Pennco 15B-235K
The Pennco 15B-235K is the largest 15B-K size: 235 MBH input with 197 MBH heating capacity and a 171 MBH net AHRI water rating at 84% AFUE, chimney vented with a 7" flue.
Key figures
- Max input
- 235 MBH
- Max CSA output
- —
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Pennco 15B-235K in practice
The Pennco 15B-235K is a cast-iron, chimney-vented gas water boiler rated at 235 MBH input. Its row in the 15B-K sell sheet prints 197 MBH heating capacity and a 171 MBH net AHRI water rating (1.15 piping and pickup allowance) at 84% AFUE, with a 7" flue, 4.6 gallons of water content, a 27-1/2"-wide cabinet and an approximate weight of 465 lb.
The boiler has a cast-iron heat exchanger with dry-leg end sections, each water- and pressure-tested before assembly, and a low-profile draft diverter hood that reduces installation height by up to 30 inches. The removable burner tray gives quick access to change orifices for LP gas and high altitude, and the internal operating control has a digital display; a Resideo-control configuration is also documented on the official documents page. Input ratings are for sea level to 2,000 feet and reduce four percent per 1,000 feet above that.
Boilers.ca documents this size at model level from the sell sheet and links the published IOM. Gas, venting and electrical work belongs with a licensed contractor. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.
Best suited to
- 235 MBH residential heat-loss loads
- Replacement installations with an existing chimney
- Homes needing LP or high-altitude orifice changes at service time
Applicability and support
- Model number
- 15B-235K
- 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 Pennco. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 235 MBH | Input per the 15B-K sell sheet ratings table (sea level to 2,000 ft; reduce 4% per 1,000 ft above that). |
| Output | ||
| Heating capacity | 197 MBH | Heating capacity per the 15B-K sell sheet ratings table. |
| Net AHRI water rating | 171 MBH | Net AHRI water rating per the 15B-K sell sheet, based on a piping and pickup allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 84 % | 84% AFUE per the 15B-K sell sheet ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Flue diameter | 7" | Flue diameter per the 15B-K sell sheet; a low-profile draft diverter hood reduces installation height by up to 30 inches. |
| Venting | Chimney vented with low-profile draft diverter hood | The sell sheet states the low-profile draft diverter hood reduces installation height by up to 30 inches compared with taller hoods. |
| Physical and connections | ||
| Approx. shipping weight | 465 lb | Approximate weight per the 15B-K sell sheet ratings table. |
| Dimensions (width × height × depth) | 27-1/2" × 32-1/8" × 27-1/4" | 15B-K dimension values; the 15B-205K/235K depths are 27-3/4 inches per the sell sheet. |
| Water content | 4.6 gal | Water content per the 15B-K sell sheet ratings table. |
| Supply/return connections | 1-1/4" supply and return tappings | Water connection sizes per the 15B-K sell sheet; see the IOM for the full tapping schedule. |
| Gas connection | 1/2" gas inlet | Gas inlet per the 15B-K sell sheet. |
| Operating limits and other | ||
| Control | Internal operating control with digital display | Internal gas valve and Resideo-control configurations are both documented on the official documents page. |
| Fuel | Natural gas or propane | The sell sheet states 'For Natural Gas Or Propane' and describes the removable burner tray for LP gas and high-altitude orifice changes. |
Manuals
Frequently asked questions
What are the Pennco 15B-235K's ratings?
235 MBH input, 197 MBH heating capacity, a 171 MBH net AHRI water rating and 84% AFUE with a 7" flue per the 15B-K sell sheet.
Does the 15B-235K need a chimney?
Yes — the 15B-K is chimney vented with a low-profile draft diverter hood; this size lists a 7" flue diameter.
Questions about the Pennco 15B-235K?
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
- Pennco — Pennco 15B-K product page · accessed September 9, 2026
- Pennco 15B-K Sell Sheet 10-08-25 (PDF) · accessed September 9, 2026
- Pennco 15B-K IOM Rev. C (PDF) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.