Having some experience in the field of Heat Pumps since 2009 and having installed in many types of pumps, I present my impressions for the new MIDEA.
1. The build quality, if not excellent, is definitely very good and everything is well-made (boards, sensors, controller, and even an integrated floor base is provided).
2. The price is definitely one of the best value-for-money options available in the Greek market.
3. The technical support from the dealership-importer is of a very good level and they provide information about everything.
5. Spare parts are available (after all, it is also the best seller in the market).
6. The electrical connection is very easy (just a power cable L-N-P and a 5*0.75 control cable, plus whatever is needed for three-way valve control for DHW).
6. The startup is an easy task (pay attention to opening the ventilation, inside the pump).
7. The controller is user-friendly and provides indications for everything, even in Greek (including flow rate, water inlet and outlet temperatures, refrigerant temperature, and device power).
I will come back regarding consumption and performance in cold weather.
P.S. It is very important to have proper sizing, which should never exceed 0.12 kW per sqm (for example, a 100 sqm house will need 8 kW, with intermediate insulation and two exposed walls, up to 12 kW for a penthouse with an exposed roof and all sides uncovered). However, these kW should be achieved at 2°C!!! In good insulation (2022), prices drop by up to 40%.
If there is autonomy in spaces (2+ thermostats), it is good for the pump to heat a buffer tank of 100-200 liters (always kept warm during idle periods) and circulate the tank (buffer) through the inverter circulator in the zones.
The most important thing is not to exceed 45'-50°C in heating in order to achieve relative economy. In well-insulated double-pipe systems, it can easily work with 40-42°C, ensuring significant savings. Let's not forget that it operates in cold weather 24/7. If you have the option to choose bodies, multiply the space losses by 2.5, for example, for a 12 sqm room with 800 kcal losses, we will need 2000 kcal bodies (in order to operate at 800 kcal at max 50°C).
Greater capital depreciation is achieved when combined in a hybrid system with an oil or gas boiler (the latter being a painful story today), and the secondary source starts below a temperature where the pump is insufficient, for example, 2°C.
