We've added Octopus Cosy and E.ON Next heat pump tariffs to HPM, the combination of smart tariffs and high performing heat pump installation can deliver cost of heat at less than 4p/kWh! 🤯🤑

We also did some real-world testing, by installing two heat meters inline on the same heat pump, after 1 month the Axioma reported COP 4.02 and the Sontex reported COP 4.00 👏

We've built a heating system test rig in our office to test heat meters! The results of the testing are detailed by
@trystanlea.bsky.social in this forum post, TLDR on average expect no more than ±0.1 COP variation 😀 community.openenergymonitor.org/t/heat-meter...