{"id":4933,"date":"2021-09-01T18:00:00","date_gmt":"2021-09-01T17:00:00","guid":{"rendered":"https:\/\/www.marshflattsfarm.org.uk\/wordpress\/?page_id=4933"},"modified":"2025-05-26T14:14:37","modified_gmt":"2025-05-26T13:14:37","slug":"nibe-heat-pump-curve-configuration","status":"publish","type":"page","link":"https:\/\/www.marshflattsfarm.org.uk\/wordpress\/?page_id=4933","title":{"rendered":"NIBE Heat Pump Curve Configuration"},"content":{"rendered":"\n

Background<\/h2>\n\n\n\n

All heat pumps operate more efficiently when producing lower-temperature water, so it uses less power to run them for longer, at lower temperature, in order to deliver a given amount of heat. (It’s also better for the longevity of the compressor to have fewer stop-start cycles.) The temperature of the heat pump’s output for a given external temperature can be configured by adjusting the weather compensation ‘Curve’ – which is effectively a simple model for the heat loss characteristics of the house. Houses which are more energy-efficient will tend to want a lower-gradient Curve than those which have higher losses (needing more heat).<\/p>\n\n\n\n

I’m kicking myself for not checking this sooner but the NIBE F1145 was installed with the default curve (#9) and an ‘offset’ of -3 (actually I might have changed that previously; not sure) and the house is definitely better-performing than average. The question is, what is the right<\/strong> setting for the curve?<\/p>\n\n\n\n

Introduction<\/h2>\n\n\n\n

The NIBE controller has a good display for the heating curve configuration – while it looks complex at first glance it’s actually pretty straightforward.<\/p>\n\n\n\n

My initial setting looked like this:<\/p>\n\n\n\n

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NIBE F1145 Weather Compensation Curve #9, Offset -3<\/figcaption><\/figure>\n\n\n\n

In terms of reading the display:<\/p>\n\n\n\n