This will be subjective, Baystar are not tied to any one manufacturer however over the past 12+ years we have come to prefer certain systems over others for a number of reasons.
EcoForest Ground source heat pumps are highly recommended as they have very good control system with good customer service, are easy to get accredited on MCS and grant schemes.
Vaillant aroTHERM plus are the latest in Air Source heat pump technology and run on the latest R290 refrigerant. So far we have found this air source equipment to be extremely efficient, reliable and have found it to have a very good control system, with a good customer service in the UK plus they are easy to get accredited on the MCS & BUS grant scheme. These Vaillant units are the latest in heat pump technology and do not lose heat output even when the outside temperature is down to -7 degrees C. It also has an impressive SCOP of 3.92.
