Yes, Alpha boilers incorporate a built-in frost thermostat. This automatically turns on the boiler and pump if the water in the boiler falls below a temperature of 5°C, provided the electrical supply is on. This function ensures that the boiler will continue to operate until the water temperature in the system boiler reaches approximately 40°C.
This feature is particularly important if your boiler is installed in a garage or loft as will be at a greater risk of freezing.
It is important to be aware that the boiler will ignite when the frost setting is activated so you may see this reflected in your heating bill. However, without frost protection you could be risking a much larger repair bill further down the line if damage is caused.