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Posted by Ron on December 28, 2005 at 22:10:34:
In Reply to: Re: Condensing boiler - Pros & Cons posted by GWR on December 28, 2005 at 21:25:45:
A non-condensing boiler piped with primary/secondary will not protect the boiler from thermal shock or condensation. There are two issues when it comes to condensation and shock. Too cold of water returning to the boiler or too cool of water at a high flow rate. Control the flow rate into the boiler. Primary/Secondary is better than a manifold system without a boiler bypass but not truely boiler protection. The boiler will need to be pipied with a boiler bypass to do that. A boiler bypass takes cool return water and bypasses the boiler thus blending cool return water into the hot supply. This will allow you to control the flow through the boiler and now you have boiler protection.
What type of radiation do you have in your home and how many zones? If all high temp zones primary/secondary is not required. Make it a common manifold system with a boiler bypass properly adjusted.
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