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ServiceMark technicians are experts in all things boiler! Our heating services are second to none. Let us warm your home up the right way, and we’ll do it efficiently. As a home’s room temperature drops below a set point on the thermostat, the thermostat control sends a signal to turn on the boiler system, which starts the following process: Zone valves are opened where applicable, and the circulating pump begins to pump heated water from the boiler to standing radiators, to baseboard radiators, and, in some cases, to a hot water coil located in the ducting.

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If the water temperature inside the boiler is below a set point on the aquastat control, the control will turn on the burner, which will heat up the boiler water until it reaches the high limit of 180 to 200 degrees (F). The circulator will continue to push the heated water out of the boiler forcing cooler water to return to the boiler to be re-heated. You can observe the water temperature and pressure on a gauge located on the front of the boiler. Temperature should not exceed 200 degrees (F), nor should the pressure be more than 30 pounds per square inch (psi). Following these best practices will help you avoid the need for boiler repair.

As water is pushed out of the boiler, it passes through an air scoop, air separator, or air purge, which removes the air that is suspended in the hot water. This helps eliminate noise in the system operation and stop air-bound radiation that can impede proper heating. An automatic water feeder will add water as needed to keep the system full, and the expansion tank will take any excess water that has expanded during the heating process. A relief valve is also present to relieve excess pressure in case of overheating or having too much water, to help avoid the frequent need for boiler repair.

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