Pennco Silver 15C-9D Cast Iron Hot Water Boiler, 299,000 BTU, Natural Gas

The Pennco Silver 15C-9D is a large natural gas, cast-iron hot water boiler for big homes and multi-zone hydronic systems. It pairs 299,000 BTU/h of input with a natural-draft Category I chimney vent, which makes it a straightforward choice for replacing an older atmospheric boiler.

This non-condensing model reaches 84% AFUE, with a DOE heating capacity of 252,000 BTU/h and a Net AHRI water rating of 219,000 BTU/h. A Hydrolevel Fuel Smart control with a digital display manages the circulator, provides low-water cut-off protection and lowers water temperature on light-load days to save fuel.

Because the draft diverter is integral and a motorized damper closes the vent between firing cycles, the boiler stands lower and wastes less heat to the flue, which helps where headroom is tight. Piping uses 1-1/4 in. NPT supply and return tappings, a 1/2 in. NPT gas inlet and a 7 in. flue. A propane version carries a P suffix on the model number.

Highlights

• Input of 299,000 BTU/h; rated 219,000 BTU/h Net AHRI for water

• 84% AFUE non-condensing cast-iron heat exchanger with push nipples

• Hydrolevel Fuel Smart control with digital display and built-in LWCO

• Integral draft diverter and motorized vent damper for Category I chimney venting

• 1-1/4 in. NPT supply and return, 1/2 in. NPT gas inlet, 7 in. flue

Specifications

In the box

• Hydrolevel Fuel Smart control with digital display and LWCO

• Motorized vent damper

• Insulated jacket

• Combination temperature/pressure gauge

• 3/4 in. drain valve

• 30 psi ASME relief valve

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.