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It is also an immersion-type controller that regulates hot water circulations in most heating systems. This can be mounted directly to the boiler and at the same time provides multizone control using an extra circulator and the R845 relay to each zone.This relay has a minimum operating temperature of 130 degrees Fahrenheit and a maximum operating temperature of 240 degrees Fahrenheit at a 200PSI pressure rating. Please note that it requires a 24 Vac thermostat with a heat anticipator set at .2A. Plus it has a fixed high differential temperature type.Honeywellhas been in the industry since 1906 striving to offer the best solution for residential and commercial needs. Get yours now!