B35TH0x30/1P-SC-S 4x2"

This is the 30-plate B35T: SWEP designation B35TH0x30/1P-SC-S 4x2". The digit after the plate letter (H0) tracks port size and port centre distance rather than heat transfer, so on a replacement it is the field that decides whether the unit lines up with the existing pipework. Reading the string: /1P is single pass; -SC is 316/316L stainless steel plates joined with copper. The closing S is the pressure class: 31 bar at 155 C. The connection field reads 4x2". The B35T plate pack measures 393 x 243 mm (15.47 x 9.57 in) on 324 x 174 mm port centres, and by SWEP's published weight formula a 30-plate unit comes to about 16.2 kg (35.7 lb) dry. Maximum flow for the frame is 27 m3/h (118.88 GPM); that is a ceiling for the ports, not a duty point. It is not neccessary to send drawings for a like-for-like replacement - the string above carries the whole build.