thermostatic valves

[big al]

having only recently completed C&G level 2, i have been asked to replace 6 valves on rads to thermostatic type. If i bung feed and expansion tank i know i can work on the system without having to drain it all one at a time. My query is wether i have to fill each rad seperatley and bleed it or can i change all valves and bleed them all after?

 

[uug197h]

if i was changing 6 rad valves i would empty the system

 

[ProffesorPlumb]

Plug the cistern (water conservation - water regs )

Drain from the lowest point and crack on. Remember to add your inhibitor when refilling

 

[big al]

ok thanks

Thank you for your help

 

[fuzzy]

yep, save time full drain and swap em all

 

[james]

Same here, drain it..