Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The 15C-8D and 15C-9D are the two Pennco 15C sizes, both 84% AFUE with a 7-inch flue and the same 36-3/8 × 26-1/2-inch cabinet footprint. The 9D adds one burner, 37 MBH of input (299 vs 262) and about 64 lb, with water content rising from 12.7 to 14.4 gallons.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Pennco 15C-8D | Pennco 15C-9D |
|---|---|---|
| Input | 262 MBH | 299 MBH |
| Heating capacity | 221 MBH | 252 MBH |
| Net AHRI water rating | 192 MBH | 219 MBH |
| Efficiency (AFUE) | 84 % | 84 % |
| Burners | 7 count | 8 count |
| Water content | 12.7 gal | 14.4 gal |
| Approx. shipping weight | 552 lb | 616 lb |
| Flue connection | 7" | 7" |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
Both boilers are fully assembled cast-iron water boilers with insulated jackets, 30 lb ASME relief valves at 50 psi MAWP, pressure gauges and 3/4-inch drain valves, and both print 84% AFUE in the sell sheet with a 7-inch flue. The 15C-8D carries seven burners and the 15C-9D eight.
The capacity step is modest but real: 262 MBH input with 221 MBH heating capacity and 192 MBH net AHRI on the 8D, against 299/252/219 MBH on the 9D. Water content rises from 12.7 to 14.4 gallons and weight from 552 to 616 lb, while the cabinet widens from 27-1/2 to 30-3/4 inches at the same height and depth.
Both accept propane conversion kits and a central heating pump, and both are covered by the published Modupak multiple-boiler installation manual when installed in plants. Choose by the calculated load plus pickup, not by the size name.
Pennco
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.
Pennco
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.
Seven on the 15C-8D and eight on the 15C-9D per the 15C sell sheet ratings table.
Yes — both list a 7-inch flue connection in the 15C sell sheet.
Yes — the official documents page publishes a Multiple Boiler Installation Manual (Modupak) for the 15C series.
A consultation includes a heat-loss review so the size is right the first time.
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.