Rads will almost certainly need replaced with bigger. If the pipework is 15mm or more you can reused it, but ASHP are all about marginal gains of economy so larger bore pipe and short runs are better.
Marginal gains are surely completely wiped out by the cost of replacing stuff, I would have thought?
@NotThamesWater started
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Rads will almost certainly need replaced with bigger. If the pipework is 15mm or more you can reused it, but ASHP are all about marginal gains of economy so larger bore pipe and short runs are better.