Installing central heating

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Does anyone know how much it would cost to install a new gas central heating system, and how many days it takes?

The house is very old and is currently not even connected to the gas!

microbore pipe is about as thick as a pencil, and is often bodgily stapled to skirting boards to avoid taking floors up.

It is a cheap method of installation in every sense.

We have 9 radiators, and had lots of holes in the floors (some were from the electrician though). They also had to fit a flue through what used to be a window, and block the hole up, where the boiler was going.