Boiler supporting plate heat exchanger is a thin rectangular narrow channel formed between each plate, heat exchange through the plate, with compact structure, easy operation and maintenance, high heat transfer efficiency. In the use of hot water boiler conditions, it is generally installed at the end of the production line for use in order to recover the steam condensate discharged from the boiler. Its value is to recover the heat of steam condensate to heat ordinary make-up water, make boiler make-up water temperature higher than normal, shorten the time required for water to reach boiling point to produce gas, and reduce the fuel consumption required for raw make-up water.