Anyone monitoring an R290 Ecodan?

Hi, I had an R290 Ecodan 6kW (with a 200l FTC7 packaged cylinder) installed at the end of August.

I’m hoping to get Level 2 monitoring installed later this year or early next year. I have a Shelly EM monitoring the power usage at the moment, I am using Phil Thomson’s Ecodan esp8266 WiFi bridge to monitor and control it via Home Assistant, which has been very useful as I don’t have a wireless FTC controller.

I’ve been quite impressed with it so far, a COP of roughly 3 (calculated from the Ecodan outputs) during some mild weather periods in the North West of Scotland (Isle of Lewis).

The Ecodan seems to overestimate consumption by about 50% compared with the Shelly data, the longer the run time, the less the consumption overestimation seems to be. If I take the Ecodan production values and the Shelly measured input the COP is closer to 4.5 on average.

The pump has barely used the immersion even with 60C legionella cycles.