Pennco Silver 1603HSID Cast-Iron Steam Boiler, 75,000 BTU, Natural Gas

The Pennco Silver 1603HSID is a compact natural gas, cast-iron steam boiler with 75,000 BTU/h input for smaller one-pipe or two-pipe radiator systems. Its net IBR steam rating is 47,000 BTU/h, about 196 sq. ft. of EDR.

Electronic ignition, a built-in draft diverter and a factory motorized vent damper come standard, and the boiler vents through a 5 in. flue into a lined masonry chimney or an approved metal chimney as a Category I appliance. Leave roughly 5-1/2 in. above the jacket for the damper, and derate 4% per 1,000 ft once the site is higher than 2,000 ft.

Steam leaves through a 6 in. steam chest and two 2-1/2 in. NPT supply tappings, with two returns of the same size, which makes it easier to build a correct header and equalizer so the system delivers dry steam. Safety trim covers an electronic low-water cut-off, a pressuretrol, a 15 psi ASME pop safety valve, a glass water-level gauge and a steam pressure gauge. An LP conversion kit is available, and the boiler runs on 120V, 60 Hz, typically from a 15A circuit.

Highlights

• 75,000 BTU/h input with 62,000 BTU/h DOE heating capacity

• Net IBR steam rating of 47,000 BTU/h, about 196 sq. ft. EDR

• Up to 82.7% AFUE

• 5 in. flue with integral draft diverter and motorized vent damper

• Two 2-1/2 in. NPT supply and two return tappings

• Natural gas; LP conversion kit available

Specifications

In the box

• Factory motorized vent damper

• Square-head plugs for unused tappings

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.