Designed for hydronic heating and chilled water systems Compact, lightweight, self-lubricating, direct drive design Wet rotor circulator Operates in systems up to 125 PSI and 230°F Iron pumps for closed systems, bronze/stainless steel for open systems 3250 RPM N/A in chart indicates not to operate pumps at these low head levels L86-212 through L86-215 include flanges L87-211 and L87-214 have a removable integral flow check that eliminates the need for a separate in-line flow check L87-212 has a built-in transformer, relay and priority switch for easy installation of an additional zone or indirect hot water heater