Burnham ES2 ES29
The Burnham ES2 ES29 tops the ES2 cast-iron line at a fixed 280 MBH input: 238 MBH DOE heating capacity and a 207 MBH net AHRI rating at 85% AFUE, with the line's largest 8" draft hood for Category I chimney venting.
Key figures
- Max input
- 280 MBH
- Max CSA output
- —
- AFUE
- 85 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham ES2 ES29 in practice
The ES29 is the largest ES2 ('Efficiency Series 2') boiler: a fixed 280 MBH input for 238 MBH DOE heating capacity and a 207 MBH net AHRI water rating at 85% AFUE (ES2 I&O ratings table, Doc 103780-11). It is a NON-condensing cast-iron boiler carrying the line's largest 8" natural-draft draft hood, vented Category I into an existing lined chimney — the chimney-replacement design U.S. Boiler markets the ES2 as.
The ES29 ships at 564 lb (484 lb empty) with 1-1/4" NPT supply/return and 3/4" NPT gas, on the IQ Boiler Control System with optional outdoor-reset/LWCO IQ cards, natural or LP gas. MAWP is 50 psi (30 psi relief shipped); supply water runs 130–220°F with a 110°F minimum return, and the family's maximum build measures 35" deep by 30-3/4" wide by 41" high. Ratings apply to 2,000 ft elevation with the manual's Appendix G covering higher sites. Size from a heat-loss calculation; a licensed contractor performs the installation.
Best suited to
- Large plants whose chimney-vented load approaches a fixed 280 MBH input
- Replacements needing an 8" draft-hood connector into an existing lined chimney
- Projects at the top of the non-modulating cast-iron ES2 catalogue
Applicability and support
- Model number
- ES29
- 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 | 280 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 | 238 MBH | Per the ES2 ratings table. |
| Net AHRI water rating | 207 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); 8" 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 | 564 lb | Shipping weight 564 lb; empty (uncrated) boiler weight 484 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 | 3/4" NPT | 3/4" NPT gas connection (ES27–ES29); ES23–ES26 use 1/2" 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 ES29's ratings?
280 MBH fixed input, 238 MBH DOE heating capacity, a 207 MBH net AHRI water rating and 85% AFUE per the ES2 ratings table.
What draft hood does the ES29 use?
An 8" draft hood — the largest in the ES2 line — for Category I natural-draft venting into an existing chimney.
How much does the ES29 weigh?
564 lb shipping weight, 484 lb empty, per the ES2 I&O manual weights and volume table.
Questions about the Burnham ES2 ES29?
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.