Boilersupplies.com can supply your company with an aftermarket replacement heat exchanger for a Graham model that will meet all of the industry specifications such as ASME and TEMA requirements (B, C, & R) as well as our units complying with (Sections I, IV, VIII & Div. 1). Just fill out the easy form below with your name and information from your existing heat exchanger and BoilerSupplies.com can get all of the documents necessary to produce the exact same unit that you have now. Other manufacturers we carry are Bell & Gossett, Armstrong, Adamson, Alco, American Standard, A.O. Smith, Cemline, Old Dominion, Standard Exchange, Taco, Patterson Kelley, Reco, Thrush & Heat Exchanger USA.