DHW circulator pump SAN 25-35 -180MM+ 1" fittings The SAN series pumps, with three speeds and threaded fittings, are designed for the recirculation of domestic hot water, both in closed and pressurized circuits, or with an open tank, as well as in solar energy installations.Thanks to its extremely silent operation, these pumps are ideal for operation in homes.The pump body (in bronze) guarantees impeccable transport of sanitary water