baxi boiler and water supply turned off

[arabbadot]

My central heating is by a back boiler behind the fire.If the outside water is turned off can I still fire up the boiler.
Yes you have guessed it ...sudden extra cold snap problems.
Thanks for all help

[The Builder]

........... don't worry ....... the boiler isn't fed directly from the mains.
You'll be ok for ages :o)

[heathfield]

As Builder says, it'll be OK for a while, but don't allow your cold water tank to empty by drawing off too much water. It's possible for an overheated empty back-boiler to transfer enough heat to hidden pipework so as to create a fire risk. There's a Northern Ireland Government website that gives advice on their present water supply problems, and it advises not using a backboiler if there's no mains water. UK HSE advice is similar.

[arabbadot]

Thanks very much guys.
I will play safe and not fire up until the leak is found and sorted.Can dry out later.