Burnham Series 2 203E
The Burnham Series 2 203E is a current cast-iron gas water boiler: 69 MBH input for 58 MBH DOE heating capacity and a 50 MBH AHRI net water rating at 84.0% AFUE, with 3 cast-iron sections, a 4" vent, a 1/2" NPT gas connection and 2 gallons of water content at 241 lb shipping.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham Series 2 203E in practice
The Series 2 203E is one of the eight current cast-iron gas water boiler sizes in U.S. Boiler Company's Series 2 line. Its submittal row prints 69 MBH input, 58 MBH DOE heating capacity and a 50 MBH AHRI net water rating (1.15 allowance) at 84.0% AFUE, with 3 sections, a 4" vent diameter, a 1/2" NPT gas connection and 2 gallons of water content.
The boiler measures 14 in. wide x 27 in. deep, ships at 241 lb (empty weight 182 lb) and is a chimney-vented atmospheric cast-iron design with a heavy-duty steel base. Input ratings apply from sea level to 2,000 ft; conversion kits are documented for LP combustion (109706-01/-02, 109729-01) and for the 2,001–5,400 ft and 5,401–10,000 ft altitude bands.
Boilers.ca records the printed row for the 203E; no official Canadian-sales statement was found, so canadianStatus stays 'unknown', and gas, combustion and venting work belongs with a licensed contractor against the Series 2e I&O manual.
Best suited to
- 69-MBH-class residential loads (58 MBH DOE heating capacity)
- Chimney-vented cast-iron replacements on the long-running Series 2 platform
- Systems needing 2 gallons of boiler water content in a 3-section casting
Applicability and support
- Model number
- 203E
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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 | 69 MBH | Input per the official Series 2 submittal ratings table (sea level to 2,000 ft; conversion kits required above). |
| Output | ||
| DOE heating capacity | 58 MBH | DOE heating capacity per the official submittal. |
| AHRI net water rating | 50 MBH | AHRI net water rating based on a piping and pickup allowance of 1.15 per the submittal. |
| Efficiency | ||
| Efficiency (AFUE) | 84 % | 84.0% AFUE per the submittal ratings table; the product page carries an 84% Efficiency badge. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Vent diameter | 4" | Vent diameter per the Series 2 dimensions table; chimney-vented atmospheric design with draft hood. |
| Physical and connections | ||
| Cast-iron sections | 3 | Number of sections per the Series 2 dimensions table. |
| Dimensions | 14 in. wide x 27 in. deep | Dimensions per the Series 2 submittal dimensions table (section count drives width). |
| Gas connection | 1/2" NPT | Gas connection per the Series 2 dimensions table. |
| Shipping weight | 241 lb | Shipping weight 241 lb (empty weight 182 lb) per the Series 2 weights table. |
| Water content | 2 gal | Water content per the Series 2 weights and volume table. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Ships for natural gas from sea level to 2,000 ft; LP and altitude conversion kits are documented in the submittal chart. |
Frequently asked questions
What are the Series 2 203E's ratings?
69 MBH input, 58 MBH DOE heating capacity and a 50 MBH AHRI net water rating at 84.0% AFUE per the official submittal.
How many sections does the 203E have?
3 cast-iron sections, with a 4" vent and a 1/2" NPT gas connection per the submittal tables.
Does the 203E need a chimney?
Yes — the Series 2 is a chimney-vented atmospheric cast-iron boiler with a draft hood; the submittal lists vent diameters by size.
Questions about the Burnham Series 2 203E?
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.
Compare and explore
- Burnham Series 2 202E vs 2 203EComparison
- Burnham Series 2 203E vs 2 204EComparison
- Burnham Series 2 202ESame series
- Burnham Series 2 204ESame series
- Burnham Series 2 205ESame series
- Burnham Series 2 206ESame series
- Burnham Series 2 207ESame series
- Burnham Series 2 208ESame series
- Burnham Series 2 209ESame series
- Series 2 series hub
- Buying guide
Sources and verification
- U.S. Boiler Company — Series 2 Cast Iron Gas Water Boiler (203E) · accessed September 9, 2026
- Series 2 Submittal Form (ratings, dimensions, weights) · accessed September 9, 2026
- Series 2e I&O Manual · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.