PexUniverse has a large selection of BPHE models in 3x8, 4x12 and 5x12 plate sizes and with up to 100 plates on select models. Inlet/outlet connections are 3/4", 1" and 1-1/4" respectively. These heat exchangers are made using stainless steel plates and 99.9% pure copper for brazing. Pressure rated 437°F at up to 435 psi.