A relative had their Daikin ASHP system installed by British Gas for ~£1.5K all in, but they didn't need to replace any rads or pipework.
A lot of the self-build community buy all the bits themselves and have their systems installed by a friendly local plumber on a day rate basis, then claim the £7.5K grant via an 'MCS umbrella scheme'. Haven't read up much on how that actually works. This way, it's apparently easy to end up with a system that costs almost nothing.
A relative had their Daikin ASHP system installed by British Gas for ~£1.5K all in, but they didn't need to replace any rads or pipework.
A lot of the self-build community buy all the bits themselves and have their systems installed by a friendly local plumber on a day rate basis, then claim the £7.5K grant via an 'MCS umbrella scheme'. Haven't read up much on how that actually works. This way, it's apparently easy to end up with a system that costs almost nothing.