Specifications include, but are not limited to: PACKAGED WATER-TUBE BOILERS: A. Factory-fabricated, hot water, water-tube boiler on a skid mounted steel base including insulation, jacketing, venting, connections, and controls.: 1. Connections: Feed water inlet, fuel inlet(s), safety relief valve outlet(s), and blowdown outlet.; 2. Lifting lugs provided for rigging.; B. Pressure Vessel: Vertical copper tubes.: 1. Tubes swaged at both ends and welded into upper and lower steel headers.; 2. Inspection openings in upper and lower header.; C. Combustion Chamber: 1. Poured Refractory: 3 inch, 2700 deg F minimum.; 2. Site Glass Location: Front.; D. Casing: 1. Insulation Surrounding Pressure Vessel and Combustion Chamber: a. Two layers of fiberglass insulation separated by a steel inner casing.; 2. Flue Connection: Stainless steel.; 3. Mounting Base: Welded or bolted steel base for supporting boiler and boiler components and securing to concrete base or flooring.; E. Control Compartment Enclosure: NEMA 250, Type 1A.: 1. Manufacturer to provide boilers shall be provided with independently powered control panel to be wall mounted.; F. Burner, Forced-Draft: Natural gas or propane.; 1. Blower: Direct drive integral to burner. Adjustable, air-fuel ratio damper.: a. Motors: Comply with requirements specified in Section 23 05 13. Motor sized so as to operate in service factor range above 1.0 when operating.; 2. Gas Train: Control devices to have full modulation control. Sequencing complying with AGA for gas. Gas pressure is 2 psi to the existing boilers. Manufacturer to provide pressure reducing valves as required.; a. High and low gas pressure switches.; b. Low air pressure switches.; c. Gas vent valve.; 3. Pilot: Intermittent-electric-spark ignition with observation port. a. Manual isolation ball valve.; b. Main gas regulator.; c. Two main gas shut-off actuator valves.; G. Trim for Hot Water: 1. All power piping to devices and building services to comply with ASME B31.1.; 2. Aquastat Controllers: Operating firing rate, and high limit.; 3. Safety Relief Valve: ASME rated.