--- title: Patterson-Kelley Solutions Blog | Variable Primary Piping description: Variable Primary Piping | Patterson-Kelley Blog - insights, opinions and news relating to the world of hot water heating solutions --- [![](https://info.pattersonkelley.com/hs-fs/hubfs/SPX%20-%20PK%20Logo%20Long.png?width=2124&height=225&name=SPX%20-%20PK%20Logo%20Long.png)](http://www.pattersonkelley.com) - [Solutions Blog](https://info.harscopk.com/blog) # Patterson-Kelley Solutions Blog ## [Understanding Commercial Condensing vs. Non-Condensing Appliances](https://info.pattersonkelley.com/blog/commercial-condensing-vs.-non-condensing-appliances) \[fa icon="calendar'\] Feb 17, 2025, 11:00:00 AM / by [Patterson-Kelley](https://info.pattersonkelley.com/blog/author/patterson-kelley) posted in [Variable Primary Piping](https://info.pattersonkelley.com/blog/topic/variable-primary-piping), [Primary-Secondary Piping](https://info.pattersonkelley.com/blog/topic/primary-secondary-piping) [\[fa icon="comment"\] 0 Comments](https://info.pattersonkelley.com/blog/commercial-condensing-vs.-non-condensing-appliances#comments-listing)   [Read More \[fa icon="long-arrow-right"\]](https://info.pattersonkelley.com/blog/commercial-condensing-vs.-non-condensing-appliances) ## [Commercial Piping Practices Revisted](https://info.pattersonkelley.com/blog/commercial-piping-practices-revisted) \[fa icon="calendar'\] Jun 13, 2024, 11:49:58 AM / by [Patterson-Kelley](https://info.pattersonkelley.com/blog/author/patterson-kelley) posted in [Variable Primary Piping](https://info.pattersonkelley.com/blog/topic/variable-primary-piping), [Primary-Secondary Piping](https://info.pattersonkelley.com/blog/topic/primary-secondary-piping) [\[fa icon="comment"\] 0 Comments](https://info.pattersonkelley.com/blog/commercial-piping-practices-revisted#comments-listing) \*This blog was original posted in 2023 [Read More \[fa icon="long-arrow-right"\]](https://info.pattersonkelley.com/blog/commercial-piping-practices-revisted) ## [Commercial Piping Practices 101](https://info.pattersonkelley.com/blog/commercial-piping-practices-101) \[fa icon="calendar'\] Jun 23, 2023, 2:23:32 PM / by [Patterson-Kelley](https://info.pattersonkelley.com/blog/author/patterson-kelley) posted in [Variable Primary Piping](https://info.pattersonkelley.com/blog/topic/variable-primary-piping), [Primary-Secondary Piping](https://info.pattersonkelley.com/blog/topic/primary-secondary-piping) [\[fa icon="comment"\] 0 Comments](https://info.pattersonkelley.com/blog/commercial-piping-practices-101#comments-listing) When it comes to installing commercial boilers and water heaters, selecting the right piping method is crucial for optimal performance and energy efficiency. Various piping methods are employed to ensure proper circulation and heat distribution within the system. In this blog, we will explore different piping methods commonly used in commercial settings, offering a comparative analysis to help you make an informed decision based on your specific requirements. [Read More \[fa icon="long-arrow-right"\]](https://info.pattersonkelley.com/blog/commercial-piping-practices-101) ## [Variable Primary OR Primary-Secondary Piping](https://info.pattersonkelley.com/blog/variable-primary-or-primary-secondary-piping) \[fa icon="calendar'\] Apr 30, 2019, 1:53:10 PM / by [Patterson-Kelley](https://info.pattersonkelley.com/blog/author/patterson-kelley) posted in [Boiler](https://info.pattersonkelley.com/blog/topic/boiler), [Condensing Boilers](https://info.pattersonkelley.com/blog/topic/condensing-boilers), [Hydronic Boilers](https://info.pattersonkelley.com/blog/topic/hydronic-boilers), [Non-Condensing Boilers](https://info.pattersonkelley.com/blog/topic/non-condensing-boilers), [Variable Primary Piping](https://info.pattersonkelley.com/blog/topic/variable-primary-piping), [Primary-Secondary Piping](https://info.pattersonkelley.com/blog/topic/primary-secondary-piping) [\[fa icon="comment"\] 2 Comments](https://info.pattersonkelley.com/blog/variable-primary-or-primary-secondary-piping#comments-listing) # Hydronic Boilers Piping Arrangements Just like we would debate over sports, music, or politics, engineers have long held strong opinions about piping arrangements for hydronic heating systems.  Which is better:  Primary-Secondary or Variable Primary?  They each have their benefits, but most boiler manufacturers tend to side with Primary-Secondary.  Wouldn’t it be nice to have a different choice? 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