I have the 11 pump for almost 2 years. Below I will share my experience both for the pump and for the company.
- When it was installed, it worked flawlessly for a year. At some point it showed an error. I contacted the company and they asked for a technician to be present to make some measurements and see what happened. Indeed, the next day the technician came and in a phone call with the service, a board was found burnt. Here I should mention that it was possibly burned from voltage fluctuations but the company sent me another one for free and my technician replaced it. Total cost 20€.
- Recently it started showing error 070. Again, contact with the company and step by step it made measurements on the central panel and the unit and identified a factory error which we solved together. The technician was absolutely patient and somehow "patriotic" that the problem had to be found and solved. And it was. Cost 0€.
- In conclusion, I give the company 5 stars because it was impeccable without its own fault.
Now, the cost for a 100sqm house with 5 people (HWC) the consumption is a total of 500-600kw with an electric stove, washing machine, dryer, etc. that a family of 5 can have. I should note that the heating is underfloor.
- Company + service 5 stars
- Space heating with underfloor (economical form)
- Pump + underfloor + thermal insulation + plastic frames 5 stars for fun.

I have installed it since 2018. It operates continuously in winter and summer. It provides a lot of warmth and coolness respectively, depending on the season. The only pause in operation is 1.5 months in spring and 1.5 months in autumn. The electricity cost before the adjustment clause was about 400 euros per winter quarter and 150 euros before and after the clause, exactly double. But still, compared to a burner and oil, there is no comparison.

I have installed it for 20 days. With 40 degrees in the water and 23 degrees during the day and 21 at night in the room. Without interruption, I think it burns 15-20 klw.
Update: After one year, in 5.5 months of continuous operation, total electricity consumption is 450 euros for both the pump and the house.

Super tool, I have it for 2 years with 24 degrees at home without interruption (important) and water in the bodies at 35-50 degrees, i.e. outside if it is 15+. I will have 35 degrees in the bodies and if it is -10 degrees, it will have 50 degrees in the bodies, this is called compensation with a good adjustment in the compensation it will be super. In 2018-2019, it burned only the pump 6200kw. I also have a night mode.

In combination with underfloor heating (water operating temperature from 28 to 36 with compensation) in a northern region of Greece (Kilkis) with a constant thermostat set at 22.5 in a 100m2 insulated (10mm) detached house, it consumed 4000kWh in 2016 and 1800kWh in the winter of 2017. From the installation year 2016 until December 2022, it has consumed 19000kWh.

I have installed the same one in a 90 square meter apartment (with thermal insulation throughout the apartment) and without heating water for the bathroom, it consumes 50 kW every day (Patras area - 50 kW measured with an electricity meter on the main panel only for the heat pump). They seem like a scam to me..... Overrated, even the service from Hitachi when we called them, they apathetically told us to contact the seller we bought it from again.....

Sincerely,