This estimate is to perform service work on the boiler. I will be quoting the replacement of a air vent, cleaning of the air separator, and to flush the system and fill with the proper mixture of glycol (heat transfer fluid). By having glycol in the system it will have better heat transfer than water, it will clean the build up on the piping, and prevent freezing of the lines. Per customers request I will perform this service work at the same time as the install.