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WM97+ — Boiler Manual fired water boiler Expansion tank — WM97+70 and 110 Supplementary expansion tank, if required WM97+70/110 external expansion tank Figure 46 — piping, diaphragm or bladder-type systems having volumes more than 15 gallons only 1. The boiler is equipped with an internal diaphragm-type expansion tank, factory charged to 12 PSIG.