrated) boiler weight 332 lb, per the ES2 I&O manual weights and volume table. |
| Supply/return connections | 1-1/4" NPT | Supply and return both 1-1/4" NPT; relief valve 3/4" and drain 3/4" per the ES2 I&O manual. |
| Gas connection | 1/2" NPT | 1/2" NPT gas connection (ES23–ES26); ES27–ES29 use 3/4" NPT. |
| Electrical | ||
| Electrical | 120 VAC, 60 Hz, 1-phase, 15 A | Per the ES2 I&O manual specifications. |
| Operating limits and other | ||
| Maximum allowable working pressure (MAWP) | 50 psi | 50 psi MAWP; the boiler ships from the factory with a 30 psi safety relief valve. |
| Control | IQ Boiler Control System | IQ control with optional outdoor-reset and LWCO IQ option cards; the control flashes 'Err' + number for faults. |
Frequently asked questions
What are the ES26's ratings?
175 MBH fixed input, 149 MBH DOE heating capacity, a 130 MBH net AHRI water rating and 85% AFUE per the ES2 ratings table.
What are the ES26's connections?
1-1/4" NPT supply and return with 1/2" NPT gas; the 50 psi MAWP boiler ships with a 30 psi relief valve.
How heavy is the ES26?
405 lb shipping weight, 332 lb empty, per the ES2 I&O manual weights and volume table.
Questions about the Burnham ES2 ES26?
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
- U.S. Boiler Company — ES2 High Efficiency Gas-Fired Water Boiler product page · accessed September 8, 2026
- U.S. Boiler Company — Technical Literature (Alpine/ES2 I&O manual listings) · accessed September 8, 2026
- ES2 Gas Boiler — Installation, Operating & Service Instructions, Doc 103780-11 (PDF) · 103780-11 · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.