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Posted by HeatPro on December 15, 2005 at 11:23:59:
In Reply to: Lochinvar boiler running on single stage posted by Dave on December 15, 2005 at 09:27:36:
Yes, this shows that there is no need to go to second stage. As discussed previously, a water temperature of 165F is above the testing temperature of 140F where the company would have had to publish the boiler as condensing. You would see water on the floor below the boiler as it has no condensate catch pans to divert condensate to drains.
As the zones with the coils are warm, it shows that the coils are also oversized, as they are usually specified to provide max heat output at 180F. Heat loss estimate mthods 'build in' extra for colder weather than design, as heat estimates do not include people, sun, house electrical loads and cooking.
No worry; if and when the house is not warm, after you add the tank, the house would keep up if it had to use the second stage. Don't expect to get below -6F often. The design temperature in your area is usually -10F for installers, although the nearby water generally keeps the temp above 0 F.