CH Flow isolation replacement on Boiler

[Brean]

Hi everyone sorry to be a pain , when replacing the isolation valve on my boiler do I have to drain the system , turn off mains water or is there a more simple way?

Many thanks

 

[Agile]

If only the CH valve then just drain to below the valve height.

You dont need to turn mains water off.

Tony

 

[123456789]

If you are talking about a combi then the F+Return not connected to mains,

Why are you changing 1 valve not both? Use the time to flush the system
re pressure vessel to 1 bar fit MagnaClean + X200

 

[BingoBongo]

and you wont have to turn the mains off when you repair the leaking magnaclean in 6 months time

 

[Brean]

Hi 123456789,

Only one is leaking, do you recommend I should do them both, I do not know how to flush the system , is it difficult?

Thanks

 

[123456789]

Yes, it is not DIY stuff better get on the Gas Safe site put you post code get someone local