Cost of new heating system

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Anyone has idea of rough cost of installing a new heating system? Looking into buying a house but it uses old warm air heating. Want to have some idea the cost of replacing the whole thing, e.g. regular wet system. It's a 4 bed detached.
Thanks

Replacing boiler and radiators in a 3 bed terrace is min 6k without pipes so l wpold think nearer 10k.

We have 1970s warm.air heating, it's cheaper, more wall space, dries clothes in a jiffy and heats the room up in about a minute.

On the downside my eyeballs can be a bit dry in winter.

£6k have a look on mr central heating for a heat pack ( boiler tank and rads ) should be circa £3k

@1ittlegreen any maintenance required?