The only downside is no free money from HMG as they consider it air conditioning rather than heating. It is efficient cheap and doesn't cause anything like the disruption of a full wet ashp if your system needs lots of upgrades.
The only downside is no free money from HMG as they consider it air conditioning rather than heating. It is efficient cheap and doesn't cause anything like the disruption of a full wet ashp if your system needs lots of upgrades.