To convert from oil/gas to a heat pump – do we have to change our radiators?
Most of the time no, as in our experience most radiator systems are over-sized in the first place. In retro-fit situations, where fitting a heat pump to an existing traditional system, you usually find that the existing radiators will work as they are now run constantly or for longer periods at a low temperature governed to change with the weather. Much smarter than simply running the same temperature on a time-clock every day.