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is there any way that i can replace a trv without draining the CH system? ive heard a few bad things about using freeze spay. what do you think? PD :twisted:

hi there, can you help? we have been removing rads to plaster all of the walls. we currently have 1 still off Last night, hot water went. I went to the bolier and pressure was on zero. so i opened the filling loop slightly. only opened for about 5 seconds.....pressure just kept rising. was...