I'm looking to heat pump that is quiet (to reduce potential neighbor grief) and is reasonably efficient and can heat at low ambient temperatures.
I was thinking something like the Zodiac PowerFirst 15D - which heats and cools (so can do low temps) but the largest model in that range has fairly lowish output (3.6kw in, 15.7 out) and I'm not confident that it would heat my 55,000L outdoor in-ground pool during the cooler months where max daytime temps are often ~10deg C (50F). Although it has an awesome decibel rating of 40dB compared to the common 50+ of most other models that I've seen. The AstralPool one is ~58dB.
Does anyone know of anything else that is comparable but has a bit higher output (I'm after something ~5kw in - ~20+ out) - single phase with sub 50dB sound? I'm struggling to find anything else that is below 50dB. Any recommendations?