>> But even so taking out the valve guts still
>> means you need to drain down the system.
>>
...you do indeed, it just means that (under the circumstances described) you're less likely to have a leaky system when you refill.
I'm lucky in that the 3-port valve is upstairs, next to the HW cylinder. If I Isolate the radiators, I don't really have a lot of draining to do to work on the valve.
|