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Burnham's PVG boilers offer a unique combination of high efficiency and value to homeowners. PVG boilers utilize either a 3 or 4-inch stainless steel vent pipe to direct the flue products out of the building. This eliminates the need to install a liner in an existing chimney - which is often a major expense when replacing an older boiler. PVG series boilers are simple to install, and require very little service and maintenance. This can save homeowners hundreds of dollars in up-front installation costs, as well as several hundred dollars a year in maintenance and tune-up's. The PVG delivers the winning combination of efficiency and durability in high-temp heating applications. Features: Rugged cast iron sectional design Power Vented Suitable for use on combustible flooring Reliable cast iron heat exchanger Step opening gas valve PVG3-PVG7 boilers are Energy Star certified with an efficiency rating of 85%