United Kingdom
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You can leave the pipes there. They're not doing much. Radiators aren't much threat either, unless you trip into one.
Not really. Since the radiators operate at a substantially lower temperature, you may well have to replace them - you need larger, more efficient radiators than may be typical with gas-fired systems
Oh, using the same system, instead of switching to forced air.
... why does efficiency matter if the heat stays in the house? They're just always-warm instead of sometimes-hot, yeah?
We don't tend to use air/air heat pump systems in the UK, even for new builds, always air/water.
Because of lower water temperature output of heat pumps compared to the gas boilers they replace, usually you need to increase the size of radiators to be able to achieve a room temperature change in a reasonable time. What is being referred to as efficiently, is actually just a measure of performance of the radiator, not actual energy efficiency.