# H2 versus H4 System Boundary and treatment of Secondary Pump electricity consumption as 'Heat' **URL:** \ **Category:** Heatpump\ **Tags:** heatpumpmonitor\ **Created:** [18 September 2024 08:18 UTC](https://community.openenergymonitor.org/t/h2-versus-h4-system-boundary-and-treatment-of-secondary-pump-electricity-consumption-as-heat/26722 "2024-09-18T08:18:11Z")\ **Posts on this page:** 1\ **Showing post:** 30
**Author:** ![dMb](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/dmb/32/22999_2.png) [@dMb](https://community.openenergymonitor.org/u/dMb)\ **Post date:** [21 September 2024 14:08 UTC](https://community.openenergymonitor.org/t/h2-versus-h4-system-boundary-and-treatment-of-secondary-pump-electricity-consumption-as-heat/26722/30 "2024-09-21T14:08:37Z")
After searching for the official SEPEMO publications, I’ve turned up this conference paper which has a bit more detail than I’ve seen elsewhere: [http://sepemo.ehpa.org/uploads/media/D6\_9\_7\_Zottl\_HPC4\_7.pdf](http://sepemo.ehpa.org/uploads/media/D6_9_7_Zottl_HPC4_7.pdf) (I found that link via its Semantic Scholar entry: [System boundaries for SPF calculation](https://www.semanticscholar.org/paper/System-boundaries-for-SPF-calculation-Nordman-Zottl/e86182e3fda52c634ef378dde68c71efbad60e13)) In particular, this diagram from the conference paper includes extra clarity I don’t recall seeing before: ![image](https://community.openenergymonitor.org/uploads/default/original/3X/e/8/e8850341847d348860d4c8e5d3c96787686d5f37.png) Note the Primary circulation pump is shown outside of H3 (hence also H2) and only included in H4 - along with any Secondary circulation pump(s). The “[SEPEMO D4.1, 2011]” in the figure caption is a reference to the Deliverable 4.1 report (as the original source for the figure), an output from SEPEMO-Build Work Package 4; here’s the full citation for that report: > SEPEMO D4.1, 2011: “D4.1. guideline for heat pump field measurements for hydronic systems – Version 1.0, The guideline contains information on what to measure in order to calculate SPF and about the required measurement quality”, IEE SEPEMO-Build, February 2011 The “D4.2” citation also looks interesting: > SEPEMO D4.2, 2010: “D4.2. Concept for evaluation of SPF - Version 1.0, > A defined methodology for calculation of the seasonal performance factor and a definition which devices of the system have to be included in this calculation”, deliverable in the Project IEE SEPEMO-Build, June 2010 I have however drawn a blank in finding the full text for the D4.1 & D4.2 reports. It’s clear they were originally published to the WP4 section of the www.sepemo.eu website which no longer exists but is showing up on the Internet Archive here: [Work Package 4: Development of monitoring methodology and definitions for seasonal performance - SEPEMO](https://web.archive.org/web/20111015182332/http://www.sepemo.eu/deliverables/wp4/) - but looks like they only archived the website structure, not the linked media files 🙁 If anyone happens to have a copy of those reports, or has academic or EHPA contacts that might be able to access them, it would be great to see the full detail of what SEPEMO defined. --- _[View the full topic](https://community.openenergymonitor.org/t/h2-versus-h4-system-boundary-and-treatment-of-secondary-pump-electricity-consumption-as-heat/26722)._