> The heat pump has a coefficient of performance (COP) of three to four, which means that it produces 3 kW to 4 kW of heat for each kilowatt of power it consume

> The heat pump has a coefficient of performance (COP) of three to four, which means that it produces 3 kW to 4 kW of heat for each kilowatt of power it consumes. "We have the same efficiency as traditional heat pumps, but we have better modulation thanks to acoustic transfer" So, no advantage from an energy efficiency point of view. The ability to modulate is certainly good, but they don't provide figures. My inverter air-source heat pump can modulate in the 1-8 kW range. How much better are they? Maybe they are more efficient in the whole modulation range. I'd love to see figures. > Loyer said the heat pump can generate domestic water at up to 80 C. That could certainly be an advantage. Traditional R410, R32 based heat pump are happy up to 45 C and then they really start to feel the heat (pun intended :) ) > helium at a pressure of 30 bars I doubt that will last the stated 30 years. Gases such as hydrogen and helium are very hard to contain. Even the smallest crack or gasket problem will let it go. > Given that its core is filled with water, it works best as a water-source and geothermal heat pump Huge disadvantage IMO. Air source heat pumps are way easier and cheaper to install and service and work even in residential buildings. Most of the pumps I see installed around are air-source. They say that they can convert to air-source using a fan, but don't state what the disadvantages will be (e.g. wrt efficiency) >Equium claims that the heat pump system is completely silent, despite the use of a speaker to generate the acoustic wave. The level of noise is reportedly lower than 30 dB – the equivalent of a whisper. This could be a big advantage in residential areas. Big air source heat pumps emit a lot of noise from the compressor. > Equium is now conducting field tests for its thermos-acoustic heat pump. It expects to launch it at the end of 2023 Wold love to see some MSRP figures. Interested in early adoption in Bulgaria, Greece and the region (EU). My overall opinion is that factory made air-source heat pumps are overpriced compared to an AC unit with the same output power. That is why lots of people over here do a conversion by replacing the refrigerant-air heat exchanger with commercially available plate refrigerant-water exchangers. This however voids the warranty of the AC unit and you have to do some custom electronics to convince the AC unit that it is still and AC unit, while still providing the desired water temperature (mine works best in the 33-38C range, but my whole heating system is sized accordingly).