This fully condensing, duplex stainless-steel boiler is suitable for primary hydronic usage and features durable construction, latched cabinets and hand-wired electric panels with terminal blocks. Maintain optimum efficiencies and a low emissions burner with the Fulton Endura™. The accessible location of important components allows for ease of installation and service. Available in natural gas and propane models with 750, 1,000, 1,500 and 2,000 MBH input.