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Pennco · Series

Pennco 15C

The Pennco 15C is a large cast-iron gas water boiler sold in two sizes — 15C-8D (262 MBH input) and 15C-9D (299 MBH) — at 84% AFUE with a 7-inch flue connection, propane conversion kits available and a multiple-boiler Modupak installation manual published for multi-boiler plants.

Current seriesunknownNatural gasPropaneresidential

Series facts

Type
non-condensing
Efficiency
84% AFUE
Fuel
Propane conversion kits are available per the sell sheet options list.
Venting
Chimney vented with a 7-inch flue connection per the ratings table; the sell sheet lists a 30 lb ASME relief valve (MAWP 50 psi) and the IOM covers venting.
Models documented
2

Both 15C rows print 84% AFUE in the sell sheet ratings table.

About the 15C

The Pennco 15C is Pennco's larger gas-fired cast-iron water boiler, published on the official site under Boilers – Gas with the size list '262, 299 MBH'. The sell sheet describes a fully assembled boiler with insulated jacket, a 30 lb ASME relief valve at 50 psi MAWP, a pressure gauge and a 3/4-inch drain valve, with propane conversion kits and a central heating pump (Taco or Less Pump) listed among the options. The official documents page also publishes a Multiple Boiler Installation Manual (Modupak) for 15C plants, indicating the model's use in multi-boiler configurations.

The sell sheet ratings table prints two sizes: 15C-8D (262 MBH input, 221 MBH heating capacity, 192 MBH net AHRI, 84% AFUE, 7" flue, 7 burners, 12.7 gallons, 27-1/2" wide, 552 lb) and 15C-9D (299/252/219 MBH, 84%, 7", 8 burners, 14.4 gallons, 30-3/4" wide, 616 lb). Both rows share a 36-3/8-inch height and 26-1/2-inch depth, with net AHRI ratings based on the table's printed piping and pickup allowance note.

Boilers.ca documents both sizes at model level from the sell sheet and links the Series 3 and Series 4 IOMs plus the Modupak manual. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.

Highlights

  • Current Pennco large cast-iron gas water boiler: 15C-8D and 15C-9D
  • 84% AFUE on both rows; 262 and 299 MBH input
  • Heating capacity 221/252 MBH; net AHRI water 192/219 MBH
  • 7-inch flue connection and 30 lb ASME relief valve (MAWP 50 psi)
  • Propane conversion kits and central heating pump options
  • Modupak multiple-boiler installation manual published for 15C plants
  • Model-level pages published on Boilers.ca; sell sheet and IOMs linked here

Pennco Cast Iron Consolidated Boiler Warranty Rev. C is published on the official documents page.

Models

15C models

One canonical page per model with input, output and efficiency kept separate.

CurrentCanadian status unknown
Input
Output (max)
AFUE
84 %

The Pennco 15C-8D is the smaller 15C with seven burners: 262 MBH input with 221 MBH heating capacity and a 192 MBH net AHRI water rating at 84% AFUE, 12.7 gallons of water content and a 7-inch flue.

Natural gasPropaneHeating-only
CurrentCanadian status unknown
Input
Output (max)
AFUE
84 %

The Pennco 15C-9D is the larger 15C with eight burners: 299 MBH input with 252 MBH heating capacity and a 219 MBH net AHRI water rating at 84% AFUE, 14.4 gallons of water content and a 7-inch flue.

Natural gasPropaneHeating-only

Compare models in this series

Comparison of Pennco 15C-8D and Pennco 15C-9D
SpecificationPennco 15C-8DPennco 15C-9D
input-min
Input262 MBH299 MBH
output-max
Efficiency (AFUE)84 %84 %
turndown
vent-max-3
vent-max-2
Approx. shipping weight552 lb616 lb

Read the full comparison: Pennco 15C-8D vs 15C-9D

Error codes and alerts

15C alerts

No alerts documented for this series yet.

Manuals

Official documents

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.

See all service areas

Frequently asked questions

What sizes does the Pennco 15C come in?

Two sizes: the 15C-8D at 262 MBH input with 221 MBH heating capacity and the 15C-9D at 299/252 MBH, both 84% AFUE per the sell sheet.

Can 15C boilers be installed in multiples?

Yes — the official documents page publishes a Multiple Boiler Installation Manual (Modupak) for the 15C, alongside the single-boiler Series 3 and Series 4 IOMs.

Is propane available on the 15C?

Yes — the sell sheet lists propane conversion kits among the options.

Talk to a boiler technician

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

Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.

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