My 7 year old Navien Combi boiler's 3 way valve failed this Spring. Plumber also informed me that he sees a leak from heat exchanger, and due to installing plumber's failure to place isolation valves on the device, now (after 7 years of doing) Navien say they will not warranty the parts. Since the cost for parts and repair is in excess of $6k, I have decided to replace the boiler.
My initial reaction was to stay away from any Combi boilers, since a mere 7 years is very disappointing. However, I have a small closet and 2 plumbers advised that a gas boiler/indirect tank was not possible and recommend that I either replace the boiler with a tankless coil boiler or a combi boiler. Plumber assures me that the tankless coil (Slantfin SFC 199 Combi) will be sufficient for heating and DHW for a 1800 SQ FT HOME with three bathrooms.
On the hand, I am being advised to get a better combi boiler (IBC SFC-199 NG) with proper valves and annual maintenance, which will give me 25 years of service. I am no longer interested in Navien, but I am open to other combi boilers.
Interestingly, one plumber says he could install a mini therm and a small indirect tank in my closet. According to plumber this option will be less maintenance and 15 yr life minimum. However, it is the most expensive estimate.
Any thoughts would be greatly appreciated?
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