31/10/2026
Why the Panasonic R744 out competes the competition.
The Transcritical Advantage at High Temperatures
Standard subcritical refrigerants (like R290 in the competitors HWHP) face falling thermodynamic efficiency as the target water temperature rises toward 70°C. In contrast, Co2 (R744) operates on a transcritical gas-cooling cycle, naturally sheds heat over a wide glide, making it thermodynamically superior at heating water all the way from cold mains inlet temperatures up to 65°C without a steep penalty in COP.
If You live in a colder microclimate, experience frequent frost or single-digit mornings, want faster hot water recovery without relying on an electric booster, or want the quietest possible operation outside living spaces (37 dB for the outdoor unit vs. 44 dB for the all in one HWHP). The trade-off is a higher upfront equipment and installation cost.
The Panasonic split system uses an external outdoor unit (similar to a standard heat pump AC unit) with a larger evaporator coil and fan, allowing it to move much higher air volumes and capture low-grade ambient heat more aggressively in winter conditions.
Looking for fast payback on your investment. The Split system will provide this over the other systems, especially large households whom use more hotwater than smaller households.
