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Posted by Heatpro on December 06, 2005 at 09:56:14:
In Reply to: Re: results of temperature experiment and Phase III posted by Dave on December 06, 2005 at 09:21:50:
You would see more condensate coming out of the direct vent flue than usual. At those temperatures, you shouldn't have any unusual condensing in the boiler.
While having the water go to 180 when not needed most of the time is somewhat wasteful, probably not much moreso than having the Phase III demand it periodically.
Adding acidic chemicals to clean lime can mess up parts of the system. If you never had a leak in the system, evidenced by having to keep the water feed on to make up for losses (it is better to have a low-water-cutoff and keep the feed closed than to think that having make-up water to make up for leaks is a good thing), then you don't have enough lime collected to bother with; in fact, some can help against acidic corrosion.
It seems more phase III's (instead of the boiler co tank) could be set up with the boiler water sides in parallel to provide buffer tanks and the domestic sides in series to provide infinite hot water. Then the whole operation could be held to about 150F.