# High heat output number

**URL:** <https://community.openenergymonitor.org/t/high-heat-output-number/29941>\
**Category:** Getting Started\
**Tags:** vaillant-emonhp\
**Created:** [29 April 2026 20:49 UTC](https://community.openenergymonitor.org/t/high-heat-output-number/29941 "2026-04-29T20:49:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ispookie666](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/ispookie666/32/37885_2.png) [@ispookie666](https://community.openenergymonitor.org/u/ispookie666)\
**Post date:** [29 April 2026 20:49 UTC](https://community.openenergymonitor.org/t/high-heat-output-number/29941/1 "2026-04-29T20:49:46Z")

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Had the heat pump installed last week - Vaillant Arotherm + 10kw

Slowly getting the grip of the controls and fine-tuning them.

I’m tyring to understand why the Heat output is -7913 W and max is 37803 W.

PS: The flow temperature peaks are due to setting an automation to boost DHW to 55 when there is excess solar.

 ![image](https://community.openenergymonitor.org/uploads/default/original/3X/c/d/cd876919a727286fed8f8da2b42a6c2b5b1b2cc6.png)

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**Author:** ![John](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/john/32/26233_2.png) [@John](https://community.openenergymonitor.org/u/John)\
**Post date:** [29 April 2026 21:50 UTC](https://community.openenergymonitor.org/t/high-heat-output-number/29941/2 "2026-04-29T21:50:25Z")

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Try clicking on Show detail, then selecting **Show defrosts and other heat lost** - you’ll see a very brief negative heat probably when the DHW kicked over - see mine below. It’s when the return is hotter than the flow because the DHW tank is heating up the colder HP output water.

 ![Screenshot 2026-04-29 at 22.48.01](https://community.openenergymonitor.org/uploads/default/original/3X/d/d/dd2d08bcab55436c8f04826c637157b826fc824e.png)