Today I came to Tammy and Dave’s Varsity home because they would like the under slab heating system inspected. Tammy has shown me a leak from the boiler venting she would like fixed as well. Upon diagnostic of the 10 year old heating system I found it was in fair condition. The exhaust venting is leaking condensate. This is especially dangerous because if water can leak out, so can the exhaust. The system serves an indirect water tank, and 5 zones of under slab heating. The main circulation pump is over amperage and has impeller ware that can easily be heard. The heat exchanger, burner, flame rectification and ignition systems all need to be pulled and cleaned as they are quite dirty. This effects ware and rare, efficiency, and general operation of the system. The water tank air eliminator was closed when it should be open. I have opened and tested it today. The system is low on glycol however it does not serve an external zone, and there are other sources of heat in the home. Tammy