The Thermoflo GWS 63,000 BTU 85.3% efficient Gas Fired Water Boiler is a Energy Savings USA choice for high efficiency, low price gas boiler. We like it because of its simplicity of design and installation and Lifetime warranty against leaking. Most importantly is its high efficiency and low water content of 1.5 gallons (which means low heat loss and high recovery). This is a cast iron boiler with circulator and draft inducer. This Boiler will handle about 108 feet of hot water baseboard based on 500 btu per linear foot. If purchasing you may pick gas type at the shopping cart page (natural gas or Propane). To see more information on this boiler check out their web site at http://www.williamson-thermoflo.com
