# Infer radiator spec and system volume using the MyHeatpump app **URL:** \ **Category:** Emoncms\ **Tags:** heatpumpmonitor\ **Created:** [16 November 2023 13:17 UTC](https://community.openenergymonitor.org/t/infer-radiator-spec-and-system-volume-using-the-myheatpump-app/24798 "2023-11-16T13:17:06Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![Timbones](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/timbones/32/20308_2.png) [@Timbones](https://community.openenergymonitor.org/u/Timbones)\ **Post date:** [16 November 2023 13:44 UTC](https://community.openenergymonitor.org/t/infer-radiator-spec-and-system-volume-using-the-myheatpump-app/24798/5 "2023-11-16T13:44:35Z")
Very interesting, Trystan. I’ve been playing with this all week and it seems to match [my system](https://heatpumpmonitor.org/system/view?id=1) quite well. I calculate I have a total radiator output of **16,655 W** , and the app gives me figures around there. Some of my radiators have fans fitted to them, and I estimate they increase output by _25%_ on those radiators, taking the total output to **18,000 W**. This morning started with 2 of the radiator fans not running (17,000W), and switched on at 6am. You can maybe see the effect they had on [this heating cycle](https://emon.cryosphere.co.uk/app/view?name=AirSourceHeatPump&readkey=bb72ba957b02fecf8fb85fb1d2868782&mode=power&start=1700106950&end=1700119570), as the flow temperatures drop in the second half when the fans turn on. ![image](https://community.openenergymonitor.org/uploads/default/original/3X/6/9/69a0dfe6a8503ebd6c415571a2c79f08d9ecf962.png) In the flat bit before 6am, **16.8 kW** @ DT50. After the fans turn on the reported size is **18 kW**. The indoor temp I’m been using is pretty coarse though; I have an alternate feed I might try that gives average house temp, see if that give better numbers. The estimated volume seems to be about 130 litres. I have no idea if that’s right. --- _[View the full topic](https://community.openenergymonitor.org/t/infer-radiator-spec-and-system-volume-using-the-myheatpump-app/24798)._